Angel Muñoz

• University Carlos III de Madrid

The development of dispersion of nanoparticles in the W-1%Y$_2$O$_3$ and W-1%La$_2$O$_3$ (wt%) alloys processed by hot isostatic pressing has been investigated using small angle neutron scattering. The mode values of these centers are found at 10 and 40 nm in W-1%Y$_2$O$_3$, and 15 and 80 nm in W-1%La$_2$O$_3$. The scanning electron microscopy anal...

Cu5Cr35Fe35V20-X5, with X = Ti, Ta or W, alloys were produced by arc melting to assess their feasibility to be used as structural materials and as interlayer in cooling systems. The microstructure and mechanical properties of the materials were analyzed in as-cast and aged states. In the as-cast state the structure of the three alloys is BCC, but f...

Cu5Cr35Fe35V20Ti5, Cu10Cr35Fe35V10Ti10, Cu15Cr35Fe35V5Ti10 and Cu20Cr30Fe30V10Ti10 were produced by low-pressure arc-melting to evaluate the feasibility of developing reduced activation high entropy alloys containing copper. The materials present a dendritic microstructure and some Cu and Ti segregation in the as-cast condition, being the Cu5Cr35Fe...

This work studies the thermal stability of the microstructure and the evolution of the defects of two high-heat flux Cu-0.8 wt%Y alloys fabricated following two alternative powder metallurgy routes. One batch was produced by direct hot isostatic pressing (HIP) consolidation of Cu-0.8 wt%Y pre-alloyed atomized powders while an additional ball millin...

A new oxide dispersion strengthened Cu–0.7wt-%Cr–0.11wt-%Zr material was processed via mechanical alloying (MA) and hot isostatic pressing (HIP). A fine dispersion of yttria particles (Y2O3) was incorporated to the Cu matrix via the addition of yttrium (III) acetate tetrahydrate (C6H9O6Y·4H2O) powder (Y3ATH), which decomposed during thermomechanica...

Dispersion strengthened copper alloys have been produced following an innovative powder metallurgy route. Copper and yttrium acetate powders have been mechanically alloyed and posteriorly thermal treated at 923 K for 3 h and 15 h under a hydrogen atmosphere in order to transform the yttrium acetate into Y2O3. Subsequently, the powders were consolid...

Double perovskites containing Ir⁴⁺ were synthesised by a citrate technique, followed by an annealing treatment in air at 1100 °C. The crystal structure of the three compounds, with formula R2NiIrO6 (R= La, Pr and Nd), were determined using a combined refinement against powder neutron diffraction (NPD) and synchrotron x-ray powder diffraction (SXRPD...

Two batches of dispersion strengthened copper alloys with a nominal composition Cu-0.8 wt%Y have been obtained following different powder metallurgy routes that include sintering by hot isostatic pressing and subsequent thermomechanical treatments. One batch, named Cu-0.8Y, was produced by sintering the raw prealloyed powder. To promote the formati...

Dispersion strengthened copper alloys have been produced by following a powder metallurgy route that have consisted of milling copper and yttrium acetate powders in a planetary ball milling and subsequently sintering by hot isostatic pressing (HIP). In order to increase the degree of densification of the materials, they were subjected to a thermal...

All the magnetoelectric properties of scheelite-type DyCrO4 are characterized by temperature- and field-dependent magnetization, specific heat, permittivity, electric polarization, and neutron diffraction measurements. Upon application of a magnetic field within ±3 T, the nonpolar collinear antiferromagnetic structure leads to a large linear magnet...

Fe4Nb2O9 was recently reported to be a new magnetoelectric material with two distinct dielectric anomalies located at TN≈90K for an antiferromagnetic transition and Tstr≈77K of unknown origin, respectively. By analyzing low-temperature neutron-powder-diffraction data, here we determined its magnetic structure below TN and uncovered the origin of th...

The effect of vanadium additions on the oxidation behaviour of tungsten has been evaluated at 600 °C in dry air. Mass gain in V-containing tungsten alloys is practically the same than that of pure tungsten processed by a conventional route. The advantage of vanadium alloying arises from the suppression of periodical microcracking described during t...

Fully dense W-15 wt%CuY and W-15 wt%CuCrZr composites have been produced by a powder metallurgy route and hot isostatic pressing. The consolidated materials show homogeneous distributions of pre-alloyed CuY and CuCrZr embedded in W phase. Y-enriched particles were found inside the CuY phase. Their mechanical behavior was studied under uniaxial comp...

Dispersion strengthened Cu-1%Y (wt%) has been produced by mechanical alloying and subsequent consolidation by hot isostatic pressing (HIP). Samples of this alloy have been submitted to an equal channel angular pressing (ECAP) process and the effects on the microstructure and mechanical properties analyzed. The characteristics of the microstructure,...

We have bombarded crystalline silicon targets with a 40 keV Fe+ ion beam at different incidence angles. The resulting surfaces have been characterized by atomic force, current-sensing and magnetic force microscopies, scanning electron microscopy, and x-ray photoelectron spectroscopy. We have found that there is a threshold angle smaller than 40° fo...

In this work the cytocompatibility of pure magnesium and Mg-xHAP composites (x = 5, 10 and 15 wt%) fabricated by powder metallurgy routes has been investigated. The materials were produced from raw HAP powders with particle mean sizes of 6 μm (S-xHAP) or 25 μm (L-xHAP). The biocompatibility study has been performed for MC3T3 cells (osteoblasts/oste...

Novel members of the R2NiRuO6 family of double perovskites have been prepared via a nitrate-citrate route, followed by annealing treatments in air in the 1100-1300 °C temperature range. The crystal and magnetic structures were characterized from neutron powder diffraction (NPD) data at 300 K and 2 K. All the samples are monoclinic, P21/n space grou...

Full density Cu-1%Y and Cu-0.8%Y alloys have been produced by different powder metallurgy routes and subsequent hot isostatic pressing. Some of the alloys have been subjected to equal channel angular pressing (ECAP) via BC route up to 8 passes. ECAP deformation homogenizes and refines the microstructure up to attaining a sub-micron grain structure....

Magnesium/hydroxyapatite composites were produced by conventional extrusion and their mechanical behavior studied under uniaxial compression at room temperature. The results evidence the capability of the HA for strengthening the Mg material, lowering its microstructural anisotropy and inhibiting deformation twinning. They also reveal that the ECAP...

A new oxide LaMn3Ni2Mn2O12 was prepared by high-pressure and high-temperature synthesis methods. The compound crystallizes in an AA′3B2B′2O12-type A-site and B-site ordered quadruple perovskite structure. The charge combination is confirmed to be LaMn3+3Ni2+2Mn4+2O12 where the La and Mn3+ are 1:3 ordered at the A and A′ sites, and the Ni2+ and Mn4+...

SEM analyses of W-Ti and W-V alloys produced by a powder metallurgy route have revealed the presence of Ti or V pools with different sizes and shapes. The larger pools have sizes ranged between ~ 0.3 and several microns and are embedded between the matrix grains. The smaller Ti-rich (V-rich) particles, with sizes below ~ 0.3 μm, are spherical and t...

Commercially pure (CP) titanium has been subjected to hydrostatic extrusion at room temperature at true strains ranging from 0.70 to 3.24. Isochronal thermal treatments, from room temperature to 1200°C, have been performed and the thermal stability of the deformation-induced defects has been studied by positron annihilation spectroscopy (PAS). In n...

R2NiMnO6 (R = Tb, Ho, Er, Tm) perovskites have been prepared by soft-chemistry techniques followed by high oxygen-pressure treatments; they have been investigated by X-ray diffraction, neutron powder diffraction (NPD), and magnetic measurements. In all cases the crystal structure is defined in the monoclinic P21/n space group, with an almost comple...

Tungsten (W) and its alloys are very promising materials for producing plasma-facing components (PFCs) in the fusion power reactors of the near future, even as a structural part in them. However, whereas the properties of pure tungsten are suitable for a PFC, its structural applications are still limited due to its low toughness, ductile to brittle...

Small-angle neutron scattering experiments, along with positron lifetime measurements and transmission electron microscopy observations, were performed on samples of an oxide dispersion-strengthened (ODS) Fe12Cr alloy and its non-ODS counterpart in order to characterize their nano-sized features. The nuclear and magnetic scattering data were analys...

An ITER-grade Cu-Cr-Zr alloy was subjected to equal channel angular pressing (ECAP) at 400 degrees C via routes B-C and C, i.e. rotated 90 or 180 around the extrusion axis before subsequent passes. The microstructure of ECAP deformed samples showed shear bands confining small recrystallized grains of about similar to 0.2-1 mu m in size. The best me...

Composites consisting of tantalum fiber/powder dispersed in a nanostructured W matrix have been consolidated by spark and pulse plasma sintering as well as by hot isostatic pressing. The microstructural observations revealed that the tungsten–tantalum fiber composites consolidated by hot isostatic pressing and pulse plasma sintering presented a con...

W-2Ti and W-1TiC alloys were produced by mechanical alloying and consolidation by hot isostatic pressing. The composition and microstructural characteristics of these alloys were studied by X-ray diffraction, energy dispersion spectroscopy and scanning electron microscopy. The mechanical behavior of the consolidated alloys was characterized by micr...

Three copper base materials were fabricated following different routes: cast Cu-1 wt.%Y (C-Cu1Y) produced by vacuum induction melting, and Cu-1 wt.%Y (PM-Cu1Y) and Cu-1 wt.%Y2O3 (PM-Cu1Y2O3) both processed by a powder metallurgy route and sintering by hot isostatic pressing. PM-Cu1Y alloy was prepared by cryomilling and PM-Cu1Y2O3 by conventional m...

This study evaluates the mechanical behaviour of an Y2O3-dispersed tungsten (W) alloy and compares it to a pure W reference material. Both materials were processed via mechanical alloying (MA) and subsequent hot isostatic pressing (HIP). We performed non-standard three-point bending (TPB) tests in both an oxidising atmosphere and vacuum across a te...

Electron back-scattered diffraction and positron annihilation lifetime measurements were performed on the ferritic–martensitic 9 %Cr Eurofer steel processed by equal channel angular pressing (ECAP) at 550 °C. The orientation imaging mapping images reveal ECAP-induced changes toward a more stable texture via rotation around 〈111〉 and 〈110〉 axes. The...

Mg and Mg-HAP composites containing 5, 10 and 15wt% of hydroxyapatite have been produced following a powder metallurgy route that consists of mixing raw powders and consolidation by extrusion. The microstructure, texture, mechanical behavior and resistance to corrosion under a PBS solution have been studied. Addition of HAP increases the microhardn...

We have synthesized two new series of metastable oxides, namely REMn2O5 and RECu3Mn4O12 (RE = rare earths) under moderate pressure conditions. A novel series of ferrimagnetic oxides has been obtained by replacing Mn³⁺ by Fe³⁺ in the parent REMn2O5 compounds (RE = Y, Dy, Ho, Er, Tm, Yb). The crystal structure has been studied by neutron powder diffr...

The oxidation resistance in dry air of pure tungsten and tungsten reinforced with a dispersion of 0.6 wt.% Y2O3 nanoparticles has been evaluated between 873 and 1073 K, temperature range that divertor in fusion power plants should endure during long-term times in the case of loss of coolant accident and/or air ingress in the vessel. Both materials...

The mechanical behavior of three tungsten (W) alloys with vanadium (V) and lanthana (La2O3) additions (W-4%V, W-1%La2O3, W-4%V-1%La2O3) processed by hot isostatic pressing (HIP) have been compared with pure-W to analyze the influence of the dopants. Mechanical characterization was performed by three point bending (TPB) tests in an oxidizing air atm...

W-2V and ODSW-2V-0.5Y(2)O(3) alloys have been produced following a powder metallurgy route consisting of mechanical alloying and a subsequent high isostatic pressing HIP at 1573 K. The grain microstructure and microhardness recovery of the alloys have been studied in samples subjected to isothermal treatments in vacuum in temperature range 1073-197...

La1-xBixMn2O5 (x = 0, 0.2, 0.4, 0.6, 0.8 and 1) oxides are members of the RMn2O5 family. The entire series has been prepared in polycrystalline form by a citrate technique. The evolution of their magnetic and crystallographic structures has been investigated by neutron powder diffraction (NPD) and magnetization measurements. All the samples crystal...

ODS and non-ODS alloys with target compositions: Fe-14Cr, Fe-14Cr-0.3Y 2 O 3 , Fe-14Cr-2W-0.3Ti-0.3Y 2 O 3 and Fe-14Cr-2W-0.3Ti-0.24Y (% wt) have been produced and characterized. The blends of elemental powders were mechanically alloyed in a planetary ball mill under an atmosphere of either helium or hydrogen. The milled powder was analyzed by scan...

The objective of the Project was the fabrication at laboratory scale of nano-grain sized model ODS ferritic steels with the composition Fe-14Cr-2W-0.3Ti-0.24Y (wt %). Two batches of samples with this nominal composition were produced by mechanical alloying of elemental powders and consolidated by hot isostatic pressing (HIP). One batch was submitte...

The current magnetic confinement nuclear fusion power reactor concepts going beyond ITER are based on assumptions about the availability of materials with extreme mechanical, heat, and neutron load capacity. In Europe, the development of such structural and armour materials together with the necessary production, machining, and fabrication technolo...

The magnetic behavior of HoCoO3 and TbCoO3 has been studied from magnetic measurements and neutron diffraction experiments performed on polycrystalline samples. The magnetic measurements indicate that the Co3+ ions exhibit a low-spin electronic configuration t2g6eg0 with S = 0 below room temperature. The neutron diffraction data show that HoCoO3 an...

The microstructure, texture and mechanical behavior of the powder metallurgy Al–5 wt.%Mg–1.2 wt.%Cr alloy subjected to equal channel angular pressing (ECAP) has been investigated. The material processed by ECAP, as well as in the homogenized condition, exhibited room temperature serrated flow (SF) up to fracture. The critical stress for the serrati...

The development of a dispersion of nanoparticles in the W–1%Y 2 O 3 and W–1%La 2 O 3 (wt%) alloys processed by hot isostatic pressing have been investigated using small-angle neutron scattering. The analyses of the scattering data using the Beaucage unified approach reveal the presence of a bi-modal distribution of spher-ical scattering centers wit...

1. Production of Fe-14Cr-2W-0.3Ti-0.24Y alloy by MA+HIP 2. Microstructural characterization OM, SEM and TEM analysis 3. Mechanical characterization Vickers hardness Tensile tests

The objective of the Project was the fabrication at laboratory scale of nanograin sized model ODS ferritic steels with the composition Fe-14Cr-2W- 0.3Ti-0.3Y2O3 (wt %). Three batches of samples with this nominal composition have been produced by mechanical alloying of elemental powders, introducing the Y in the form of Y2O3, Fe5O12Y3 and pure Y. Mi...

The objective of the project has been the fabrication at laboratory scale of nano-grain sized model ODS ferritic steels. A variety of compositions has been obtained by mechanical alloying: ODS and non-ODS Fe-14Cr samples and ODS Fe-14Cr samples containing W and Ti. The Vickers hardness of the different powder samples in as-milled state has been mea...

The long-range magnetic ordering of PrMn(2)O(5) has been studied on polycrystalline samples from neutron diffraction and specific heat measurements. The onset of antiferromagnetic ordering is observed at T(N) ≈ 25 K. In the temperature interval 18 K < T < 25 K the magnetic structure is defined by the propagation vector k(1) = (1/2,0,0). Below 18 K,...

Two ODS ferritic steels with nominal compositions (wt.%): Fe-14Cr-0.3Y2O3 and Fe-14Cr-2W-0.3Ti-0.3Y2O3 have been produced by mechanical alloying and consolidation by hot isostatic pressing. The microstructure and tensile properties of these materials after being forged and heat-treated at 1123 K have been investigated to clarify the interrelation b...

Probably the most important range of materials to consider for the blanket material in the tokamak design for fusion reactors such as ITER and DEMO is the high alloy Fe9Cr oxide dispersion strengthened (ODS) ferritic steels. These steels possess exceptional thermal conductivity and low thermal expansion while being strongly resistant to void swelli...

Reduced activation ferritic Fe–14wt%Cr and Fe–14wt%Cr–0.3wt%Y2O3 alloys were produced by mechanical alloying and hot isostatic pressing followed by forging and heat treating. The alloy containing Y2O3 developed a submicron-grained structure with homogeneous dispersion of oxide nanoparticles that enhanced the tensile properties in comparison to the...

W and W–V alloys reinforced with La2O3 particles have been produced by MA and subsequent HIP at 1573K and 195MPa. The microstructure of the consolidated alloys has been characterized by scanning electron microscopy, energy dispersive spectroscopy analyses and X-ray diffraction. The mechanical properties were studied by nanoindentation measurements....

A powder metallurgy technique has been developed to produce oxide strengthened W–Ti and W–V alloys using elemental powders and nanosized powders of La2O3 or Y2O3 as starting materials. The alloys consolidated by hot isostatic pressing resulted in high-density materials having an ultrafine-grained structure and microhardness values in the range 7–13...

In response to the urgent request from the EU Fusion Program, a new facility (TechnoFusión) for research and development of fusion materials has been planned with support from the Regional Government of Madrid and the Ministry of Science and Innovation of Spain. TechnoFusión, the National Centre for Fusion Technologies, aims screening different tec...

The title compounds are prepared by solid state reactions of PbO, Ln2O3, and Sb2O3 (1.

The synthesis, crystal structure, and dielectric properties of four novel members of the family of double perovskites Pb(2)LnSbO(6) are described. The room-temperature crystal structures were refined from neutron powder diffraction (NPD) data in the monoclinic C2/c (No. 15) space group. They contain a completely ordered array of alternating LnO(6)...

The objective of the Project was the fabrication at laboratory scale of a nano-grain sized model ODS ferritic steel with the composition Fe-14Cr-0.3Y2O3 (wt %). The alloy has been produced by mechanical alloying and consolidated by hot isostatic pressing (HIP). Different thermomechanical treatments have been used to produce a nano-grained steel. Th...

Reduced activation ferritic Fe–14 wt%Cr and Fe–14 wt%Cr–0.3 wt%Y 2 O 3 alloys were produced by mechanical alloying and hot isostatic pressing followed by forging and heat treating. The alloy containing Y 2 O 3 developed a submicron-grained structure with homogeneous dispersion of oxide nanoparticles that enhanced the tensile properties in compariso...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Temperature dependent normal modes and lattice thermal expansion of Sr2B′UO6 (B′=Ni, Co) double perovskites were investigated by Raman/infrared spectroscopies and synchrotron X-ray diffraction, respectively. Monoclinic crystal structures with space group P21/n were confirmed for both compounds, with no clear structural phase transition between 10 a...

The synthesis, crystal structure, and dielectric properties of the novel double perovskite Pb(2)TmSbO(6) are described. The room-temperature crystal structure was determined by ab initio procedures from neutron powder diffraction (NPD) and synchrotron X-ray powder diffraction (SXRPD) data in the monoclinic C2/c (No. 15) space group. This double per...

We have investigated the double perovskites Ca2MSbO6 (M = Mn, Fe) that have been prepared by solid-state reaction (M = Fe) and wet chemistry procedures (M = Mn). The crystal and magnetic structures have been studied from X-ray (XRD) and neutron powder diffraction (NPD) data. Rietveld refinements show that the crystal structures are orthorhombic (sp...

We describe the preparation and characterization of a new ferrimagnetic oxide of composition TbFeMnO5. It has been prepared by a soft-chemistry procedure, involving the thermal treatment at moderate temperatures (600 °C) of citrate precursors, subsequently annealed at 900 °C under high oxygen pressure (200 bar). The crystallographic and magnetic st...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

This report concerns the activities realized for EFDA by the ESTRUMAT-CM group at the University Carlos III of Madrid to fulfil the subtask EFDA WP08-09-MAT-ODSFS. This subtask is part of the activity 3: Developing the optimised generation of ODS nano-structured and nano-grained ferritic steels.

1. Fe‐14Cr, Fe‐14Cr‐0.3Y2O3 model alloys produced by MA+HIP+TMT 2. Fe‐14Cr, Fe‐14Cr‐0.3Y2O3 model alloys produced by MA+Spark Plasma Sintering 3. Grain refinement through Equal Channel Angular Pressing: effects in EUROFER and ODS‐EUROFER.

Temperature dependent normal modes and lattice thermal expansion of Sr2B'UO6 (B' = Ni, Co) double perovskites were investigated by Raman/infrared spectroscopies and synchrotron X-ray diffraction, respectively. Monoclinic crystal structures with space group P2(1)/n were confirmed for both compounds, with no clear structural phase transition between...

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Porous hydroxyapatite and hydroxyapatite/oxide composites, with 10 wt% addition of Y2O3, ZrO2 or TiO2 have been prepared by hot isostatic pressing after pressureless sintering, and their phase composition, mechanical properties and microstructure investigated. The quantitative X-ray diffraction analyses reveal that the addition of Y2O3 inhibits the...

The crystallographic structure of DyNiO3 has been investigated at T=200, 100, and 2 K from high-resolution neutron powder diffraction (NPD) data. We show that the structure is monoclinic, space group P21/n, from the metal–insulator transition temperature at TMI=564 K down to 2 K. The Ni atoms occupy two different sites 2d (Ni1) and 2c (Ni2), whose...

The yttria dispersion effect on the oxidation resistance of titanium prepared by powder metallurgy has been evaluated between 700 and 900 °C. Yttria additions slightly increase the oxidation rate up to 800 °C and decrease it considerably at 900 °C. The multilayered rutile scale formed on pure titanium prepared by conventional techniques is replaced...

Positron annihilation experiments were performed on oxide dispersion strengthened (ODS) and non-ODS EUROFER prepared by mechanical alloying and hot isostatic pressing. The results revealed the presence of small voids in these materials in the as-HIPed conditions. Their evolution under isochronal annealing experiments was investigated. The coinciden...

Two Fe-12 wt% Cr alloys, one containing 0.4 wt% Y2O3 and the other Y2O3-free, have been produced by mechanical alloying followed by hot isostatic pressing. These oxide dispersion strengthened and reference alloys were characterized both in the as-HIPed state and after tempering by transmission electron microscopy and atom-probe tomography. The as-H...

High oxygen pressure techniques were used to prepare two ferromagnetic compounds of the series La ( Cu _3-x Mn _x) Mn ₄ O ₁₂ ( x=1 and x=2 ). In a previous work, the end member LaCu ₃ Mn ₄ O ₁₂ was reported to be cubic, space group Im 3 , showing a ferrimagnetic structure dr...

A study of the crystallographic and magnetic structure of SrCoO2.5 with a brownmillerite-type structure has been carried out from neutron powder-diffraction (NPD) measurements at temperatures ranging from 10 to 623 K, across the Néel temperature (TN=537K) of this antiferromagnetic oxide. The study has been complemented with differential scanning ca...

We describe the preparation of SeMO3 (M= Mn, Co, Ni, Zn) under high pressure conditions (3.5-7 GPa), starting from reactive SeO3H2 and MO mixtures, contained in sealed platinum capsules under the reaction conditions (850-900° C for 30-60 min). The polycrystalline samples have been studied by x-ray diffraction (XRD) or neutron powder diffraction (NP...

Yttrium oxide dispersion strengthened (ODS) and non-ODS EUROFER produced by mechanical alloying and hot isostatic pressing have been subjected to isochronal annealing up to 1523K, and the evolution of the open-volume defects and their thermal stability have been investigated using positron lifetime and coincidence Doppler broadening (CDB) technique...

Recientemente se ha comunicado una mayor tasa de fracasos de vancomicina en el tratamiento de la bacteriemia por Staphylococcus aureus meticilín-resistente (SAMR) cuando la concentración mínima inhibitoria (CMI) de ésta es ³2 mg/l. El objetivo del presente estudio es analizar si existen factores clínicos y/o epidemiológicos predictivos de aislamien...

Two small ingots of the steel EUROFER 97, one containing 0.25wt% Y2O3 and the other Y2O3 free, have been produced by consolidating mechanically milled powder by hot isostatic pressing at 1373K for 2h under 200MPa. For comparison, a third ingot was consolidated under identical conditions but using un-milled EUROFER powder. Microhardness, tensile and...

A new oxide of stoichiometry HoFeMnO5 has been obtained by replacing Mn3+ cations by Fe3+ in the parent oxide HoMn2O5. The crystallographic and magnetic structures have been analyzed by neutron powder diffraction (NPD), which complements susceptibility and magnetization measurements. HoFeMnO5 is orthorhombic, belonging to the Pbam space group like...

We have synthesized two new series of metastable oxides, namely REMn 2O5 and RECu3Mn4O12 (RE = rare earths) under moderate pressure conditions. A novel series of ferrimagnetic oxides has been obtained by replacing Mn3+ by Fe 3+ in the parent REMn2O5 compounds (RE = Y, Dy, Ho, Er, Tm, Yb). The crystal structure has been studied by neutron powder dif...

HoMnFeO5 obtained from HoMn2O5 by replacing Mn3+ by Fe3+. The study of the crystallographic structure indicates that HoMnFeO5 is orthorhombic, Pbam space group. The magnetic measurements and the neutron diffraction experiments show that HoMnFeO5 is ferrimagnetic, with TC≈153K. The Ho3+ ions seem to present a frustrated magnetic order.

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.

We describe the preparation of SeMO(3) (M = Ni, Mn) under high pressure conditions (3.5 GPa), starting from reactive H(2)SeO(3) and MO mixtures, contained in sealed gold capsules under the reaction conditions 850 degrees C for 1 h. The polycrystalline samples have been studied by neutron powder diffraction (NPD) data and magnetization measurements....

A polycrystalline sample with SrFe{sub 0.5}Co{sub 0.5}O{sub 3-δ} stoichiometry has been prepared under moderate pressures of 2GPa in the presence of KClOâ as oxidizing agent. The crystallographic and magnetic structures have been studied from neutron powder diffraction (NPD), complemented with magnetotransport and magnetic susceptibility data. The...

DOI:https://doi.org/10.1103/PhysRevB.73.149905

Y2O3-dispersed titanium with Y2O3 content ranging between 0.3 and 0.7 wt% was produced by an arc-melting technique starting from Ti and Y2O3. Compositional and microstructural characterization was performed by XRD, SEM and TEM for as-cast, forged and recrystallized samples. A uniform nanodispersion of Y2O3 particles with sizes <100 nm was found for...