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Article
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Magnetite (Fe3O4) nanoparticles with different reaction temperatures (TR= 40, 60 and 80°C) for the application of bio-detection have been successfully synthesized using the co-precipitation method. The average crystallite sizes of samples increased with the increase of TR and all samples showed high crystallinity with an inverse spinel cubic struct...
Article
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This work reports honey green synthesis of MgxZn1-xFe2O4 (x = 0.0–1.0) spinel nano ferrite (grain diameter: 25.3 nm- 33.4 nm) by sol–gel auto-combustion method. Thermally treated samples at 550 °C for 3 h, were characterized by x-ray diffraction, ‘XRD’ scanning-electron-microscopy-energy-dispersive-x-ray-spectroscopy ‘SEM-EDS’, Mössbauer spectrosco...
Article
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Petrographic observations combined with mineral compositional analyses constrain the phase relations of prograde metamorphosed serpentinites in the Bergell contact aureole (Italy). In a 1500 m profile perpendicular to the north-eastern edge of the Bergell intrusion, seven dehydration reactions ran to completion. Three previously undocumented reacti...
Article
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Fly and bottom ash (FABA) produced primarily from coal combustion in a coal-fired power plant consists of fine particles of the organic and inorganic mixture and trace elements. Eight FABA samples from coal-fired power plants in Java, Indonesia, had been collected for composition and rare earth element and Yttrium (REY) mode of occurrence identific...
Article
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CaO–MgO–Al2O3–SiO2–Cr2O3 diopside glass–ceramics were prepared from blast furnace slag, low-carbon ferrochromium alloy slag, and quartz sand by the melting method. The prepared glass–ceramics were characterized by differential thermal analysis (DTA), X-ray diffraction (XRD),scanning electron microscopy (SEM), energy-dispersive spectrometer (EDS), a...
Article
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The electrocatalytic activity for the oxygen evolution reac-tion in alkaline electrolyte of hexagonal spinel Co3O4 nanoparticles derived using scanning electrochemical cell microscopy (SECCM) is correlated with scanning electron microscopy and atomic force microscopy images of the droplet landing sites. A unique way to deconvolute the intrinsic cat...
Article
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Bimetallic layered double oxide (LDO) NiM (M = Cr, Fe) catalysts with nominal compositions of Ni/M = 2 or 3 were tailored from layered double hydroxides (LDH) using a coprecipitation method to investigate the effects of the trivalent metal (Cr or Fe) and the amount of Ni species on the structural, textural, reducibility, and catalytic properties fo...
Article
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In this study, the effect of Ti doping ratio on Ti/Ga co-doped ZnO (TGZ) nanopowders was investigated. TGZ nanoparticles with different Ti loadings were prepared using the sol-gel method and analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), infrared spectroscopy (FT-IR), ultraviolet-vis...
Conference Paper
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This study reports the results of a study on magnesia-chrome refractories used in the pyrometallurgy section of NICICO-Sarcheshmeh. Microstructure observation and chemical composition analysis was carried out by using SEM, X-Ray map analysis, and spectral analysis, respectively. Results indicated that, however, the amount of SiO2 and CaO were hi...
Article
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Mechanoluminescence (ML), as an optical response to deformation stimuli, shows great potential in high‐end stress sensing, ultrasonic field visualization, and multidimensional anti‐counterfeiting. However, processive practical applications in bio‐medicine are constrained by the discovery of near‐infrared (NIR) ML materials. Unlike lanthanides (Ln3+...
Article
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Magnetite and spinel thermochronological (U–Th) / He dates often display significantly dispersed values. In the present study, we investigated the contribution of analytical (and standardization) errors to this dispersion. U and Th content of magnetite (natural and synthetic) and natural Al spinel samples with U and Th concentrations between 0.02 a...
Article
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New magnetic nanocomposite sorbents were obtained by doping natural bentonite with nanosized CoFe2O4 spinel (10 and 20 wt.%). Nanocrystals of cobalt ferrite were synthesized by a citrate burning method. The structure and physical-chemical properties of the composites were characterized by XRD, XRF, TEM, BET, FTIR and Faraday balance magnetometry. D...
Article
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The extensive applications of spinel LiMn2O4 (LMO) are severely plagued by grievous capacity degradation and structural collapse, mainly ascribed to deleterious Jahn−Teller distortion and subsequent dissolution of Mn2+. Herein, highly stable LMO with atomic interlocking effect is rationally designed via engineering Al into the unoccupied 16c sites....
Article
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Auto-thermal reforming (ATR) of acetic acid (HAc) is one of the potential approaches to produce hydrogen. However, the current catalysts suffered from deactivation raised from sintering and carbon deposition. In order to address these concerns, a series of Co-Al-Ba composite oxide catalysts with different Ba dopings were synthesized by Pechini meth...
Article
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Poly(ethylene oxide) (PEO)‐based solid polymer electrolyte promises interfacial compatibility with the high‐capacity metallic anodes in all‐solid‐state batteries (ASSBs). However, the prototype construction is severely hindered by the parasitic ohmic resistance at the electrode‐electrolyte interface, insufficient ionic pathway of the high loading c...
Article
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The increasing concentrations of metallic Al or Al2O3 in secondary copper resources like electronic wastes motivate research into the slag chemistry of high-Al2O3 iron silicate slags for optimizing the industrial smelting process. In this study, the effect of Al2O3 in slag on the phase equilibria of the FeOx-SiO2-Al2O3 slag system was experimentall...
Article
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The study of structural morphology and the optical properties of nanoparticles produced by combustion methods are gaining significance due to their multifold applications. In this regard, in the present work, the strontium-doped cobalt aluminate nanoparticles were synthesized by utilizing Co1−xSrxAl2O4 (0 ≤ x ≤ 0.5) L-Alanine as a fuel in an igniti...
Article
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This study deals with the age and petrogenesis of mafic-ultramafic intrusions ranging in size from a few meters to 10 km within the Early Carboniferous high-grade gneisses of the Pulur Complex in the Eastern Pontides. The intrusions comprise dunite, wehrlite, gabbronorite, leucogabbro, anorthosite and ilmenite-bearing gabbronorite of cumulus origin...
Preprint
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Herein we report the synthesis and characterization of spinel copper gallate (CuGa2O4) nanocrystals (NCs) with an average size of 3.7 nm via a heat-up colloidal reaction. CuGa2O4 NCs have a band gap of ~2.5 eV and strong p-type character, in agreement with ab initio simulations. These novel NCs are demonstrated to be photoactive, generating a clear...
Preprint
Full-text available
Herein we report the synthesis and characterization of spinel copper gallate (CuGa2O4) nanocrystals (NCs) with an average size of 3.7 nm via a heat-up colloidal reaction. CuGa2O4 NCs have a band gap of ~2.5 eV and a strong p-type character, in agreement with ab initio simulations. These NCs are demonstrated to be photoactive, generating a reproduci...
Preprint
Full-text available
Herein we report the synthesis and characterization of spinel copper gallate (CuGa2O4) nanocrystals (NCs) with an average size of 3.7 nm via a heat-up colloidal reaction. CuGa2O4 NCs have a band gap of ~2.5 eV and a strong p-type character, in agreement with ab initio simulations. These NCs are demonstrated to be photoactive, generating a reproduci...
Article
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Thanks to the physical strength of diamonds and their relatively unreactive chemical nature, their mineral inclusions may remain exceptionally preserved from alteration processes and chemical exchanges with surrounding minerals, fluids and/or melts following diamond formation. Cr-bearing spinels are relatively common inclusions found in peridotitic...
Article
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The main goal of the present work was to synthesize a composite consisting of h-BN particles coated with a γ-Al2O3 nanolayer. A method was proposed for applying nanocrystalline γ-Al2O3 to h-BN particles using a sol–gel technique, which ensures the chemical homogeneity of the composite at the nano level. It has been determined that during crystalliz...
Article
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Organofluorophosphates (OFPs) have been reported to pose substantial health hazards due to their structural similarities to pesticides and nerve agents. Formation of OFPs in lithium ion batteries (LIBs) due to hydrolysis of the conducting salt lithium hexafluorophosphate (LiPF6) and the reaction with the organic carbonate solvents has been discusse...
Article
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We analysed the major, minor and trace elements chemistry of forty-two Cr-spinels from four Siberian kimberlites. They showed a wide range in Mg# (Mg/(Mg + Fe2+); 0.42–0.78) and Cr# (Cr/(Cr + Al); 0.32–0.92) and a common trend of increasing Cr# with decreasing Mg#. The major element classification schemes suggested that there were spinels deriving...
Article
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Spinel is potentially one of the best minerals for elastic geobarometry, but the large uncertainties in the published equation of state (EoS) of spinel prevent the application of elastic geobarometry using spinel. We have determined the EoS of MgAl2O4 from literature data on the volume, elasticity, and isobaric heat capacity by paying particular at...
Article
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In this study, CoMnO spinel was applied via atmospheric plasma spray onto 441 SS as SOEC interconnect coating. The performance of oxidation corrosion, electrical resistance, and Cr migration are evaluated. The influence rule was elucidated as the higher the plasma torch power and the thicker coating, the higher the deposition efficiency for the coa...
Preprint
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LiNi0.5Mn1.5O4 (LNMO) cathode active materials for Li-ion batteries have been investigated for over 20 years. Despite all effort, it has not been possible to transfer their favourable properties into applicable, stable battery cells. In order to make noteworthy progress, we believe that the research perspective on these spinel type materials has to...
Article
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In the first article, we have reported petrological data for a new, glass-bearing orthopyroxenite vein cutting a sub-arc mantle xenolith from Kamchatka. As similar veins from the West Bismarck arc, this orthopyroxenite is sulfide-rich and formed by cooling of parental melts derived by partial melting of spinel harzburgite sources. Here, I report ne...
Article
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Development in high-rate electrode materials capable of storing vast amounts of charge in a short duration to decrease charging time and increase power in lithium-ion batteries is an important challenge to address. Here, we introduce a synthesis strategy with a series of composition-controlled NMC cathodes, including LiNi0.2Mn0.6Co0.2O2(NMC262), Li...
Article
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In this work, a series of CuCo2O4-x (x = N, A and C) catalysts were synthesized using different metal salt precursors by urea hydrothermal method for catalytic soot combustion. The effect of CuCo2O4-x catalysts on soot conversion and CO2 selectivity in both loose and tight contact mode was investigated. The CuCo2O4-N catalyst exhibited outstanding...
Article
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The interaction mechanism between the reacting species and the active site of α-Fe2 O3 -based photoanodes in photoelectrochemical methanol conversion reaction is still ambiguous. Herein, we demonstrate a simple two-step strategy to fabricate a porous α-Fe2 O3 /CoFe2 O4 heterojunction for the methanol conversion reaction. The influence of the electr...
Article
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We investigated the structural and electronic energy configurations of the spinel oxide ZnGa2O4 lattice according to the crystal-phase fractions originating from substituted Eu atoms. Rietveld refinements were employed to determine the crystal structure of Eu-doped ZnGa2O4. Rietveld refinements were based on assumption of simultaneously formed thre...
Article
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IODP Expedition 357 drilled 17 shallow sites scattered over ~ 10 km in the west to east spreading direction across the Atlantis Massif oceanic core complex (OCC, MAR, 30 ºN). Mantle exposed in the footwall of the Atlantic Massif OCC is nearly wholly serpentinized (80–100%) harzburgite and subordinate dunite. A recent whole-rock chemistry study by W...
Article
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The Luna 20 mission returned samples from the Hilly and Furrowed Terrain of the Moon that is associated with the impact event that formed the Crisium Basin. This event potentially excavated deep crustal and upper mantle lithologies. Spinel is commonly considered to be a mineralogical indicator of rocks of high‐pressure origin, and orbital data indi...
Article
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The capacity fade during the cycling of lithium batteries is a key factor limiting further progress in the improvement of electric vehicles, wearable electronic devices, alternative energy sources, etc. One of the main reasons for capacity loss is battery cathode degradation, which significantly influences the battery lifetime. Despite in-depth kno...
Article
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In the present work, Al³⁺-Gd³⁺ substituted (at iron site) cubic nickel ferrite nanoparticles having the formula NiFe2-2xAlxGdxO4 (x = 0.00–0.08 in the step of 0.02) were fabricated through wet chemical, low temperature sol–gel self-ignition method. Glycine (C2H5NO2) was used as a fuel; maintaining the metal nitrite to glycine ratio as 1:4.4. The as...
Article
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From an environmental and economic point of view, we focused on the preparation of simple catalysts with many advantages such as simple isolation, easy preparation, high stability, and well catalytic activity. Here, we prepared MCM-41-coated NiFe2O4 magnetic nanoparticles and modified their surface with phosphotungstic acid (PWA) and then sulfate....
Article
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The present paper reports on MnCoFeO4 spinels with peculiar composition and their catalytic behavior in the reactions of complete oxidation of hydrocarbons. The samples were synthesized by solution combustion method with sucrose and citric acid as fuels. All samples were characterized by powder X-ray diffraction, N2-physisorption, scanning electron...
Article
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This article focuses on the physical properties of MgFe2Z4 (Z = S, Se) investigated by employing density functional theory calculations. To explore the magnetic and electronic properties, WIEN2k code was executed whereas thermoelectric properties were studied using the BoltzTraP. Studied material illustrated half-metallic nature upon employing the...
Article
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To obtain highly homogeneous cobalt–nickel aluminate spinels with small crystallite sizes, CoNiAl alloy thin films were primarily deposited using Laser-induced Thermionic Vacuum Arc (LTVA) as a versatile method for performing processing of multiple materials, such as alloy/composite thin films, at a nanometric scale. Following thermal annealing in...
Article
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As one of the most potential positive materials for cobalt-free lithium ion batteries, the lithium manganate cathode materials are extremely attractive because of their low-cost and low toxicity compared to other cathode materials, but they still suffer from the serious capacity fading because of the transition metal dissolution (Mn). Herein, a lay...
Article
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A novel pyrometallurgical process for the recovery of silicon, aluminum and silver from the silicon solar cell was developed. The aim of this work was to produce forsterite (Mg 2 SiO 4) and magnesium aluminate spinel (MgAl 2 O 4), and extract silver by calcination of the silicon solar cell with bischofite (MgCl 2 .6H 2 O). Isothermal and non-isothe...
Article
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In this study, spinel zinc chromite nanorods (ZnCr2O4 NRs) were successfully manipulated by a simple sol-gel auto combustion process employing urea as fuel. The sample was only required to sinter at 500 °C for 2 h to obtain the single crystalline phase. The phase formation, crystallinity, and surface topography of synthesized ZnCr2O4 NRs were explo...
Preprint
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Lithiation dynamics in many battery cathode materials remain poorly understood, because of the difficulty in differentiating inter and intra-particle heterogeneity. In this work, operando X-ray nanodiffraction microscopy is used to directly image the structural evolution inside Li1-xMn1.5Ni0.5O4 single crystals during electrochemical delithiation....
Article
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Cobalt ferrite doped with lanthanum in low percentages was prepared using the internal combustion method. In another step, doped cobalt ferrite thin films were prepared using pulsed laser deposition. XRD and FTIR were used to study the structure and internal structure of the films and the study was expanded to include optical, magnetic, and morphol...
Article
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The current study examines the structural, surface morphology, electrical, optical, and magnetic properties of [Co(1-x)Scx][Cr2][O4] (x = 0, 0.01, 0.03, 0.05, 0.07) prepared by combustion method. XRD (X-ray diffraction) and Raman spectra were utilized to confirm phase and structural. SEM (scanning electron microscopy) micrographs were utilized for...
Article
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Cobalt ferrite (CFO) is a promising candidate for magnetostrictive applications like actuators or sensors. We have recently shown that uniaxial magnetic anisotropy can be induced in CFO by reactive sintering using spark plasma sintering (SPS), which leads to an improvement of its magnetostrictive properties. However, the origin of the anisotropy an...
Article
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Cation substitution strategy is considered to be an effective way to create defect structure in the spinel structure for improving the performance of Li-ion batteries. In this work, a series of MgMnxCo2-xO4 (x = 0, 0.5, 1, 1.5, 2) materials with Mn ions replacing Co ions were synthesized by a facile hydrothermal method. The collected X-ray diffract...