Marcus VogtFraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Dresden, Germany
Marcus Vogt
Doctor of Natural Sciences
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Introduction
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September 2011 - present
April 2011 - August 2011
October 2007 - March 2011
Publications
Publications (67)
Die vorliegende Erfindung betrifft ein flexibles, d.h. ohne Beeinträchtigung der Funktion biegbares System zur Erzeugung elektrischer Energie, eine Vorrichtung zur Abgabe elektrischer Energie umfassend eine Mehrzahl der flexiblen Systeme, ein Verfahren zur Herstellung des flexiblen Systems sowie Verwendungen hiervon.
Am Dresdner Zentrum für Wasserstofftechnologie des Fraunhofer IFAM wurde eine pastöse Substanz auf Basis von Magnesiumhydrid entwickelt, die eine gut steuerbare
Hydrolysereaktion zur bedarfsgerechten H2-Versorgung von unterschiedlichen Brennstoffzellenanwendungen ermöglicht. Die sichere und dynamische Anwendbarkeit von Powerpaste wurde und wird in...
Porous electrodes for alkaline water electrolysis were prepared by spark plasma sintering, a short-timesintering technique, in combination with a space holder method. After removal of the space holders, highly porous layers of polycrystalline Ni and of a nanocrystalline Ni-Fe alloy were obtained on a metallic
substrate. Both porosity and thickness...
Here we report on POWERPASTE, which is an ultra-high capacity hydrogen storage substance for PEM fuel cell applications invented and developed by Fraunhofer IFAM. POWERPASTE releases hydrogen on contact with water. It has a hydrogen capacity of about 10 mass-% (i.e. 10 kg POWERPASTE → 1 kg hydrogen). This is a specific energy of 1.6 kWhel/kg and an...
The reaction of magnesium hydride with water is a very promising means to generate hydrogen for fuel cell applications as MgH2 is cheap, non-toxic, has a very long shelf life as well as an extremely high hydrogen storage capacity of up to 15.3 wt.% in hydrolysis reactions. However, pure MgH2 reacts only very slowly and incompletely with water and p...
In view of alkaline water electrolysis, the activities for the hydrogen evolution reaction of nanocrystalline Fe-based electrode materials were investigated and compared with the activities of polycrystalline Fe and Ni. Electrochemical methods were used to elucidate the overpotential value, the charge transfer resistance and the double layer capaci...
[EN] The invention relates to compact and lightweight disposable accumulators for generating electric energy with extremely high energy densities (>1 kWh/kg and >k Wh/liter), which are of immense interest in many areas of application. One possibility for implementing such energy accumulators consists in using metal hydrides in hydrogen generators i...
see: DE102014211422
[DE] Die Erfindung betrifft kompakte und leichte Einwegspeicher zur Erzeugung elektrischer Energie mit extrem hohen Energiedichten (> 1 kWh/kg und > k Wh/Liter), welche für viele Anwendungsfelder von immensem Interesse sind. Eine Möglichkeit, solche Energiespeicher zu realisieren, besteht in der Verwendung von Metallhydriden in Wasserstoffgenerator...
The iron arsenide Eu3Fe2O5Fe2As2 was synthesized at 1173-1373 K in a
resistance furnace and characterized by X-ray powder diffraction with Rietveld
analysis: Sr3Fe2O5Cu2S2-type, I4/mmm, a = 406.40(1) pm, c = 2646.9(1) pm.
Layers of edge-sharing FeAs4/4 tetrahedra are separated by perovskite-like
oxide blocks. No structural transition occurs in the...
Lithium aluminum hydride (LiAlH4) is an attractive hydrogen source for fuel cell systems due to its high hydrogen storage capacity and the moderate dehydrogenation conditions. In this contribution, TiCl3- and ZrCl4-doped LiAlH4 powders are prepared and pelletized under different compaction pressures in a uniaxial press. At constant 80 °C and a hydr...
Die Erfindung betrifft kompakte und leichte Einwegspeicher zur Erzeugung elektrischer Energie mit extrem hohen Energiedichten (> 1 kWh/kg und > 1 kWh/Liter), welche für viele Anwendungsfelder von immensem Interesse sind. Eine Möglichkeit, solche Energiespeicher zu realisieren, besteht in der Verwendung von Metallhydriden in Wasserstoffgeneratoren,...
see: DE 102013211106
[DE] Die Erfindung betrifft kompakte und leichte Einwegspeicher zur Erzeugung elektrischer Energie mit extrem hohen Energiedichten (> 1 kWh/kg und > 1 kWh/Liter) welche für viele Anwendungsfelder von immensem Interesse sind. Eine Möglichkeit, solche Energiespeicher zu realisieren, besteht in der Verwendung von Metallhydriden in Wasserstoffgenerator...
Oxide dispersion strengthened (ODS) ferritic steels are usually fabricated via mechanical alloying and subsequent consolidation via hot extrusion or hot isostatic pressing. During the individual process steps, a complex evolution of the nanoparticle structure is taking place. Powders with different Y 2 O 3 contents were milled and examined by means...
[DE] Die Erfindung betrifft ein Verfahren zur Wiedergewinnung von Nd2O3 aus Ausgangsgemischen/Schrott, in denen NdFeB enthalten ist. Aufgabe der Erfindung ist es, Möglichkeiten für eine effektive Wiedergewinnung von Neodymoxid anzugeben, um aus unsortiertem Abfall/Schrott einen hohen Anteil mit verringertem Aufwand rückgewinnen zu können. Bei dem e...
Die Erfindung betrifft ein Kompositmaterial zur hydrolytischen Erzeugung von Wasserstoff, enthaltend oder bestehend aus mindestens einem erdalkalimetallhaltigen Metallhydrid sowie mindestens einem Additiv ausgewählt aus der Gruppe bestehend aus wasserlöslichen und/oder unter Säurebildung hydrolysierbaren Metallsalzen mit mindestens zweiwertigen Met...
The new title compounds are prepared by reactions of the pure metals with “Si(NH)2” in a radio-frequency furnace at 1650 °C for 12 h.
Lithium aluminum hydride (LiAlH4) is an attractive hydrogen storage material because of its comparatively high gravimetric hydrogen storage capacity. In this study, titanium tetrachloride (TiCl4), which is liquid at room temperature, was chosen as dopant because of its high catalytic efficiency regarding the dehydrogenation of LiAlH4. Three low-ene...
Die Erfindung betrifft ein Verfahren zur Wiedergewinnung von Neodym bzw. Nd2O3 aus Ausgangsgemischen/Schrott, in denen NdFeB enthalten ist. Aufgabe der Erfindung ist es, Möglichkeiten für eine effektive Wiedergewinnung von Neodym oder Neodymoxid anzugeben, um aus unsortiertem Abfall/Schrott einen hohen Anteil mit verringertem Aufwand erreichen zu k...
Verfahren zur Gewinnung des Doppelsalzes NaNd(SO4)2·H2O aus einem vorzerkleinerten Ausgangsgemisch, in dem NdFeB enthalten ist, bei dem eine Magnetscheidung und eine Feinzerkleinerung durchgeführt werden und anschließend ein hydrometallurgischer Aufschluss unter Zugabe von Schwefelsäure, bei gleichzeitiger Bestimmung des während des hydrometallurgi...
New nitridosilicates Ca(3)Sm(3)[Si(9)N(17)] and Ca(3)Yb(3)[Si(9)N(17)] were synthesized from the reactions of the pure metals (calcium and samarium/ytterbium) with silicon diimide "Si(NH)(2) " in a radio-frequency (rf) furnace at temperatures of up to 1650 °C. These isotypic compounds crystallize in the cubic space group P4(-)3m (no. 215) with latt...
We report the synthesis and crystal structures of three new superconducting
iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 (x = 0-0.15, y = 0-0.4). The
structures are stacking variants of FeAs- and slightly puckered Pt4-yAs8-layers
with square coordinated platinum separated by calcium-layers, respectively.
Arsenic atoms in the Pt4-yAs8-layers for...
We report the synthesis and crystal structures of three new
superconducting iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 (x =
0-0.15, y = 0-0.4). The structures are stacking variants of FeAs- and
slightly puckered Pt4-yAs8-layers with square coordinated platinum
separated by calcium-layers, respectively. Arsenic atoms in the
Pt4-yAs8-layers for...
Superconductivity at 33 K in Sr2VO3FeAs is completely suppressed by small amounts of V-doping in Sr2VO3[Fe0.93(+/-0.01)V0.07(+/-0.01)]As. The crystal structures and exact stoichiometries are determined by combined neutron- and x-ray powder diffraction. Sr2VO3FeAs is shown to be very sensitive to Fe/V mixing, which interferes with or even suppresses...
Homoleptic MOF structures of the formulas 2∞[Ln(Tz*) 3] and 3∞[Ln(Tz*) 3], (Tz*) - = 1,2,3-triazolate anion, C 2H 2N 3-, Ln = Gd-Lu, were obtained by the reaction of the lanthanide metals with the aromatic heterocyclic amine 1H-l,2,3-triazole. The isotypic series of compounds are real polymorphs as they have identical constitution. The 2-dimensiona...
The iron arsenide Sr2CrO3FeAs with the tetragonal Sr2GaO3CuS-type structure was synthesized and its crystal structure re-determined by neutron powder diffraction. In contrast to previous X-ray crystallographic studies, a mixed occupancy of chromium and iron was found within the FeAs4/4 layer (93±1%Fe:7±1%Cr). We suggest that the partial Cr-doping a...
The crystal structure of the superconductor FeSe0.44Te0.56 was redetermined by high-resolution X-ray single crystal diffraction at 173 K (anti-PbO-type, P4/nmm, a=3.7996(2), c=5.9895(6) A, R1=0.022, wR2=0.041, 173 F^2). Significantly different z-coordinates of tellurium and selenium at the 2c site are clearly discernible and were refined to z_Te=0....
The crystal structure of the layered iron arsenide Sr3Sc2O5Fe2As2 was determined between 300 and 10 K. The lattice parameters of the tetragonal cell decrease anisotropically according to Delta c/c : Delta a/a approximate to 4.2, which results in a slight flattening of the As-Fe-As bond angle within the FeAs layers. No indication of a structural ins...
The iron arsenide oxides Sr2CrO3FeAs and Ba2ScO3FeAs were synthesized by high temperature solid state reactions and their crystal structures determined by the X-ray powder diffraction. Their structures are tetragonal (P4/nmm; Sr2CrO3FeAs: a = 391.12(1) pm, c = 1579.05(3) pm; Ba2ScO3FeAs: a = 412.66(5) pm, c = 1680.0(2) pm, Z = 2) and isotypic to Sr...
The crystal structure of the layered iron arsenide Sr3Sc2O5Fe2As2 was determined between 300 and 10 K. The lattice parameters of the tetragonal cell decrease anisotropically according to delta(c)/c : delta(a)/a = 4.2, which results in a slight flattening of the As-Fe-As bond angle within the FeAs layers. No indication of a structural instability co...
We report the pressure and temperature dependence of the phonon density-of-states in superconducting Ca0.6Na0.4Fe2As2 (Tc=21 K) and the parent compound CaFe2As2 using inelastic neutron scattering. We observe no significant change in the phonon spectrum for Ca0.6Na0.4Fe2As2 at 295 K up to pressures of 5 kbar. The phonon spectrum for CaFe2As2 shows s...
Polycrystalline samples of underdoped (Ba1- xKx)Fe2As2 (x≤0.4) were synthesized and studied by x-ray powder diffraction, magnetic susceptibility, specific heat and 57Fe-Mößbauer spectroscopy. The structural phase transition from tetragonal to orthorhombic lattice symmetry shifts towards lower temperatures, becomes less pronounced at x=0.1–0.2 and i...
We report the pressure and temperature dependence of the phonon density-of-states in superconducting Ca0.6Na0.4Fe2As2 (T-c=21 K) and the parent compound CaFe2As2 using inelastic neutron scattering. We observe no significant change in the phonon spectrum for Ca0.6Na0.4Fe2As2 at 295 K up to pressures of 5 kbar. The phonon spectrum for CaFe2As2 shows...
We report inelastic neutron scattering measurements of the phonon density of states of superconducting Sr0.6K0.4Fe2As2 (Tc=32 K) and Ca0.6Na0.4Fe2As2 (Tc=21 K). Compared with the parent compound BaFe2As2 doping affects mainly the lower and intermediate frequency part of the vibrations. Mass effects and lattice contraction cannot solely explain thes...
We report inelastic neutron scattering measurements of the phonon density-of-states in superconducting Sr0.6K0.4Fe2As2 (Tc=30 K) and Ca0.6Na0.4Fe2As2 (Tc=18 K). Compared with the parent compound BaFe2As2 doping affects mainly the lower and intermediate frequency part of the vibrations. Mass effects and lattice contraction cannot explain these chang...
The new quaternary iron arsenide-fluoride SrFeAsF with the tetragonal ZrCuSiAs-type structure was synthesized and the crystal structure was determined by X-ray powder diffraction (P4/nmm, a = 399.30(1), c = 895.46(1) pm). SrFeAsF undergoes a structural and magnetic phase transition at 175 K, accompanied by strong anomalies in the specific heat, ele...
The structural and magnetic phase transitions of the ternary iron arsenides
SrFe2As2 and EuFe2As2 were studied by temperature-dependent x-ray powder
diffraction and 57-Fe Moessbauer spectroscopy. Both compounds crystallize in
the tetragonal ThCr2Si2-type structure at room temperature and exhibit
displacive structural transitions at 203 K (SrFe2As2)...
We report on doping dependencies of structural parameters and superconducting transition temperatures in the solid solution (Ba1-xKx)Fe2As2. As the main effect of doping on the crystal structure, we find linear decreasing As-Fe-As bond angles and Fe-Fe distances, equivalent to an elongation of the FeAs4 tetrahedra along [001]. The structural change...
The ternary iron arsenide BaFe2As2 becomes superconducting by hole doping, which was achieved by partial substitution of the barium site with potassium. We have discovered bulk superconductivity at T{c}=38 K in (Ba1-xKx)Fe2As2 with x approximately 0.4. The parent compound BaFe2As2 crystallizes in the tetragonal ThCr2Si2-type structure, which consis...
Abhangig vom Kaliumgehalt ist (Ba1−xKx)Fe2As2 supraleitend bei 3–38 K. Supraleitung tritt bereits auf, bevor die Strukturverzerrung von BaFe2As2 (x=0) durch die Dotierung unterdruckt ist (siehe Phasendiagramm; •: kritische Temperatur, ○: Phasenumwandlungstemperatur). Durch den Kaliumeinbau verringern sich die Bindungswinkel in den FeAs-Schichten, w...
A polycrystalline sample of superconducting LaFePO was prepared in a tin flux at 1123 K. The structure was determined from single-crystal data (ZrCuSiAs type, P4/nmm, a = 3.9610(1), c = 8.5158(2) angstrom, Z = 2), and the phase analysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic and becomes superconducting at 7 K after remov...
The ternary iron arsenide BaFe2As2, with the tetragonal ThCr2Si2-type structure, exhibits a spin-density-wave (SDW) anomaly at 140 K, very similar to LaFeAsO, which is the parent compound of the iron arsenide superconductors. BaFe2As2 is a poor Pauli-paramagnetic metal and undergoes a structural and magnetic phase transition at 140 K, accompanied b...
Well-shaped yellow to red transparent single crystals of the phosphide oxides REZnPO (RE = Y, La–Nd, Sm, Gd, Dy, Ho) were synthesized from the elements and ZnO in NaCl/KCl fluxes in sealed silica ampoules. Four structures (NdZnPO type, R3m) were refined from single crystal X-ray diffractometer data: a = 388.5(2), c = 3032(1) pm, wR2 = 0.0380, 360 F...
A polycrystalline sample of superconducting LaFePO was prepared in a tin flux at 1123 K. The structure was determined from single crystal data (ZrCuSiAs-type, P4/nmm, a = 3.9610(1), c = 8.5158(2) A, Z = 2) and the phase analysis was performed by the Rietveld method. LaFePO is Pauli-paramagnetic and becomes superconducting at 7 K after removing the...
Single crystals of LaNiPO were synthesized by reacting La, P and NiO at 1173 K in a tin flux under argon atmosphere. A phase analysis and crystal structure determination was carried out using X-ray powder and single crystal methods. The quaternary phosphide oxide crystallizes in the tetragonal ZrCuSiAs structure (P4/nmm, a = 404.53(1) pm, c = 810.5...
We report inelastic neutron scattering measurements of the phonon density of states of superconducting Sr0.6K0.4Fe2As2 (Tc=32 K) and Ca0.6Na0.4Fe2As2 (Tc=21 K). Compared with the parent compound BaFe2As2 doping affects mainly the lower and intermediate frequency part of the vibrations. Mass effects and lattice contraction cannot solely explain thes...
High-resolution X-ray diffraction data, in conjunction with DFT(B3LYP) quantum calculations, have been used in a QTAIM analysis of the charge density in the trimethylenemethane (TMM) complex Fe(eta(4)-C[CH(2)](3))(CO)(3). The agreement between the theoretical and experimental topological properties is excellent. Only one bond path is observed betwe...
The preparation of the mixed-metal cluster, [Fe2Os(C5H9N)2(CO)10], and its crystal structure at 100 K are reported. This complex, along with the cluster in the preceding paper, are the first structurally characterized substitution derivatives of Fe2Os(CO)12. The isonitrile ligands adopt axial positions on the osmium centre and the cluster is isostr...
The preparation of the mixed-metal cluster, [Fe2Os(C5H9N)(CO)11], and its crystal structure at 100 K are reported. This complex, along with the cluster reported in the following paper, are the first structurally characterized substitution derivatives of Fe2Os(CO)12. The isonitrile ligand adopts an axial position on the osmium centre and the cluster...
The preparation of the mixed-metal cluster, [Fe2Os(C5H9N)2(CO)10], and its crystal structure at 100 K are reported. This complex, along with the cluster in the preceding paper, are the first structurally characterized substitution derivatives of Fe2Os(CO)12. The isonitrile ligands adopt axial positions on the osmium centre and the cluster is isostr...
The preparation of the mixed- metal cluster, [ Fe2Os( C5H9N)( CO) (11)], and its crystal structure at 100 K are reported. This complex, along with the cluster reported in the following paper, are the first structurally characterized substitution derivatives of Fe2Os( CO) (12). The isonitrile ligand adopts an axial position on the osmium centre and...
The preparation of the mixed-metal cluster, [Fe2Os(C5H9N)(CO)11], and its crystal structure at 100 K are reported. This complex, along with the cluster reported in the following paper, are the first structurally characterized substitution derivatives of Fe2Os(CO)12. The isonitrile ligand adopts an axial position on the osmium centre and the cluster...
Projects
Projects (3)
Powder Metallurgy is well suited to produce Dispersion Strengthened Materials by high energy milling and pressure assisted densification of the powders. The nanometer sized particles of oxides or other componds having low solubility in the matrix increase strength at room temperature as well as at high temperatures by hindering the movement of dislocations during deformation or creep. Due to the low solubility the dispersoids show high termal stability. In this project examples are given for materials with high strenth and high electrical and thermal conductivities. DS-Titanium materials offer high biocompatibility and high strength.