A5007336688- Rare-earth and actinide compounds
- Magnetic Properties of Alloys
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Applications
- Magnetic properties of thin films
- Advanced Thermoelectric Materials and Devices
- Intermetallics and Advanced Alloy Properties
- Iron-based superconductors research
- Heusler alloys: electronic and magnetic properties
- ZnO doping and properties
- Engineering and Materials Science Studies
- Inorganic Chemistry and Materials
- Physics of Superconductivity and Magnetism
- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Gas Sensing Nanomaterials and Sensors
- Thermodynamic and Structural Properties of Metals and Alloys
- Solid-state spectroscopy and crystallography
- Boron and Carbon Nanomaterials Research
- Railway Engineering and Dynamics
- Sociology and Education Studies
- Silicone and Siloxane Chemistry
- X-ray Diffraction in Crystallography
- Economic and Social Issues
- Multiferroics and related materials
TU Wien
2012-2022
Austrian Economics Center
2016-2018
Technische Universität Braunschweig
1967-2014
European Science Foundation
2011
SOLID (Austria)
2011
University of Vienna
1990-2009
TU Dresden
1982-2009
FZI Research Center for Information Technology
2007
Institute of High Energy Physics
2004
Siemens (Germany)
1997-1998
Abstract Thin films of n‐conducting In 2 O 3 are prepared by reactive sputtering. The concentration conduction electrons is changed a heat treatment between n e = 10 17 and 20 cm −3 ( T 300°K). Concentration temperature dependence the electron mobility indicate an intense scattering at charged imperfection centres which due to considerable intrinsic lattice disorder. absorption also influenced this
Linking the fundamental physics of band structure and scattering theory with macroscopic features such as measured temperature dependencies electronic thermal transport is indispensable to a thorough understanding thermoelectric phenomena ensures more targeted efficient experimental research. Regarding ${\mathrm{Fe}}_{2}\mathrm{VAl}$-based compounds, work has seen mostly qualitative often speculative interpretations, preventing this class materials from tapping their full potential when it...
A very small capacitive sensor for measuring thermal expansion and magnetostriction of irregular shaped samples has been developed. method with tilted plates is used. The plate capacitance formula used the calculation capacitor gap, calibration performed by signal a standard material. active length sample can be less than 1 mm. absolute resolution about Å. All mechanical connections dilatometer are carried out tiny Cu–Be springs, enabling force on to adjusted (50–500 mN) no additional fixing...
The current paper gives an overview of the newly obtained thermal expansion coefficients skutterudites as well those so far available in literature. Thermal was determined for CoSb3, Pt4Sn4.4Sb7.6, As- and Ge-based various high-ZT (micro- nanostructured) with didymium (DD) mischmetal (Mm) filler atoms frameworks (Fe1−xCox)4Sb12 (Fe1−xNix)4Sb12, double triple-filled such Ca0.07Ba0.23Co3.95Ni0.05Sb12 Sr0.025Ba0.075Yb0.1Co4Sb12. For low temperatures, a capacitance dilatometer used (4–300 K),...
The effect of the volume expansion on total linear magnetostriction Fe85Ga15, Fe80Ga20, and Fe71Ga29 mold-cast bulk alloys was investigated by measuring change in length with applied field longitudinal perpendicular to temperature gradient during solidification. In magnetically saturated state, due contribution expansion, saturation for all three about 66 % magnetostriction. is strongly dependent direction gradient, being larger this direction. substitution Fe Ga atoms increases lattice...
Abstract The influence of conduction electrons on the optical properties in near infrared has been investigated for sputtered In 2 O 3 films. results are interpreted using present theories absorption and dispersion by free carriers. frequency range considerably influenced anisotropy predominant scattering mechanism (scattering at charged defect centres) low mean time (τ ≈ 1.5 × 10 −15 s).
Thermal expansion was determined for two series of ternary compounds, Ba8MxGe46−x and Ba8MxSi46−x, with M=Cu, Zn, Pd, Ag, Cd, Pt, Au several quaternary compounds which we investigated the influence substitution by Zn/Ni in Ba8ZnxGe46−x as well dependence thermal on Si/Ge ratio Ba8Cu5SixGe41−x. In temperature range from 4.2 to 300 K all measured a capacitance dilatometer, whereas 700 selected samples dynamic mechanical analyzer employed. The low data compare lattice parameters single...
We present data on the magnetic and magneto-elastic coupling in hexagonal multiferroic manganite LuMnO3 from inelastic neutron scattering, magnetization thermal expansion measurements. measured magnon dispersion along main symmetry directions used this to determine principal exchange parameters a spin-wave model. An analysis of anisotropy terms crystal field acting Mn is presented. compare results for with other RMnO3 compounds.
NdCu2 crystallizes in the orthorhombic CeCu2 structure. Using temperature dependent X-ray diffraction variations of lattice parameters with have been measured and compared those YCu2. A magnetic ordering at TN=6.5+or-0.1 K a spin-reorientation (TR=4.1+or-0.1 K) observed susceptibility, specific heat resistivity. Further field-induced transitions around 1, 3 15 T (depending on measuring temperature) were found magnetization magnetoresistance. preliminary phase diagram is presented. The...
Abstract Selenogermanate(IV) können aus wäßriger Lösung durch Umsetzung von Alkaliseleniden mit Germaniumdiselenid dargestellt werden. Die bei einem Molverhältnis 1:1 erhaltene Verbindung Na 4 Ge 2 Se 6 · 16 H O wurde eine vollständige Röntgenstrukturanalyse sowie Schwingungsspektren charakterisiert. Sie kristallisiert in der monoklinen Raumgruppe P2 1 /c a = 9,894(4), b 11,781(5), c 12,225(6) Å, β 92,90(4)°, Z und enthält isolierte, zwei kantenverknüpften Tetraedern bestehende 4− ‐Anionen...
Abstract The paper describes the development of a semi-active damping system used on rail vehicles. Applying skyhook control strategy, improvement ride comfort can be achieved for passengers. design and hydraulic damper are explained. Computer simulations complex three-dimensional vehicles served process results described. Measured force responses prototype shown compared to simulation results. First measurements from field tests with show, that up 15% quality real vehicle.
Measurements of the magnetic, thermal, and transport properties ${\text{CeIn}}_{2}$ binary alloy are consistent with a paramagnetic-ferromagnetic transition at ${T}_{C}=22\text{ }\text{K}$. A discontinuity in magnetic entropy, electrical resistivity thermal expansion, huge anomaly specific heat 113 J/mol K $(\ensuremath{\Delta}{c}_{mag}=103\text{ }\text{J}/\text{mol}\text{ }\text{K})$, transition, observed. In addition, Arrott plots show negative slope low fields, field-cooling field-warming...
Novel filled skutterudites Ba<sub>y</sub>Ni<sub>4</sub>Sb<sub>12−x</sub>Sn<sub>x</sub>(<italic>y</italic><sub>max</sub>= 0.93) have been prepared and thoroughly characterized, which show anomalously high lattice thermal conductivity.
A variety of physical properties (low-temperature X-ray diffraction, electrical resistivity, thermal conductivity, thermopower, specific heat, expansion and susceptibility) orthorhombic SmCu2 have been studied. significant contribution the J=5/2 Hund ground state has observed. An estimation overall crystal-field splitting obtained from termal experiment yields a value 110 K. The magnetic entropy indicates doublet state, since observed (Sm=5.50+or-0.2 J mol-1 K-1) is very near to theoretical...
A versatile system for measuring the thermal expansion and magnetostriction of spherical samples has been developed. diaphragm sensor was constructed changes in strain (Δl/l0) range 10−3–10−6. gauge technique is used where change length sample determined by deformation a membrane. linear correlation between output signal shown. The temperature dependent calibration function data processing system. device calibrated using known Ni Al 80–300 K. correct operation this verified Cu Nb. In...
In recent years there has been a growing demand for electronically controlled suspensions in rail vehicles. Active car body tilting as well active or semi-active suspension control have implemented successfully by industry. This paper describes the development of technology which integrates tilting, lateral positioning and damping vehicle's body. The focus is on computer simulation hardware development.
Measurements of the temperature- and concentration-dependent thermal conductivity Ce(CuxAl1-x)5 La(CuxAl1-x)5 compounds (0.8<or=x<or=1) are presented. In both series, an increasing Al content causes unusual growth portion lattice contribution to total conductivity. For boundary CeCu5 LaCu5, is practically negligible. A comparison experimental data isostructural magnetic non-magnetic reveals clear evidence Kondo-type scattering processes in Ce-based samples. remarkable change crystal field...
We present magnetostriction and magnetization measurements of a cobalt ferrite Co0.8Fe2.2O4 single crystal. observe unusual behaviour in the magnetic hard axis crystal which manifests jump curve at critical field. This first order process (FOMP) is explained as an anisotropy driven transition visible temperatures lower than 150 K. By analyzing constants we found that higher constant K2 dominates energy. In FOMP clearly huge [111] direction, can be by means geometric model.