Search Results - "Würschum, R."

Atomic Structure and Structural Stability of Sc75Fe25 Nanoglasses by Fang, J. X, Vainio, U, Puff, W, Würschum, R, Wang, X. L, Wang, D, Ghafari, M, Jiang, F, Sun, J, Hahn, H, Gleiter, H

“…Nanoglasses are solids consisting of nanometer-sized glassy regions connected by interfaces having a reduced density. We studied the structure of Sc75Fe25…”
Get full text

Charge-Induced Reversible Strain in a Metal by Weissmüller, J., Viswanath, R. N., Kramer, D., Zimmer, P., Würschum, R., Gleiter, H.

“…Dimension changes on the order of 0.1% or above in response to an applied voltage have been reported for many types of materials, including ceramics, polymers,…”
Get full text

Indirect magneto-ionic effect in FeSi2/Si nanocomposite induced by electrochemical lithiation and delithiation by Prasch, M, Würschum, R, Topolovec, S

“…A nanocomposite consisting of iron disilicide nanocrystals embedded in a Si matrix was prepared from industry-grade ferrosilicon by ball milling and subsequent…”
Get full text

High-precision isothermal dilatometry as tool for quantitative analysis of precipitation kinetics: case study of dilute Al alloy by Enzinger, R., Hengge, E., Sprengel, W., Würschum, R.

“…An in-depth case study of precipitation kinetics for alloys is presented utilizing recent progress in high-precision isothermal dilatometry by measuring…”
Get full text

Effect of dipolar and exchange interactions on magnetic blocking of maghemite nanoparticles by Nadeem, K., Krenn, H., Traussnig, T., Würschum, R., Szabó, D.V., Letofsky-Papst, I.

“…Magnetic interparticle interactions compete with the magnetic blocking of ultrafine magnetic nanoparticles. We have prepared maghemite (γ-Fe 2O 3)…”
Get full text

Precipitation processes in Al–Mg–Si extending down to initial clustering revealed by the complementary techniques of positron lifetime spectroscopy and dilatometry by Resch, L., Klinser, G., Hengge, E., Enzinger, R., Luckabauer, M., Sprengel, W., Würschum, R.

“…The design of specific material properties of aluminum alloys demands for a detailed understanding of clustering and precipitation processes occurring during…”
Get full text

Nanoporous Pd1−xCox for hydrogen-intercalation magneto-ionics by Gößler, M., Topolovec, S., Krenn, H., Würschum, R.

“…The use of hydrogen atoms for magneto-ionic applications has only been explored recently. Benefits of hydrogen compared to other ionic species for tuning…”
Get full text

Influence of defects on ionic transport in LiTaO3 – A study using EXAFS and positron annihilation lifetime spectroscopy by Gadermaier, B., Resch, L., Pickup, D.M., Hanghofer, I., Hanzu, I., Heitjans, P., Sprengel, W., Würschum, R., Chadwick, A.V., Wilkening, H.M.R.

“…Defects of various types in crystalline and nanocrystalline materials govern a range of electrical, optical and mechanical properties. In particular, they are…”
Get full text

Quantitative volumetric identification of precipitates in dilute alloys using high-precision isothermal dilatometry by Hengge, E., Enzinger, R., Luckabauer, M., Sprengel, W., Würschum, R.

“…The present case study demonstrates that high-precision dilatometry serves as sensitive tool for quantitatively characterising precipitation processes down to…”
Get full text

Nanocrystalline materials: a way to solids with tunable electronic structures and properties? by Gleiter, H., Weissmüller, J., Wollersheim, O., Würschum, R.

“…It is the purpose of this paper to point out that nanometer-sized structures may open the way to modify the electronic structure (e.g. the charge carrier…”
Get full text

Electrically tunable resistance of a metal by Sagmeister, M, Brossmann, U, Landgraf, S, Würschum, R

“…Electric field-induced tuning of material properties is usually restricted to nonmetals such as semiconductors and piezoelectric ceramics. We show that…”
Get full text

Internal stress and defect-related free volume in submicrocrystalline Ni studied by neutron diffraction and difference dilatometry by Kotzurek, J. A., Hofmann, M., Simic, S., Pölt, P., Hohenwarter, A., Pippan, R., Sprengel, W., Würschum, R.

“…A combined study of neutron diffraction and difference dilatometry on submicrocrystalline Ni prepared by high pressure torsion aims at studying the anisotropic…”
Get full text

Diffusion in Nanocrystalline Metals and Alloys-A Status Report by Würschum, R., Herth, S., Brossmann, U.

“…Diffusion is a key property determining the suitability of nanocrystalline materials for use in numerous applications, and it is crucial to the assessment of…”
Get full text

Simultaneous study of vacancy formation and migration at high temperatures in B2-type Fe aluminides by Würschum, R, Grupp, C, Schaefer, H

Get full text

Operando monitoring of charging-induced defect formation in battery electrodes by positrons by Klinser, G., Kren, H., Koller, S., Würschum, R.

“…The defect specific technique of positron–electron annihilation is utilized in an appropriate electrochemical cell for operando monitoring of vacancy-type…”
Get full text

Structural and optical properties of nanoparticulate Y2O3:Eu2O3 made by microwave plasma synthesis by Kautsch, A., Brossmann, U., Krenn, H., Hofer, F., Szabó, D. V., Würschum, R.

“…Nanoparticulate Y 2 O 3 :Eu 2 O 3 with a small, uniform particle size and a well-defined composition was synthesized using a low temperature microwave plasma…”
Get full text

Study of an order-disorder phase transition on an atomic scale: the example of decagonal Al-Ni-Co quasicrystals by Sato, K, Baier, F, Sprengel, W, Würschum, R, Schaefer, H-E

“…In the present paper we succeeded in studying structural phase transitions from an atomistic point of view by positron annihilation Doppler broadening. This…”
Get full text

Time-Differential Length Change Measurements for Thermal Defect Investigations: Intermetallic B2-FeAl and B2-NiAl Compounds, a Case Study by Schaefer, H.-E., Frenner, K., Würschum, R.

Get full text

Kinetics of vacancy annealing upon time-linear heating applied to dilatometry by Enzinger, R., Neubauer, Chr, Kotzurek, J., Sprengel, W., Würschum, R.

“…A kinetic model for the diffusion-controlled annealing of excess vacancies under the experimentally relevant, non-isothermal condition of time-linear heating…”
Get full text

Synthesis and optical properties of organic semiconductor: zirconia nanocomposites by Sagmeister, M., Brossmann, U., List, E. J. W., Ochs, R., Szabó, D. V., Saf, R., Grogger, W., Tchernychova, E., Würschum, R.

“…Oxide nanoparticles were used as carrier for organic semiconductor materials. Stable suspensions of ZrO 2 nanoparticles coated with anthracene, pentacene, or…”
Get full text