This title appears in the Scientific Report :
2015
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.91.054110 in citations.
Please use the identifier: http://hdl.handle.net/2128/9420 in citations.
Anomalous temperature-induced volume contraction in GeTe
Anomalous temperature-induced volume contraction in GeTe
The recent surge of interest in phase-change materials GeTe, Ge2Sb2Te5, and related compounds motivated us to revisit the structural phase transition in GeTe in more detail than was done before. The rhombohedral-to-cubic ferroelectric phase transition in GeTe has been studied using high-resolution n...
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Personal Name(s): | Chatterji, Tapan (Corresponding author) |
---|---|
Kumar, Naveen / Wdowik, Urszula D. | |
Contributing Institute: |
Neutronenstreuung; ICS-1 JCNS-SNS; JCNS-SNS Neutronenstreuung; JCNS-1 |
Published in: | Physical Review B Physical review / B, 91 91 (2015 2015) 5 5, S. 054110 054110 |
Imprint: |
College Park, Md.
APS
2015
|
DOI: |
10.1103/PhysRevB.91.054110 |
Document Type: |
Journal Article |
Research Program: |
Soft Matter, Health and Life Sciences Jülich Centre for Neutron Research (JCNS) Functional Macromolecules and Complexes |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/9420 in citations.
The recent surge of interest in phase-change materials GeTe, Ge2Sb2Te5, and related compounds motivated us to revisit the structural phase transition in GeTe in more detail than was done before. The rhombohedral-to-cubic ferroelectric phase transition in GeTe has been studied using high-resolution neutron powder diffraction on a spallation neutron source. We determined the temperature dependence of the structural parameters in a wide temperature range extending from 309 to 973 K. The results of our studies clearly show an anomalous volume contraction of 0.6% at the phase transition from the rhombohedral-to-cubic phase. In order to better understand the phase transition and the associated anomalous volume decrease in GeTe, we have performed phonon calculations based on the density functional theory. Results of the present investigations are also discussed with respect to the experimental data obtained for single crystals of GeTe. |