This title appears in the Scientific Report :
2003
Please use the identifier:
http://dx.doi.org/10.1016/S0925-8388(03)00439-0 in citations.
Crystal structure and lattice dynamics of superionic copper selenide Cu 2-delta Se
Crystal structure and lattice dynamics of superionic copper selenide Cu 2-delta Se
The crystal structure and lattice dynamics of copper selenide were studied in the superionic (alpha) and the non-superionic beta-phase. X-ray and neutron powder diffraction confirmed space group Fm3m for Cu1.78Se with Cu atoms mainly in the tetrahedral 8(c) sites and a small fraction in trigonal 32(...
Saved in:
Personal Name(s): | Danilkin, S. A. |
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Skomorokhov, A. N. / Hoser, A. / Fuess, H. / Rajevac, V. / Bickulova, N. N. | |
Contributing Institute: |
Streumethoden; IFF-ISM |
Published in: | Journal of alloys and compounds, 361 (2003) S. 57 - 61 |
Imprint: |
Lausanne
Elsevier
2003
|
Physical Description: |
57 - 61 |
DOI: |
10.1016/S0925-8388(03)00439-0 |
Document Type: |
Journal Article |
Research Program: |
Betrieb und Weiterentwicklung der Neutronenquelle FRJ- 2 |
Series Title: |
Journal of Alloys and Compounds
361 |
Subject (ZB): | |
Publikationsportal JuSER |
The crystal structure and lattice dynamics of copper selenide were studied in the superionic (alpha) and the non-superionic beta-phase. X-ray and neutron powder diffraction confirmed space group Fm3m for Cu1.78Se with Cu atoms mainly in the tetrahedral 8(c) sites and a small fraction in trigonal 32(f) sites. Inelastic neutron scattering in polycrystalline alpha-Cu1.78Se and beta-Cu2Se samples indicate the presence of a broad quasi-elastic component and low-energy peaks in the dynamic structure factor S(Q,omega). The quasi-elastic component is related to localised diffusion of Cu ions in the 32(f) sites. The low-energy modes observed in Cu, Se and Cu,Se at energies of 4-5 meV are most probably due to acoustic phonons. The phonon dispersion curves measured in alpha-Cu1.85Se single crystal reveal the existence of low-lying acoustic transversal branches with no marked dispersion at wavevectors higher than 0.3-0.4 q/q(m) with an energy of about 4 meV. (C) 2003 Elsevier B.V. All rights reserved. |