| Автор | I Tsatskis |
| Автор | E K H Salje |
| Дата выпуска | 1998-05-04 |
| dc.description | The equilibrium short-range order (SRO) in Cu-Pd alloys is studied theoretically. The evolution of the Fermi surface-related splitting of the (110) diffuse intensity peak with changing temperature is examined. The results are compared with experimental observations for electron-irradiated samples in a steady state, for which the temperature dependence of the splitting was previously found in the composition range from 20 to 28 at.% Pd. The equilibrium state is studied by analysing available experimental and theoretical results and using a recently proposed alpha-expansion theory of SRO which is able to describe the temperature-dependent splitting. It is found that the electronic structure calculations in the framework of the Korringa-Kohn-Rostoker coherent potential approximation overestimate the experimental peak splitting. This discrepancy is attributed to the shift of the intensity peaks with respect to the positions of the corresponding reciprocal-space minima of the effective interatomic interaction towards the (110) and equivalent positions. Combined with an assumption about monotonicity of the temperature behaviour of the splitting, such a shift implies an increase of the splitting with increasing temperature for all compositions considered in this study. The alpha-expansion calculations seem to confirm this conclusion. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Short-range order in a steady state of irradiated Cu-Pd alloys: comparison with fluctuations at thermal equilibrium |
| Тип | paper |
| DOI | 10.1088/0953-8984/10/17/011 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 10 |
| Первая страница | 3791 |
| Последняя страница | 3806 |
| Аффилиация | I Tsatskis; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK |
| Аффилиация | E K H Salje; Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK |
| Выпуск | 17 |
