کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1591572 | 1515590 | 2015 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: EXAFS study of thermoelectric BiCuOSe: Effects of Cu vacancies EXAFS study of thermoelectric BiCuOSe: Effects of Cu vacancies](/preview/png/1591572.png)
• The ZrCuSiAs-structured BiCuOSe is a promising thermoelectric material.
• Its performance can be enhanced by introducing copper vacancies.
• Temperature-dependent EXAFS is carried out for x=0 and 0.05 BiCu1−xOSe samples.
• Cu vacancies are shown to make the lattice softer and lattice thermal conductivity lower.
• In a local scale the nearest Cu–Se shell in x=0.05 sample displays higher static order.
Excellent thermoelectric performance has been reported for the ZrCuSiAs-type BiCuOSe derivatives; for these materials the transport properties can be effectively adjusted by chemical substitutions or by introducing Cu vacancies. In this work we compare stoichiometric BiCuSeO and its Cu-deficient derivative BiCu0.95SeO by utilizing temperature-dependent extended X-ray absorption fine structure (EXAFS) measurements. Such a local probe evidences that Cu vacancies make the lattice more ductile and susceptible to temperature variation.
Journal: Solid State Communications - Volume 206, March 2015, Pages 12–16