期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 4, 期 7, 页码 2461-2472出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ta10330d
关键词
-
资金
- Department of Energy Basic Energy Sciences program [EDCBEE]
- DOE [DE-AC02-05CH11231]
- F. R. S.-FNRS
- European Union Marie Curie Career Integration (CIG) [HTforTCOs PCIG11-GA-2012-321988]
- U.S. Department of Energy, Office of Basic Energy Sciences, Early Career Research Program
Intrinsically doped samples of YCuTe2 were prepared by solid state reaction of the elements. Based on the differential scanning calorimetry and the high temperature X-ray diffraction analyses, YCuTe2 exhibits a first order phase transition at similar to 440 K from a low-temperature-phase crystallizing in the space group P (3) over bar m1 to a high-temperature-phase in P3. Above the phase transition temperature, partially ordered Cu atoms become completely disordered in the crystal structure. Small increases to the Cu content are observed to favour the formation of the high temperature phase. We find no indication of superionic Cu ions as for binary copper chalcogenides (e.g., Cu2Se or Cu2Te). All investigated samples exhibit very low thermal conductivities (as low as similar to 0.5 W m(-1) K-1 at 800 K) due to highly disordered Cu atoms. Electronic structure calculations are employed to better understand the high thermoelectric efficiency for YCuTe2. The maximum thermoelectric figure of merit, zT, is measured to be similar to 0.75 at 780 K for Y0.96Cu1.08Te2, which is promising for mid-temperature thermoelectric applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据