期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 4, 页码 1727-1735出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta09690a
关键词
-
资金
- DFG [SPP1386]
- FWF [TRP 176-N22, I2535-N27]
- Christian Doppler Laboratory for Thermoelectricity
- European C-MAC
- Austrian Science Fund (FWF) [I2535] Funding Source: Austrian Science Fund (FWF)
Intermetallic type-I clathrates continue to attract attention as promising thermoelectric materials. Here we present structural and thermoelectric properties of single crystalline Ba-8(Cu, Ga, Ge, square)(46), where square denotes a vacancy. By single crystal X-ray diffraction on crystals without Ga we find clear evidence for the presence of vacancies at the 6c site in the structure. With increasing Ga content, vacancies are successively filled. This increases the charge carrier mobility strongly, even within a small range of Ga substitution, leading to reduced electrical resistivity and enhanced thermoelectric performance. The largest figure of merit ZT = 0.9 at 900 K is found for a single crystal of approximate composition Ba8Cu4.6Ga1.0Ge40.4. This value, that may further increase at higher temperatures, is one of the largest to date found in transition metal element-based clathrates.
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