Ba-Cu-Si Clathrates: Phase Equilibria and Crystal Chemistry

被引：26
|
作者：
Yan, X. [1 ,2 ]
Giester, G. [3 ]
Bauer, E. [1 ]
Rogl, P. [2 ]
Paschen, S. [1 ]
机构：
[1] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria
[2] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria
[3] Univ Vienna, Inst Mineral & Crystallog, A-1090 Vienna, Austria
来源：
JOURNAL OF ELECTRONIC MATERIALS | 2010年 / 39卷 / 09期
关键词：
Clathrate; phase equilibria; crystal chemistry; THERMOELECTRIC PROPERTIES; INTERMETALLIC COMPOUNDS; ENHANCEMENT; FIGURE; AG;
D O I：
10.1007/s11664-010-1253-x
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The formation and crystal chemistry of ternary clathrates in the Ba-Cu-Si system were investigated on a series of compounds Ba8Cux Si46-x (3 <= x <= 8). The phase diagram around the clathrate phase was constructed at 800A degrees C, revealing a homogeneity range from Ba8Cu3.4Si42.6 to Ba8Cu4.8Si41.2. Structural investigations confirmed that the clathrates in this system crystallize with cubic primitive symmetry, in the type I clathrate structure (space group Pm (3) over barn). Single-crystal x-ray diffraction indicates that the Cu atoms partially substitute for Si atoms on the 6d site; no vacancies are observed.
引用
收藏
页码：1634 / 1639
页数：6
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