In y Co4Sb12 Skutterudite: Phase Equilibria and Crystal Structure

被引：37
作者：
Grytsiv, A. [1 ,2 ]
Rogl, P. [1 ]
Michor, H. [2 ]
Bauer, E. [2 ]
Giester, G. [3 ]
机构：
[1] Univ Vienna, Inst Phys Chem, A-1090 Vienna, Austria
[2] Vienna Univ Technol, Inst Solid State Phys, A-1040 Vienna, Austria
[3] Univ Vienna, Inst Mineral & Crystallog, A-1090 Vienna, Austria
来源：
JOURNAL OF ELECTRONIC MATERIALS | 2013年 / 42卷 / 10期
关键词：
Indium-based skutterudite; thermometric; phase equilibria; crystal structure; physical properties; THERMOELECTRIC PROPERTIES; TRANSPORT-PROPERTIES; PERFORMANCE;
D O I：
10.1007/s11664-013-2679-8
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：
Phase relations were investigated for the In-Co-Sb system in the temperature range from 375A degrees C to 800A degrees C using as-cast and annealed alloys. Phase equilibria in the CoSb-InSb-(Sb) composition triangle are presented by a series of isothermal sections and solidus and liquidus surfaces, accompanied by a Schulz-Scheil reaction scheme. The indium-filled skutterudite In (y) Co4Sb12 already forms an equilibrium with liquid at 484A degrees C, which might limit high-temperature applications of In-Co-Sb-based skutterudites. The maximal solubility of indium in In (y) Co4Sb12 (y = 0.22) remains almost constant in the temperature range from 475A degrees C to 700A degrees C and corresponds to the equilibrium with CoSb2 and InSb. The solubility of indium in the skutterudite phase is reduced to y = 0.09 when it coexists in equilibrium with InSb and (Sb), and this decrease of the solubility might be responsible for the formation of InSb precipitates. Temperature-dependent x-ray single-crystal and specific heat data for In (y) Co4Sb12 were employed to determine the rattling behavior of In atoms in the skutterudite lattice.
引用
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页码：2940 / 2952
页数：13
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