Solid-state precipitation of stable and metastable layered compounds in thermoelectric AgSbTe2

被引：23

作者：

Sugar, J. D. ^{[1
]}

Medlin, D. L. ^{[1
]}

机构：

[1] Sandia Natl Labs, Dept Mat Phys, Livermore, CA 94550 USA

来源：

JOURNAL OF MATERIALS SCIENCE | 2011年 / 46卷 / 06期

基金：

美国能源部;

关键词：

ONE-DIMENSIONAL STRUCTURES; RAY SPECTRAL IMAGES; CONTINUOUS SERIES; SYSTEM; PHASE; TE; SB2TE3; SB; INTERFACES; ALLOYS;

D O I：

10.1007/s10853-010-4984-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The precipitation of Sb2Te3 in Sb-rich AgSbTe2 is studied by X-ray diffraction and electron microscopy. The results indicate that Sb2Te3 does not form directly, but rather through the precipitation of an intermediate metastable phase. Diffraction, energy-dispersive spectroscopy, and high-resolution transmission electron microscopy indicate that this intermediate phase has a nominal composition (Ag, Sb)(3)Te-4 and a structure with a seven-layer stacking sequence rather than a five-layer one as in Sb2Te3. Two mechanisms based on experimental observations are proposed for the conversion of (Sb, Ag)(3)Te-4 to Sb2Te3: evaporation-condensation and individual step motion. The microstructural evolution and mechanisms of the transformation are discussed in detail.

引用

页码：1668 / 1679

页数：12

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