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Journal of Materials Science
Published in: Journal of Materials Science 6/2011

01-03-2011

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

Authors: J. D. Sugar, D. L. Medlin

Published in: Journal of Materials Science | Issue 6/2011

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Abstract

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)3Te4 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)3Te4 to Sb2Te3: evaporation–condensation and individual step motion. The microstructural evolution and mechanisms of the transformation are discussed in detail.
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Footnotes
1
Since the objective aperture was too large to limit the illumination in the dark-field image to the 0 0 0 21 reflection only, both the 0 0 0 21 and 0 0 0 18 reflections were within the limits of the objective aperture.
 
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Metadata
Title
Solid-state precipitation of stable and metastable layered compounds in thermoelectric AgSbTe2
Authors
J. D. Sugar
D. L. Medlin
Publication date
01-03-2011
Publisher
Springer US
Published in
Journal of Materials Science / Issue 6/2011
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-010-4984-4

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