Title
A weak compatibility condition for precipitation with application to the microstructure of <tex>$PbTe-Sb_{2}Te_{3}$</tex> thermoelectrics A weak compatibility condition for precipitation with application to the microstructure of <tex>$PbTe-Sb_{2}Te_{3}$</tex> thermoelectrics
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Oxford ,
Subject
Physics
Engineering sciences. Technology
Source (journal)
Acta materialia. - Oxford
Volume/pages
59(2011) :15 , p. 6124-6132
ISSN
1359-6454
ISI
000294086900026
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We propose a weak condition of compatibility between phases applicable to cases exhibiting full or partial coherence and Widmanstätten microstructure. The condition is applied to the study of Sb2Te3 precipitates in a PbTe matrix in a thermoelectric alloy. The weak condition of compatibility predicts elongated precipitates lying on a cone determined by a transformation stretch tensor. Comparison of this cone with the long directions of precipitates determined by a slice-and-view method of scanning electron microscopy combined with focused ion beam sectioning shows good agreement between theory and experiment. A further study of the morphology of precipitates by the Eshelby method suggests that interfacial energy also plays a role and gives an approximate value of interfacial energy per unit area of 250 dyn cm−1.
E-info
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