Interfacial defect structure at Sb₂Te₃ precipitates in the thermoelectric compound AgSbTe₂

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• 作者：D.L. Medlin ; J.D. Sugar
• 关键词：Thermoelectric materials ; Phase transformations ; Precipitation ; Interfaces ; High-resolution electron microscopy (HREM)
• 刊名：Scripta Materialia
• 出版年：2010
• 出版时间：March 2010
• 年：2010
• 卷：62
• 期：6
• 页码：379-382
• 全文大小：229 K

文摘

We analyze a line defect at the interface between tetradymite-structured Sb₂Te₃ and rocksalt-structured AgSbTe₂ using high-resolution electron microscopy. By determining the step-height and Burgers vector of this defect, we show how motion of the defect, through a diffusive glide mechanism, can transform material from the rocksalt structure to the tetradymite structure. We discuss the atomic flux requirements for this defect motion. This analysis helps to explain the growth mechanism of tetradymite precipitates within rocksalt-structured chalcogenides.