Detection of internal cracks and ultrasound characterization of nanostructured Bi₂Te₃-based thermoelectrics via acoustic microscopy

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• 作者：V.M. Prokhorov ; ^a ; ^{pvm@tisnum.ru"" rel=""nofollow} ; G.I. Pivovarov^a
• 关键词：Acoustic microscopy ; Ultrasound characterization ; Nanostructured materials ; Bi₂Te₃-based thermoelectric alloys ; Elastic properties
• 刊名：Ultrasonics
• 出版年：2011
• 出版时间：August 2011
• 年：2011
• 卷：51
• 期：6
• 页码：715-718
• 全文大小：489 K

文摘

The search for thermoelectric (TE) materials for highly efficient devices aims at improving the TE efficiency and broadening their areas of applications. We created nanostructured thermoelectric Bi–Sb–Te-family materials by high energy (ball milling) pre-treatment of the parent materials followed by high-pressure/high-temperature treatment. Bi_0.5Sb_1.5Te₃ compositions with the superfluous maintenance of tellurium was used for the synthesis of the samples with p-type electrical conductivity. Acoustic microscopy was used to study elastic properties and bulk irregularities and to detection of internal cracks both in the parent materials and in the created nanostructured samples. The data has been used for optimization of parameters of synthesis of nanostructured thermoelectrics.