New experimental studies on the phase relationship of the Bi–Pb–Te system

New experimental studies on the phase relationship of the Bi–Pb–Te system
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Bi-Pb-Te体系相关系的新实验研究

DOI:
10.1016/j.matdes.2022.111384
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发表时间:
2022-12
期刊:
影响因子:
8.4
通讯作者:
Toyohisa Fujita
Toyohisa Fujita
中科院分区:
材料科学1区
文献类型:
--
作者:
D;an Huang;Dechen Xia;Tianfan Ye;Toyohisa Fujita

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相关系的知识在开发热电材料中至关重要,并允许更好地理解相关系统的特性。本文给出了Bi-Pb-Te体系的液相线投影和BiTe-PbTe-Bi_2Te_3部分在400和520 °C下的相平衡。采用高纯元素在洁净石英管中熔融制备合金,并采用扫描电镜、电子探针、波长色散X射线光谱仪、X射线衍射仪和差示扫描量热仪对合金的微观结构进行了表征。二元化合物BiTe延伸至16.7at.%在520 °C时,Pb沿着BiTe-PbTe。Bi在PbTe中的溶解度分别为3.6,3.8和10.8at.%分别在360、400和520 °C下。这项工作将有助于了解Bi-Pb-Te基高性能材料在制备和服役过程中的微观结构演变,促进Bi-Pb-Te基高性能材料的设计。
Knowledge of the phase relationships is crucial in developing thermoelectric materials and allows a better understanding of the properties of the relevant systems. In the present work, we present the liquidus projection of the Bi-Pb-Te system and phase equilibria of the BiTe-PbTe-Bi2Te3portion at 400 and 520 °C. Alloys were prepared by melting high-purity elements in cleaned quartz tubes and their microstructures were characterized by scanning electron microscopy, electron probe microanalysis, wavelength-dispersive X-ray spectrometer, X-ray diffractometry and differential scanning calorimetry. The binary compound BiTe extends up to 16.7 at.% Pb along BiTe-PbTe at 520 °C. The solubilities of Bi in PbTe were established to be 3.6, 3.8 and 10.8 at.% at 360, 400 and 520 °C, respectively. This work will help to understand the microstructure evolution during preparation and service and promote the designing of the Bi–Pb–Te-based high-performance materials.
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