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首页> 外文期刊>Journal of Crystal Growth >Chemical reactions on the Bi_2Te_3-Bi_2Se_3 section in the process of crystal growth
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Chemical reactions on the Bi_2Te_3-Bi_2Se_3 section in the process of crystal growth

机译:晶体生长过程中Bi_2Te_3-Bi_2Se_3截面上的化学反应

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摘要

By methods of differential-thermal analysis and X-ray-phase analysis it is proved that the Bi_2Te_3-Bi_2Se_3 section is a system with a continuous series of solid solutions, with the formation of Bi_2Te_2Se compound below the solidus line. The formation of this compound has been confirmed both in experiment and by thermodynamic analysis (TDA). It has been found that after zone melting the temperature values of the liquidus and solidus lines correlate with those obtained for equilibrium systems and mentioned in the literature. The boundary has been identified for the existence of Bi_2Te_(3-x)Se_x solid solutions, which lies at ~14 mol% Bi_2Se_3 (Bi_2Te_(2.58)Se_(0.42)). TDA shows chemical interactions (reactions) resulting in the formation of Bi_2Te_2Se. It has been found that in the two-phase zone, the Seebeck coefficient values dramatically change in a jumping manner, with the points of extremum located on the boundaries of the two-phase zone. In the zone of Bi_2Te_2Se compound occurrence (33.3 mol% Bi_2Se_3), the values of the Seebeck coefficient and power factor are minimal.
机译:通过差热分析和X射线相分析的方法,证明了Bi_2Te_3-Bi_2Se_3截面是一系列连续的固溶体体系,在固相线以下形成了Bi_2Te_2Se化合物。在实验和热力学分析(TDA)中均已确认该化合物的形成。已经发现,在区域熔化之后,液相线和固相线的温度值与从平衡系统获得的温度值相关并且在文献中提到。已经确定存在Bi_2Te_(3-x)Se_x固溶体的边界,该边界位于〜14摩尔%Bi_2Se_3(Bi_2Te_(2.58)Se_(0.42))处。 TDA显示化学相互作用(反应),导致Bi_2Te_2Se的形成。已经发现,在两相区中,塞贝克系数值以跳跃的方式急剧变化,极值点位于两相区的边界上。在Bi_2Te_2Se化合物的出现区域(Bi_2Se_3为33.3mol%)中,塞贝克系数和功率因数的值最小。

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