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Interfacial reactions in In/Bi2Se3, In/Bi2Te3 and In/Bi-2(Se0.2Te0.8)(3) couples

机译:In / Bi2Se3,In / Bi2te3和/ Bi-2(Se0.2te0.8)(3)夫妻的界面反应

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Bi-2(Se,Te)(3) is the most commonly used N-type thermoelectric materials. The interfacial reactions in In/ Bi2Se3 and In/Bi2Te3 couples at 400 degrees C, 250 degrees C and 200 degrees C and In/Bi-2(Se0.2Te0.8)(3) couples at 250 degrees C are systematically determined for the first time. Significant interfacial reactions are observed in all the couples. The reaction rate decreases when the reaction temperature is reduced and the reaction is fastest in the In/Bi2Te3 couple and slowest in the In/Bi2Se3 couple. After reaction for 5 minutes, the thickness of the reaction layer in the In/Bi2Te3 couple is 439 mu m, 44 mu m and 14 mu m at 400 degrees C, 250 degrees C and 200 degrees C, respectively. The reaction phases and reaction paths in these couples are determined. In the In/Bi-2(Se0.2Te0.8)(3) couple that is reacted at 250 degrees C, the reaction path is liquid(In)/In-4(Se,Te)(3)/liquid/(Bi-2)(m)(-Bi-2(Se,Te)(3))(n)/Bi-2(Se0.2Te0.8)(3). At 400 degrees C and 250 degrees C, Se and Te are the species that diffuse fastest in the reaction couples and the reaction path is primarily controlled by the speed with which Se and Te diffuse. However, the diffusion rates for Se and Te decrease significantly when the reaction temperature is reduced and at 200 degrees C, Se and Te cease to be the dominating diffusion species in the couples. (C) 2018 Elsevier B.V. All rights reserved.
机译:Bi-2(SE,TE)(3)是最常用的N型热电材料。 / Bi2Se3和In / Bi2te3中的界面反应在400℃,250摄氏度和200摄氏度中耦合,在250摄氏度下耦合在250℃和200摄氏度(SE0.2Te0.8)(3)耦合。第一次。在所有夫妻中观察到显着的界面反应。当反应温度降低时,反应速率降低,反应在/ Bi2Te3夫妇中最快,并且在/ Bi2Se3夫妇中最慢。在反应5分钟后,In / Bi2Te3夫妇中的反应层的厚度分别在400℃,250℃和200摄氏度中为439μm,44μm和14μm。确定这些循环中的反应阶段和反应路径。在In / Bi-2(Se0.2te0.8)(3)在250℃反应的耦合中,反应路径是液体(In)/ In-4(Se,Te)(3)/液/( Bi-2)(M)( - Bi-2(Se,Te)(3))(N)/ Bi-2(Se0.2te0.8)(3)。在400摄氏度和250摄氏度下,SE和Te是在反应耦合中最快地扩散的物种,并且反应路径主要由Se和Te弥漫的速度控制。然而,当反应温度降低并且在200摄氏度下,SE和TE的扩散速率显着降低,并且TE在夫妻中停止成为主导的扩散物种。 (c)2018年elestvier b.v.保留所有权利。

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