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Ag-Se-Sn phase diagrams and Sn/Ag2Se interfacial reactions

机译:AG-SE-SN相图和SN / AG2SE界面反应

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Ag2Se is a prominent thermoelectric material and Sn is a primary constituent element of joining alloys. The interfacial reactions in the Sn/Ag2Se couples at 550 degrees C, 400 degrees C and 250 degrees C are examined for various reaction times between 5 and 120 min. To provide fundamental understanding, the phase equilibria isothermal sections of the ternary Ag-Se-Sn system are also determined. The respective isothermal sections are proposed based on limited ternary experimental results, Ag-Se-Sn phase equilibria studies and the phase diagrams of its constituent binary systems. The reaction layers are parallel to Ag2Se substrate and grow thicker with longer reaction times and higher temperatures. Besides a thin SeSn phase layer, a thick ternary Ag8Se6Sn phase is observed in the reacted Sn/Ag2Se couples at all temperatures. Ag concentration decreases in the reaction path from Ag2Se side towards molten Sn. Hence, excess Ag is dissolved in the liquid phase and epsilon-Ag3Sn phase precipitates when the couple is removed from the furnace. The determined reaction path is liquid/SeSn/Ag8Se6Sn/Ag2Se for all temperatures. (C) 2019 Elsevier B.V. All rights reserved.
机译:Ag2se是一个突出的热电材料,Sn是连接合金的主要成分元件。 SN / Ag2SE在550℃下耦合的界面反应,在550℃和250℃下进行400℃,在5-120分钟之间进行各种反应时间。为了提供基本的理解,还确定了三元AG-SES系统的相平衡等温部分。基于有限的三元实验结果,Ag-SE-Sn相平衡研究和其组成二元系统的相图提出了各等温部分。反应层平行于Ag2Se底物,并在更长的反应时间和更高的温度下生长较厚。除了薄的SESN相层之外,在所有温度下在反应的SN / Ag2SE夫妇中观察到厚三元Ag8Se6Sn相。 Ag浓度从Ag2se侧朝向熔融Sn的反应路径降低。因此,当耦合从炉中除去时,将过量的Ag溶解在液相和epsilon-Ag3Sn相沉淀物中。确定的反应路径为所有温度为液体/ sesn / ag8se6sn / ag2se。 (c)2019 Elsevier B.v.保留所有权利。

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