Background

PbTe is an important thermoelectric compound. Ni is commonly used as a barrier layer. To provide fundamental information, an Ni-Pb-Te phase equilibria isothermal section at 650 °C and Ni/PbTe interfacial reactions at 650 ^oC, 500 ^oC and 400 ^oC are determined.

Methods

The isothermal section is proposed based on results of equilibrated alloys and related phase diagrams. The interfacial reactions are examined using reaction couples.

Significant Findings

There is no ternary compound. At 650 ^oC, the liquid phase extending from the Pb corner has significant symmetrical solubilities of Ni and Te, and displays a peculiar deep and narrow shape. No interfacial reactions are observed in the Ni/PbTe couple heat-treated at 500 ^oC and 400 ^oC for a month. However, significant reactions are observed when reacted at 650 ^oC. Reaction zone thickness is 120 μm when reacted for 30 min. The reaction zone has many phases, and yet has clear phase region boundaries. Liquid and β-Ni₃Te₂ phases are formed, and the reaction path is Ni/β-Ni₃Te₂+Liquid (I)/Liquid (I)/PbTe. Many phases were formed from solidification when the couple was removed from a furnace. Ni is the dominating diffusion species in the Ni/PbTe couples. Ni penetrates into the PbTe substrate, reacts with Te to form Ni₃Te₂, and the liquid phase is formed with excess Pb.

中文翻译：

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Ni/PbTe 对中的 Ni-Pb-Te 相平衡和界面反应

背景

PbTe 是一种重要的热电化合物。Ni通常用作阻挡层。为了提供基本信息，确定了 650 °C 下的 Ni-Pb-Te 相平衡等温截面和 650 ^o C、500 ^o C 和 400 ^o C 下的Ni/PbTe 界面反应。

方法

等温截面是根据平衡合金和相关相图的结果提出的。使用反应对检查界面反应。

重要发现

没有三元化合物。在 650 ^o C 时，从 Pb 角延伸出来的液相具有显着的 Ni 和 Te 对称溶解度，并呈现出特殊的深而窄的形状。在 500 ^o C 和 400 ^o C 下热处理一个月的 Ni/PbTe 对中没有观察到界面反应。然而，当在 650 ^o C 反应时观察到显着的反应。反应 30 分钟时反应区厚度为 120 μm。反应区有许多相，但有清晰的相区边界。形成液相和β-Ni ₃ Te ₂相，反应路径为Ni/β-Ni ₃ Te ₂+液体（I）/液体（I）/PbTe。当这对夫妇从炉子中取出时，许多相是由凝固形成的。Ni 是 Ni/PbTe 对中的主要扩散物质。Ni渗入PbTe衬底，与Te反应形成Ni ₃ Te ₂，与过量的Pb形成液相。