| Abstract Scope |
The interfacial reactions in the Ni/(Se-90.0at.%Te) and Ni/Pb1-xSnxSe (x=0.1, 0.2, 0.3) couples reacted at 500oC are examined. At 500oC, Se-90.0at.%Se is molten and Pb1-xSnxSe is solid. Two reaction phase layers, Ni3Te2 and NiTe2, are found in the solid Ni/liquid Se-90at.%Te couple, and there are concentration gradients in the liquid phase after reaction. The reaction path is Ni/Ni3Te2/NiTe2/Liquid. The Sn-doped-PbSe phase, Pb1-xSnxSe, retains the crystal structure of PbSe. A ternary compound, Ni3Pb2Se2, was found in the Ni/PbSe couples. The interfacial reaction results in the Ni/Pb1-xSnxSe (x=0.1, 0.2, 0.3) couples are similar to those in the Ni/PbSe couples and the Ni3Pb2Se2 phase is found. But, depending upon Sn contents, much more complicated results are formed, and a second phase with composition about Ni5.62SnSe2 is found. It was found that Ni is the fastest diffusion species. The related phase diagrams are assessed and used for the illustration of the above-mentioned interfacial reactions. |