Abstract

Series of compounds Ni_{3 – x}MTe₂ (M = Sb, Sn; x = 0–1) were obtained by high-temperature sealed-tube synthesis and characterized by X-ray powder diffraction and ¹²¹Sb and ¹¹⁹Sn Mössbauer spectroscopy. For Ni_3–xSnTe₂, it was shown that, as х varies from 1 to 0, nickel is distributed over three possible sites, two of which give a total occupancy of 1 and have ordered vacancies. Meanwhile, for Ni_3–xSbTe₂ and х other than ~0.9–1.0, the vacancy ordering disappears. The temperature dependence of the presence or absence of vacancy ordering was established for Ni₂SbTe₂; the ordering disappears on heating above 600°C and appears again on cooling.

中文翻译：

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消失的超结构：Ni3 – xMTe2 (M = Sb, Sn) 的晶体和局部结构

摘要

通过高温密封管合成得到了系列化合物Ni _{3 – x} MTe ₂ (M = Sb, Sn; x = 0–1)，并通过X射线粉末衍射和¹²¹ Sb 和¹¹⁹ Sn 穆斯堡尔谱进行了表征。对于 Ni _{3– x} SnTe ₂，结果表明，当х从 1 到 0 变化时，镍分布在三个可能的位点上，其中两个位点的总占有率为 1 并且具有有序空位。同时，对于 Ni _{3– x} SbTe ₂和х除了 ~0.9–1.0 之外，空位排序消失。_{对于 Ni 2} SbTe ₂，建立了空位有序存在或不存在的温度依赖性；加热至 600°C 以上时，有序性消失，冷却后再次出现。