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Defect structure in non-stoichiometric CoTi with CsCl-type ordered structure

机译：具有CsCl型有序结构的非化学计量CoTi中的缺陷结构

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摘要

Positron lifetimes in CsCl-type intermetallic compounds Co_(100-X)Ti_X (X = 48-50.3) water-quenched and furnace-cooled from 1323 K have been measured to study their defect structures. Positron mean lifetimes in water-quenched specimens of both Co-rich and Ti-rich compositions are much longer than the calculated positron lifetime in the perfect lattice, and no matrix component is observed. The positron mean lifetimes in the furnace-cooled specimens of Ti-rich compositions do not have large difference from those for the water-quenched specimens, whereas the furnace-cooled specimens of Co-rich compositions show short positron mean lifetimes, which are almost equal to the calculated lifetime in the perfect lattice. These results indicate that Co-antistructure atoms and Co-vacancies are formed in CoTi as constitutional defects in accord with the model proposed by Bradley and Taylor.
机译：测量了CsCl型金属间化合物Co_（100-X）Ti_X（X = 48-50.3）从1323 K水淬和炉冷后的正电子寿命，以研究其缺陷结构。富钴和富钛组成的水淬样品中的正电子平均寿命比理想晶格中计算出的正电子寿命要长得多，并且没有观察到基质成分。富钛组合物的炉冷样品中的正电子平均寿命与水淬样品的正电子平均寿命没有太大差异，而富钴组合物的炉冷样品中的正电子平均寿命短，几乎相等到理想晶格中计算出的寿命。这些结果表明，与Bradley和Taylor提出的模型相一致，Co-反结构原子和Co-空位在CoTi中形成为构成缺陷。

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