Abstract Co2CrAl is predicted as a promising candidate for half-metallic ferromagnetism. Unfortunately, synthesis of the stoichiometric composition is a challenge as the samples prepared so far using various techniques suffer from formation of secondary phases and consequently anomalous physical properties. Off-stoichiometric compounds have been explored as a possible approach to avoid the secondary phase precipitation. The Co 2 Cr 0.8 Al 1.2 , Co 2 Cr 0.6 Al 1.4 and Co 2 Cr 0.4 Al 1.6 compositions were synthesized using Floating Zone (FZ) technique as they melt incongruently. The secondary phase fraction was reduced as Cr was partially substituted by Al. FZ-grown Co 2 Cr 0.4 Al 1.6 was obtained as a single phase, signifying that the composition is out of the two-phase region. Furthermore, combining the data with an earlier work on annealing of spinodally decomposed samples, valuable insight into the extent of immiscibility was obtained.

中文翻译：

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非化学计量的 Co2Cr1-xAl1+x Heusler 化合物的晶体生长：避免固态混溶间隙

摘要 Co2CrAl 被预测为半金属铁磁性的有希望的候选者。不幸的是，化学计量组成的合成是一个挑战，因为迄今为止使用各种技术制备的样品会形成第二相，从而导致物理性质异常。已经探索了非化学计量化合物作为避免第二相沉淀的可能方法。Co 2 Cr 0.8 Al 1.2 、Co 2 Cr 0.6 Al 1.4 和Co 2 Cr 0.4 Al 1.6 组合物使用浮区(FZ)技术合成，因为它们熔融不一致。由于 Cr 部分被 Al 取代，第二相部分减少。FZ-grown Co 2 Cr 0.4 Al 1.6 以单相形式获得，表明成分不在两相区域。此外，