Annealing temperature dependence of crystal structures and magnetic properties of Fe₂CrAl and Fe₂CrGa Heusler alloys

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• 作者：R.Y. Umetsu^a ; ^{rieume@imr.tohoku.ac.jp} ; N. Morimoto^b ; M. Nagasako^c ; R. Kainuma^c ; T. Kanomata^b ; ^c
• 关键词：Heusler alloys ; L21 ; B2 and A2-type phases ; Phase stability ; Order&ndash ; disorder transition temperature ; Curie temperature ; Magnetic moment
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：5 July, 2012
• 卷：528
• 期：Complete
• 页码：34-39
• 文件大小：1225 K

摘要

The crystal structures, spontaneous magnetic moment, I_s, and the Curie temperature, T_C, of Fe₂CrAl and Fe₂CrGa Heusler alloys were investigated. Single phases of A2, B2 and L2₁-type structures were obtainable in Fe₂CrAl alloy by controlling the annealing temperature. The values of the I_s and T_C of the A2-type phase were 2.2 渭_B/f.u. and 316 K and those of the B2-type phase were 2.0 渭_B/f.u. and 274 K, larger than those of the L2₁-type phase of 1.6 渭_B/f.u. and 210 K, respectively. A single phase of the A2-type phase in Fe₂CrGa alloy was obtained and the I_s and T_C were about 2.8 渭_B/f.u. and 353 K, respectively. The B2 or L2₁-type single phases of Fe₂CrGa alloy could not be obtained because of the inevitable precipitants.