Electronic structures and magnetisms of the Co_2TiSb_(1-x)Sn_x(x= 0, 0.25, 0.5) Heusler alloys: A th

• 作 者: 王立英 代学芳 王啸天 林婷婷 陈磊 刘然 崔玉亭 刘国栋
• 机 构: School of Physics and Electronic Engineering, Chongqing Normal University,School of Materials Scienc
• 出 处: Chinese Physics B
• 发表日期: 2015年12期
• 关键词: tetragonal ferromagnetic martensite happen cubic austenite occupy preference Fer

The total energy, electronic structures, and magnetisms of the Al Cu2Mn-type Co2TiSb1-xSnx(x = 0, 0.25, 0.5) with the different lattice parameter ratios of c/a are studied by using the first-principles calculations. It is found that the phase transformation from the cubic to the tetragonal structure lowers the total energy, indicating that the martensitic phase is more stable and that a phase transition from austenite to martensite may happen at a lower temperature. Thus, a ferromagnetic shape memory effect can be expected to occur in these alloys. The Al Cu2Mn-type Co2TiSb1-xSnx(x = 0, 0.25, 0.5) alloys are weak ferrimagnets in the austenitic phase and martensitic phase.

The total energy, electronic structures, and magnetisms of the Al Cu2Mn-type Co2TiSb1-xSnx (x = 0, 0.25, 0.5) with the different lattice parameter ratios of c / a are studied by using the first-principles calculations. It is found that the phase transformation from the cubic to the tetragonal structure lowers the total energy, indicating that the martensitic phase is more stable and that a phase transition from austenite to martensite may be at a lower temperature. Thus, a ferromagnetic shape memory effect can be expected to occur in these alloys. The Al Cu2Mn-type Co2TiSb1-xSnx (x = 0, 0.25, 0.5) alloys are weak ferrimagnets in the austenitic phase and martensitic phase.