Magnetostructural phase transition and magnetocaloric effect in off-stoichiometric Mn1.9−xNixGe alloys
Magnetostructural phase transition and magnetocaloric effect in off-stoichiometric Mn1.9−xNixGe alloys
复制标题
DOI：
10.1063/1.2990649
复制
发表时间：
2008-09
影响因子：
4
通讯作者：
C. L. Zhang;D. H. Wang;Q. Cao;Z. D. Han;H. Xuan;Y. Du
中科院分区：
文献类型：
--
作者：
C. L. Zhang;D. H. Wang;Q. Cao;Z. D. Han;H. Xuan;Y. Du
研究了Mn 1.9 −xNixGe（x= 0.85，0.855）合金的相变和磁熵变。在这些非化学计量比合金中，由于过渡金属原子的缺乏，晶体学转变温度显著降低，因此，观察到从反铁磁性TiNiSi型结构到铁磁性Ni2In型结构的磁结构转变。由于磁化强度的突变，获得了大的磁熵变。讨论了过渡金属空位对相变温度的影响。
Phase transitions and magnetic entropy changes are studied in Mn1.9−xNixGe (x=0.85, 0.855) alloys. In these off-stoichiometric alloys, the crystallographic transition temperature decreases remarkably due to the deficiency of transition-metal atoms, and, consequently, a magnetostructural transition from the antiferromagnetic TiNiSi-type structure to the ferromagnetic Ni2In-type structure is observed. Owing to the abrupt change in magnetization, large magnetic entropy changes are obtained. The effect of transition-metal vacancies on the phase transition temperature is discussed.