Structural evolution, site ordering and magnetic properties of tetragonal Mn_6‐yGa_2+y (0 ≤ y ≤ 1.64)

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• 作者：Hui Zhao^a ; Wenyun Yang^a ; Zhuyin Shao^a ; Guang Tian^a ; Dong Zhou^a ; ^b ; Honglin Du^a ; Shunquan Liu^a ; Jingzhi Han^a ; Changsheng Wang^a ; Jing Xu^c ; Dunbo Yu^c ; Yingchang Yang^a ; Jinbo Yang^a ; ^d ; ^{jbyang@pku.edu.cn}
• 关键词：Crystal and magnetic structure ; Neutron powder diffraction ; Site disordering effect ; Ferrimagnetic interaction
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：6-10
• 全文大小：1131 K
• 卷排序：129

文摘

A D022-type super structure with a formula Mn6‐yGa2+y (0 ≤ y ≤ 1.64) is proposed to describe the structural evolution of tetragonal Mn3‐xGa (0 ≤ x ≤ 1.8) intermetallic compounds. Degree of site disorder is obtained based on the 2b-site Mn and 2a-site Ga disordering model. Neutron data refinement indicates that the structure transforms from a completely ordered state (y = 0) to the 2a and 2b sites (Mn-Ga) disordered state (y > 0.92) with increasing y. The ferrimagnetic ordering structure between Mn (4d) and Mn (2a/2b) has been established, with the magnetic moment retaining almost 2.2 μB and ranging from − 3.3 μB (y → 0) to − 2.3 μB (y → 1.64), respectively.