Review on the influence of hydrogen on the magnetism of alloys based on rare earth-transition metal systems
Review on the influence of hydrogen on the magnetism of alloys based on rare earth-transition metal systems
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DOI：
10.1016/s0921-4526(02)00816-5
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发表时间：
2002-08-01
影响因子：
2.8
通讯作者：
Pourarian, F
中科院分区：
文献类型：
--
作者：
Pourarian, F
在过去的三十年里，人们对金属氢化物的磁性进行了广泛的研究。金属和金属间化合物的氢化经常导致它们的电磁特性发生显着变化，并导致一些不寻常的新特征。在含有过渡金属的材料中，氢对磁性的影响是双重的：首先，从能带结构的角度来看，由于氢只贡献两个态而只有一个电子，费米能级，从而影响了过渡金属的磁矩。其次，吸氢导致晶格尺寸增大，从而影响磁性离子之间相互作用的强度。在金属间化合物Th7Fe3H30中观察到最显著的吸氢效应之一，在这种情况下，母体材料是超导体，但氢化后它变成了磁性有序的。基于R6T23(R=稀土，T=Mn，Fe)的化合物在氢化过程中表现出显著的磁性结构变化。例如，在氢化过程中，Y6Mn23从亚铁磁体转变为反铁磁体。综述了氢对结构类型为RT2、RT3、R6T23、R6T13B和R6T13X的稀土过渡金属基金属间化合物(R=稀土，T=Fe，Co或Mn，X=元素周期表中第三、第四和第五族元素)磁性和晶体结构的影响。(C)2002 Elsevier Science B.V.保留所有权利。
Extensive studies of the magnetism of metal hydrides have been carried out in the last three decades. Hydrogenation of metals and intermetallic compounds frequently results in a striking alteration of their electronic and magnetic characteristics and leads to some extraordinary new features. In materials which contain a transition metal, the effect of hydrogen on the magnetic properties is twofold: Firstly, from the band structure point view, since hydrogen contributes two states and only one electron, the Fermi level, and hence the transition metal magnetic moment, is affected. Secondly hydrogen absorption results in increased lattice dimensions, which influences the strength of the interaction between magnetic ions. One of the most striking effects of hydrogen absorption is observed in the intermetallic compounds Th7Fe3H30, In this instance, the parent material is a superconductor, but upon hydrogenation it becomes magnetically ordered. The class of compounds based on R6T23 (R = rare earth, T = Mn, Fe) has shown dramatic magnetic structure change upon hydrogenation. For example, on hydrogenation, Y6Mn23 transforms from a ferrimagnet to an antiferromagnet.The influence of hydrogen on the magnetic properties and crystal structure of rare earth-transition metal-based intermetallic compounds with RT2, RT3, R6T23, R6T13B and R6T13X structure type (R. = rare earth, T = Fe, Co or Mn and X = the third, fourth and fifth group of elements in the periodic table) is reviewed. (C) 2002 Elsevier Science B.V. All rights reserved.