Synthesis,structure and magnetic properties of Sm_(1.2)Ho_(0.8)Fe_(17)Hx(X=0;4.4)  

作　　者：S.V.Veselova M.A.Paukov I.S.Tereshina V.N.Verbetsky K.V.Zakharov D.I.Gorbunov A.N.VasiPev 

机构地区：[1]Faculty of Physics,M.V.Lomonosov Moscow State University,Moscow 119991,Russia [2]Nuclear Fuel Cycle Department.Centrum Vyzkumu Rez,Hlavni 130,Husinec-Rez 25068.Czech Republic [3]Immanuel Kant Baltic Federal University,Kaliningrad 236004,Russia [4]Faculty of Mathematics and Physics,Charles University,Prague 12116,Czech Republic [5]Hochfeld-Magnetlabor Dresden(HLD-EMFL),Helmholtz-Zentrum Dresden-Rossendorf,Dresden 07328,Germany f National Research South Ural State University,Chelyabinsk 454080,Russia

出　　处：《Journal of Rare Earths》2021年第9期1089-1094,共6页稀土学报（英文版）

基　　金：Project supported by the grant of Russian Science Foundation(project N 18-13-00135);Ministry of Education,Youth and Sport Czech Republic(project LQ1603 Research for SUSEN);the SUSEN Project(established in the framework of the European Regional Development Fund(ERDF)(CZ.1.05/2.1.00/03.0108);of the European Structural and Investment Funds(ESIF)(CZ.02.1.01/0.0/0.0/15_008/0000293);Act 211 of the Government of Russian Federation Contract(02.A03.21.0011).

摘　　要：Intermetallic compounds based on rare-earth metals and iron are by far the most promising materials for permanent mag nets.In this work,the multicomponent compound Sm_(1.2)Ho_(0.8)Fe_(17)was prepared by in duction melting.The hydride Sm_(1.2)Ho_(0.8)Fe_(17)H_(4.4)with a high hydrogen content was obtained by direct hydrogenation of the intermetallic compound.The rhombohedral Th2Zn17-type of structure(space group R3^(-)m)is inhere nt to parent compound and hydride as well.The effect of hydrogenation on the magneric properties of Sm_(1.2)Ho_(0.8)Fe_(17)was investigated.Curie temperature of the hydride Sm_(1.2)Ho_(0.8)-Fe_(17)H_(4.4)is higher than that of parent compound by△Tc=138 K.The hydrogen embedded in Sm_(1.2)Ho_(0.8)Fe_(17)crystal lattice in creases the saturation magnetization(σs)at T=300 K,but does not significantly affect%at T=4.2 K.The ferrimagnetic structure is retained in magnetic fields up to 58 T in the parent compound,while,in the hydride,there is a spin-reorie ntatio n phase transitio n observed at 55 T.It is found that the parameter of the in tersublattice exchange interaction decreases significantly in the hydride Sm_(1.2)Ho_(0.8)Fe_(17)Hg_(4.4)(and in the nitride Sm_(1.2)Ho_(0.8)Fe_(17)N_(2.4))which is associated with boosting of the unit-cell volume and distances between magnetic ions.

关 键 词：Intermetallic compound HYDRIDE Crystal structure MAGNETIZATION Magnetic phase transition Exchange interaction 

分 类 号：TQ133.3[化学工程—无机化工]