Magnetic ordering of Ho6Co2Ga-type {Gd, Tb, Dy}6Co2.2 Al0.8 and Tb6Co2Al compounds by magnetization and neutron diffraction study

被引：8
作者：
Morozkin, A., V [1 ]
Garshev, A., V [1 ,2 ]
Yapaskurt, V. O. [3 ]
Yao, Jinlei [4 ]
Quezado, S. [5 ]
Malik, S. K. [5 ]
Isnard, O. [6 ,7 ]
机构：
[1] Moscow MV Lomonosov State Univ, Dept Chem, House 1,Bldg 3,GSP 2, Moscow 119991, Russia
[2] Moscow MV Lomonosov State Univ, Fac Mat Sci, House 1,Bldg 73,GSP, Moscow 119991, Russia
[3] Moscow MV Lomonosov State Univ, Dept Petrol, Geol Fac, Moscow 119992, Russia
[4] Suzhou Univ Sci & Technol, Sch Math & Phys, Jiangsu Key Lab Micro & Nano Heat Fluid Flow Tech, Suzhou 215009, Peoples R China
[5] Univ Fed Rio Grande do Norte, Dept Fis Teor & Expt, BR-59082970 Natal, RN, Brazil
[6] Inst Neel, CNRS, 25 Rue Martyrs BP166 X, F-38042 Grenoble, France
[7] Univ Grenoble Alpes, Inst Neel, F-38042 Grenoble, France
来源：
INTERMETALLICS | 2019年 / 113卷
基金：
中国国家自然科学基金;
关键词：
Rare-earth compounds; Crystal structure; Magnetic properties; Magnetocaloric effect: neutron diffraction; study: magnetic structure; CRYSTAL-STRUCTURE; GD; HO; TM; ER; R=Y; RE; DY;
D O I：
10.1016/j.intermet.2019.106588
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The magnetic ordering of polycrystalline Ho6Co2Ga-type Gd6Co2.2Al0.8, Tb6Co2.2Al0.8, Tb6Co2Al and Dy6Co2.2Al0.8 (space group Immm, N 71, oI36) has been established using magnetic measurements and the magnetic structure of Tb6Co2.2Al0.8 has been resolved by the neutron diffraction study. Gd6Co2.2Al0.8 exhibits field sensitive ferro-antiferromagnetic ordering, meanwhile Tb6Co2.2Al0.8, Tb6Co2Al and Dy6Co2.2Al0.8 are antiferromagnets with metamagnetic transformation of magnetic ordering. Gd6Co2.2Al0.8 is soft ferromagnet, whereas Tb6Co2.2Al0.8, Tb6Co2Al and Dy6Co2.2Al0.8 exhibit low-temperature weak permanent magnet properties. From these compounds, Gd6Co2.2Al0.8 demonstrates largest magnetocaloric effect with magnetic entropy change of -10.89 J/kg.K at 75 K for a field change of 50 kOe (relative cooling power of similar to 760 J/kg). Neutron diffraction study indicates non-collinear abc-antiferromagnetic ordering of Tb6Co2.2Al0.8 in zero applied magnetic field. Below 63 K and down to 52 K, Tb6Co2.2Al0.8 exhibits antiferromagnetic ordering with magnetic space group I'22'2' (wave vector K-0 = [0, 0, 0]). Below 52 K and down to 1.5 K, the magnetic structure of Tb6Co2.2Al0.8 is sum of magnetic component with P21'212' magnetic space group (wave vector K-0 = [0, 0, 0]) and square-modulated antiferromagnetic component along c-axis of unit cell with K-1 = [+/- 1/4, 0, +/- 1/4] wave vector.
引用
收藏
页数：10
相关论文
共 22 条
  • [11] Legvold S., RARE EARTH METALS AL
  • [12] Levy R., 1968, PRINCIPLES SOLID STA
  • [13] Litvin D.B., 2013, Int. Union Crystallogr., DOI [DOI 10.1107/9780955360220001, /10.1107/9780955360220001]
  • [14] The Gd-Co-Al system at 870/1070 K as a representative of the rare earth Co-Al family and new rare-earth cobalt aluminides: Crystal structure and magnetic properties
    Morozkin, A. V.
    Garshev, A. V.
    Knotko, A. V.
    Yapaskurt, V. O.
    Mozharivskyj, Y.
    Yuan, Fang
    Yao, Jinlei
    Nirmala, R.
    Quezado, S.
    Malik, S. K.
    [J]. JOURNAL OF SOLID STATE CHEMISTRY, 2018, 261 : 62 - 74
  • [15] Magnetic ordering of Mo2NiB2-type {Gd, Tb, Dy)2Co2Al compounds by magnetization and neutron diffraction study
    Morozkin, A. V.
    Genchel, V. K.
    Garshev, A. V.
    Yapaskurt, V. O.
    Isnard, O.
    Yao, Jinlei
    Nirmala, R.
    Quezado, S.
    Malik, S. K.
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2017, 442 : 36 - 44
  • [16] Magnetic and magnetocaloric properties of Ho6Co2Ga-type Dy6Co2.5Sn0.5 compound
    Morozkin, A. V.
    Nirmala, R.
    Malik, S. K.
    [J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2015, 378 : 174 - 177
  • [17] Magnetic structure of Er6Ni2Sn
    Prokes, K.
    Sechovsky, V.
    Syshchenko, O.
    [J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 467 (1-2) : 48 - 53
  • [18] RECENT ADVANCES IN MAGNETIC-STRUCTURE DETERMINATION BY NEUTRON POWDER DIFFRACTION
    RODRIGUEZCARVAJAL, J
    [J]. PHYSICA B, 1993, 192 (1-2): : 55 - 69
  • [19] SICHEVICH OM, 1984, UKR FIZ ZH+, V29, P1342
  • [20] Tishin A.M., 2003, The Magnetocaloric Effect and Its Applications, P480
123