Magnetocaloric effect in high-energy ball-milled Gd5Si2Ge2 and Gd5Si2Ge2/Fe nanopowders

被引：24
|
作者：
Rajkumar, D. M. [1 ]
Raja, M. Manivel [1 ]
Gopalan, R. [1 ]
Chandrasekaran, V. [1 ]
机构：
[1] Def Met Res Lab, Hyderabad 500058, Andhra Pradesh, India
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 08期
关键词：
magnetocaloric effect; Gd-Si-Ge-Fe alloys; ball milling; nanopowders; structural transition; magnetic entropy change;
D O I：
10.1016/j.jmmm.2007.12.005
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Evolution of structure and magnetocaloric properties in ball-milled Gd5Si2Ge2 and Gd5Si2Ge2/0.1wt% Fe nanostructured powders were investigated. The high-energy ball-milled powders were composed of very. ne grains (70-80 nm). Magnetization decreased with milling time due to decrease in the grain size and randomization of the magnetic moments at the surface. The magnetic entropy change (Delta S-M) was calculated from the isothermal magnetization curves and a maximum value of 0.45 J/kgK was obtained for 32h milled Gd5Si2Ge2 alloy powder for a magnetic field change of 2T while it was still low in Fe-contained alloy powders. The thermo-magnetic measurements revealed that the milled powders display distribution of magnetic transitions, which is desirable for practical magnetic refrigerant to cover a wide temperature span. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：1479 / 1484
页数：6
相关论文
共 50 条
  • [21] Phase control studies in Gd5Si2Ge2 giant magnetocaloric compound
    Belo, J. H.
    Pereira, A. M.
    Ventura, J.
    Oliveira, G. N. P.
    Araujo, J. P.
    Tavares, P. B.
    Fernandes, L.
    Algarabel, P. A.
    Magen, C.
    Morellon, L.
    Ibarra, M. R.
    JOURNAL OF ALLOYS AND COMPOUNDS, 2012, 529 : 89 - 95
  • [22] Microstructural changes in Fe-doped Gd5Si2Ge2
    Podmiljsak, B.
    Skulj, I.
    Markoli, B.
    Rozman, K. Zuzek
    McGuiness, P. J.
    Kobe, S.
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2009, 321 (04) : 300 - 304
  • [23] Changes in the microstructure of Fe-doped Gd5Si2Ge2
    Skulj, Irena
    McGuiness, Paul
    Podmiljsak, Benjamin
    MATERIALI IN TEHNOLOGIJE, 2008, 42 (03): : 117 - 120
  • [24] Effect of Fe-substitution on microstructure, hysteresis behaviour and magnetocaloric effect in Gd5Si2Ge2 Alloys
    Kumar, D. M. Raj
    Raja, M. Manivel
    Gopalan, R.
    Rao, A. Sambasiva
    Chandrasekaran, V.
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2009, 321 (09) : 1300 - 1305
  • [25] Origin of Magnetic Anisotropy of Gd5Si2Ge2 Compound
    Szymczak, R.
    Kolano, R.
    Kolano-Burian, A.
    Hawelek, L.
    Krzymanska, B.
    Aleshkevich, P.
    Dyakonov, V. P.
    Szymczak, H.
    ACTA PHYSICA POLONICA A, 2012, 121 (5-6) : 1261 - 1262
  • [26] Gd5Si2Ge2 composite for magnetostrictive actuator applications
    Nersessian, N
    Or, SW
    Carman, GP
    McCall, SK
    Choe, W
    Radousky, HB
    McElfresh, MW
    Pecharsky, VK
    Pecharsky, AO
    APPLIED PHYSICS LETTERS, 2004, 84 (23) : 4801 - 4803
  • [27] Forced volume magnetostriction in composite Gd5Si2Ge2
    Nersessian, N
    Or, SW
    Carman, GP
    McCall, S
    Choe, W
    Radousky, HB
    Pecharsky, VK
    Pecharsky, AO
    SMART STRUCTURES AND MATERIALS 2004: ACTIVE MATERIALS: BEHAVIOR AND MECHANICS, 2004, 5387 : 64 - 71
  • [28] Gd5Si2Ge2相的线状缺陷
    付浩
    陈云贵
    张铁邦
    涂铭旌
    中国稀土学报, 2005, (04) : 409 - 413
  • [29] On the high-temperature phase transition of Gd5Si2Ge2
    Mozharivskyj, Y
    Pecharsky, AO
    Pecharsky, VK
    Miller, GJ
    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2005, 127 (01) : 317 - 324
  • [30] Magnetocrystalline Anisotropy in Single Crystal Gd5Si2.7Ge1.3 and Gd5Si2Ge2
    Hadimani, R. L.
    Melikhov, Y.
    Han, M.
    Jiles, D. C.
    IEEE TRANSACTIONS ON MAGNETICS, 2012, 48 (11) : 3989 - 3991
12345