首页|Indium segregation in Gd-5(Si, Ge)(4) magnetocaloric materials

Indium segregation in Gd-5(Si, Ge)(4) magnetocaloric materials

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  • NSTL
  • Elsevier
Chemical substitution is one of the most efficient tools to tune and optimize magnetic and magnetocaloric properties of the giant magnetocaloric materials. In particular, Indium substitutions could be useful both for tuning properties of these interesting intermetallic materials and to unveil their local-scale behavior across the magnetostructural transition via hyperfine techniques. Hence, in order to investigate the effect of Indium additions on the crystal structure, micro-structure, magnetic and magnetocaloric properties, a series of In-containing samples derived from the base Gd5Si1.2Ge2.8 stoichiometry were prepared. The major findings are that while In is insoluble in the 5: 4 phase, it will instead promote the emergence of the impurity 5: 3 phase and segregates into this phase. Hence, In leads to major crystallographic changes, which enhance atomic disorder and disrupt the Si to Ge ratio in the 5: 4 phase. Subsequently, a higher 5: 4 unit cell volume and a lower magnetic ordering temperature are found in the In-substituted samples. Finally, the magnetocaloric properties of the In-substituted samples reveal a detrimental effect on the maximum magnetic entropy change. (C) 2021 Elsevier B.V. All rights reserved.

MagnetocaloricRare earth alloys and compoundsPhase diagramsPhase transitionsScanning electron microscopySEMMagnetic measurementsChemical substitutionMetal alloysCRYSTAL-STRUCTUREGD-5(SIXGE1-X)(4)GD5SI2GE2GDREFRIGERATIONTRANSITIONFEATURESALLOYSTBGE

Belo, J. H.、Mudryk, Y.、Pereira, A. M.、Oliveira, G. N. P.、Lopes, A. M. L.、Paudyal, D.、Morellon, L.、Algarabel, P. A.、Magen, C.、Marcano, N.、Pecharsky, V. K.、Araujo, J. P.

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Univ Porto

Iowa State Univ

CSIC Univ Zaragoza

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2022

10.1016/j.jallcom.2021.162245

Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN：0925-8388
年,卷(期)：2022.893
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