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The solid solution Gd2NixCu2-xMg: Large reversible magnetocaloric effect and a drastic change of the magnetism by substitution

Linsinger, Stefan ; Hermes, Wilfried LU ; Eul, Matthias and Poettgen, Rainer (2010) In Applied Physics Reviews 108(4).
Abstract
Various samples of the solid solution Gd2NixCu2-xMg were synthesized from the elements in sealed tantalum ampoules in an induction furnace. All members crystallize with the tetragonal Mo2FeB2 type structure, space group P4/mbm, and they were characterized on the basis of Guinier powder patterns and energy dispersive X-rays analyses. The lattice parameters decrease with increasing nickel content in a Vegard-like manner. The Gd2NixCu2-xMg samples show Curie Weiss behavior with slightly higher magnetic moment values than the theoretical one for a free Gd3+ ion. The substitution of copper by nickel has a drastic influence on the magnetism and magnetic ordering temperature. For Gd2Ni0.5Cu1.5Mg a temperature induced FM -> AFM order-to-order... (More)
Various samples of the solid solution Gd2NixCu2-xMg were synthesized from the elements in sealed tantalum ampoules in an induction furnace. All members crystallize with the tetragonal Mo2FeB2 type structure, space group P4/mbm, and they were characterized on the basis of Guinier powder patterns and energy dispersive X-rays analyses. The lattice parameters decrease with increasing nickel content in a Vegard-like manner. The Gd2NixCu2-xMg samples show Curie Weiss behavior with slightly higher magnetic moment values than the theoretical one for a free Gd3+ ion. The substitution of copper by nickel has a drastic influence on the magnetism and magnetic ordering temperature. For Gd2Ni0.5Cu1.5Mg a temperature induced FM -> AFM order-to-order transition was observed, whereas Gd2Ni1.0Cu1.0Mg is a metamagnet with H-Cr of about 8 kOe at 5 K. For both compounds, a large reversible magnetocaloric effect (MCE) near their ordering temperatures occurs. The values of the maximum magnetic entropy change -Delta S-M(max) reach 9.5 and 11.4 J kg(-1) K-1 for the field change of 5 T with no obvious hysteresis loss around 65 K for Gd2Ni0.5Cu1.5Mg and Gd2Ni1.0Cu1.0Mg, respectively. The corresponding relative cooling power with 688 and 630 J kg(-1) is relatively high as compared to other MCE materials in that temperature range. These results indicate that Gd2NixCu2-xMg could be a promising system for magnetic refrigeration at temperatures below liquid N-2. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3466775] (Less)
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publishing date
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Contribution to journal
publication status
published
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in
Applied Physics Reviews
volume
108
issue
4
publisher
American Institute of Physics (AIP)
external identifiers
  • wos:000281857100076
  • scopus:77956327306
ISSN
1931-9401
DOI
10.1063/1.3466775
language
English
LU publication?
yes
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The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Polymer and Materials Chemistry (LTH) (011001041)
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8a2b9b3f-091f-4fbd-8fe4-5a9012bb0ef5 (old id 1695915)
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2016-04-01 10:05:59
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2022-03-27 04:51:04
@article{8a2b9b3f-091f-4fbd-8fe4-5a9012bb0ef5,
  abstract     = {{Various samples of the solid solution Gd2NixCu2-xMg were synthesized from the elements in sealed tantalum ampoules in an induction furnace. All members crystallize with the tetragonal Mo2FeB2 type structure, space group P4/mbm, and they were characterized on the basis of Guinier powder patterns and energy dispersive X-rays analyses. The lattice parameters decrease with increasing nickel content in a Vegard-like manner. The Gd2NixCu2-xMg samples show Curie Weiss behavior with slightly higher magnetic moment values than the theoretical one for a free Gd3+ ion. The substitution of copper by nickel has a drastic influence on the magnetism and magnetic ordering temperature. For Gd2Ni0.5Cu1.5Mg a temperature induced FM -> AFM order-to-order transition was observed, whereas Gd2Ni1.0Cu1.0Mg is a metamagnet with H-Cr of about 8 kOe at 5 K. For both compounds, a large reversible magnetocaloric effect (MCE) near their ordering temperatures occurs. The values of the maximum magnetic entropy change -Delta S-M(max) reach 9.5 and 11.4 J kg(-1) K-1 for the field change of 5 T with no obvious hysteresis loss around 65 K for Gd2Ni0.5Cu1.5Mg and Gd2Ni1.0Cu1.0Mg, respectively. The corresponding relative cooling power with 688 and 630 J kg(-1) is relatively high as compared to other MCE materials in that temperature range. These results indicate that Gd2NixCu2-xMg could be a promising system for magnetic refrigeration at temperatures below liquid N-2. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3466775]}},
  author       = {{Linsinger, Stefan and Hermes, Wilfried and Eul, Matthias and Poettgen, Rainer}},
  issn         = {{1931-9401}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Institute of Physics (AIP)}},
  series       = {{Applied Physics Reviews}},
  title        = {{The solid solution Gd2NixCu2-xMg: Large reversible magnetocaloric effect and a drastic change of the magnetism by substitution}},
  url          = {{http://dx.doi.org/10.1063/1.3466775}},
  doi          = {{10.1063/1.3466775}},
  volume       = {{108}},
  year         = {{2010}},
}