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Large reversible magnetocaloric effect due to a rather unstable antiferromagnetic ground state in Er4NiCd

Hermes, Wilfried LU ; Rodewald, Ute Ch. and Poettgen, Rainer (2010) In Applied Physics Reviews 108(11).
Abstract
Er4NiCd crystallizes with the Gd4RhIn type structure, space group F (4) over bar 3m, a=1333.3 pm. The nickel atoms have trigonal prismatic rare earth coordination. Condensation of the NiEr6 prisms leads to a three-dimensional network which leaves voids that are filled by regular Cd-4 tetrahedra. Er4NiCd shows Curie-Weiss behavior above 50 K with T-N=5.9 K. At field strength of 4 kOe a metamagnetic step is visible, together with the positive paramagnetic Curie-temperature (7.5 K) indicative for the rather unstable antiferromagnetic ground state. Therefore, a large reversible magnetocaloric effect (MCE) near the ordering temperature occurs and the values of the maximum magnetic-entropy change -Delta S-M(max) reach 18.3 J kg(-1) K-1 for the... (More)
Er4NiCd crystallizes with the Gd4RhIn type structure, space group F (4) over bar 3m, a=1333.3 pm. The nickel atoms have trigonal prismatic rare earth coordination. Condensation of the NiEr6 prisms leads to a three-dimensional network which leaves voids that are filled by regular Cd-4 tetrahedra. Er4NiCd shows Curie-Weiss behavior above 50 K with T-N=5.9 K. At field strength of 4 kOe a metamagnetic step is visible, together with the positive paramagnetic Curie-temperature (7.5 K) indicative for the rather unstable antiferromagnetic ground state. Therefore, a large reversible magnetocaloric effect (MCE) near the ordering temperature occurs and the values of the maximum magnetic-entropy change -Delta S-M(max) reach 18.3 J kg(-1) K-1 for the field change of 5 T with no obvious hysteresis loss around 17 K. The corresponding RCP of 595 J kg(-1) is relatively high as compared to other MCE materials in that temperature range. These results indicate that Er4NiCd could be a promising system for magnetic refrigeration at temperatures below liquid H-2. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3518556] (Less)
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publication status
published
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in
Applied Physics Reviews
volume
108
issue
11
publisher
American Institute of Physics
external identifiers
  • wos:000285474100090
  • scopus:78751483486
ISSN
0021-8979
DOI
10.1063/1.3518556
language
English
LU publication?
yes
id
74331067-254c-432f-81b1-a0f41bfe6c91 (old id 1868074)
date added to LUP
2011-04-20 08:23:47
date last changed
2018-07-01 03:01:06
@article{74331067-254c-432f-81b1-a0f41bfe6c91,
  abstract     = {Er4NiCd crystallizes with the Gd4RhIn type structure, space group F (4) over bar 3m, a=1333.3 pm. The nickel atoms have trigonal prismatic rare earth coordination. Condensation of the NiEr6 prisms leads to a three-dimensional network which leaves voids that are filled by regular Cd-4 tetrahedra. Er4NiCd shows Curie-Weiss behavior above 50 K with T-N=5.9 K. At field strength of 4 kOe a metamagnetic step is visible, together with the positive paramagnetic Curie-temperature (7.5 K) indicative for the rather unstable antiferromagnetic ground state. Therefore, a large reversible magnetocaloric effect (MCE) near the ordering temperature occurs and the values of the maximum magnetic-entropy change -Delta S-M(max) reach 18.3 J kg(-1) K-1 for the field change of 5 T with no obvious hysteresis loss around 17 K. The corresponding RCP of 595 J kg(-1) is relatively high as compared to other MCE materials in that temperature range. These results indicate that Er4NiCd could be a promising system for magnetic refrigeration at temperatures below liquid H-2. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3518556]},
  articleno    = {113919},
  author       = {Hermes, Wilfried and Rodewald, Ute Ch. and Poettgen, Rainer},
  issn         = {0021-8979},
  language     = {eng},
  number       = {11},
  publisher    = {American Institute of Physics},
  series       = {Applied Physics Reviews},
  title        = {Large reversible magnetocaloric effect due to a rather unstable antiferromagnetic ground state in Er4NiCd},
  url          = {http://dx.doi.org/10.1063/1.3518556},
  volume       = {108},
  year         = {2010},
}