期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 8, 页码 3452-3456出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.12.088
关键词
Intermetallics; Magnetocaloric effect; Magnetic measurements
资金
- FAPESP - Fundacao de Amparo a Pesquisa do Estado de Sao Paulo
- CNPq - Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- FAPERJ - Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro and Fundacao Araucaria (PR)
The determination of the isothermal variation of the entropy (Delta S-T) is discussed in the present work We show that Delta S-T has very different profiles and magnitudes when calculated from M vs. H or M vs. T experimental data. For MnAs compound, Delta S-T A obtained from M vs. T data does not present a colossal peak This result and the agreement between theoretical and experimental non-colossal magnetocaloric effect indicate that the colossal peak may be miscalculated from M vs. H experimental data. For Gd5Ge2Si2 compound, Delta S-T obtained from M vs. T data does not present the peak observed in Delta S-T from M vs. H data. (c) 2011 Elsevier B.V. All rights reserved.
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