Autor: |
Sheng Yu, Jian Zhang, Jinzhi Wang, Fang Wang, Tangfu Feng, Renbing Sun |
Rok vydání: |
2015 |
Předmět: |
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Zdroj: |
Journal of Alloys and Compounds. 639:259-262 |
ISSN: |
0925-8388 |
Popis: |
Magnetocaloric effect and critical behavior of Ni2In-type compound FeMn1−xNixGe were investigated in the present work. By partial substitution of Ni for Mn in FeMnGe, the magnetic transition temperature (TC) is tuned in a wide temperature range between 160 and 320 K with x (Ni concentration) varying from 0 to 0.4. A ferromagnet (FM) to paramagnet (PM) magnetic phase transition is observed and the magnetization has a sharp drop around respective phase transition temperature for all the compounds. The maximum magnetic entropy change is found to be 3.9 J/kg K and 4.1 J/kg K for a 5 T field change with x = 0.2 and 0.3, respectively, making them a promising candidate for magnetic refrigeration near room temperature. To investigate the nature of PM–FM phase transition, the critical behavior near TC was analyzed based on the Arrott plots. The critical values obtained with the conventional Arrott-plot procedure are very close to those predicated by the mean-field model. This suggests a long-range exchange interaction and a second order magnetic phase transition in FeMn1−xNixGe. |
Databáze: |
OpenAIRE |
Externí odkaz: |
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