Magnetocaloric effect and critical behavior in Ni2In-type compound FeMn1−Ni Ge

Autor:	Sheng Yu, Jian Zhang, Jinzhi Wang, Fang Wang, Tangfu Feng, Renbing Sun
Rok vydání:	2015
Předmět:	Phase transition Materials science Condensed matter physics Mechanical Engineering Exchange interaction Metals and Alloys Partial substitution Atmospheric temperature range Magnetization Paramagnetism Ferromagnetism Mechanics of Materials Materials Chemistry Magnetic refrigeration
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:	https://explore.openaire.eu/search/publication?articleId=doi_________::5278f95460ee037983359e338ed283b5 https://doi.org/10.1016/j.jallcom.2015.03.154 Zobrazit plný text záznamu Full Text from ScienceDirect