Study of the first paramagnetic to ferromagnetic transition in as prepared samples of Mn-Fe-P-Si magnetocaloric compounds prepared by different synthesis routes

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:400

Article; Proceedings Paper

Bartok, A.¹  Kustov, M.²  Cohen, L. F.²  Pasko, A.¹  Zehani, K.³  Bessais, L.³  Mazaleyrat, F.¹  LoBue, M.¹ 

[1] Univ Paris Saclay, ENS Cachan, SATIE, CNRS, F-94230 Cachan, France

[2] Univ London Imperial Coll Sci Technol & Med, London SW7 2AZ, England

[3] CNRS, UPEC, CMTR, ICMPE, F-94320 Thiais, France

关键词: Magnetocaloric effect;    Magnetic refrigeration;    First-order magnetic transition;    Magnetic entropy change;    Fe2P-based compounds;    Spark plasmas intering;   

DOI  :  10.1016/j.jmmm.2015.08.045

来源: Elsevier

【 摘 要 】

Magnetocaloric materials with composition of Mn1.3Fe0.6Si0.5 Si-0.(5) have been prepared by ball milling and solid-state reaction methods and consolidated using powder annealing, and conventional and spark plasma sintering. Magnetic and calorimetric measurements show remarkable differences upon first cooling, and slight differences on second and further coolings between the samples prepared by different synthesis routes. Further measurements using Hall probe imaging in high magnetic field have been also carried out. As-prepared samples have been cooled down just above the critical temperature, and the first phase transition has been induced by application of a magnetic field. Bulk samples show staircase isothermal magnetization curves whereas powders show smoother transition curves. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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