Investigation on the magnetocaloric effect in RNi2 (R: Dy, tb) melt-spun ribbon

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:412

Article

de Souza, M. V.¹ 

[1] Univ Fed Sergipe, Dept Fis, BR-49100000 Cristovao, Sergipe, Brazil

关键词: Magnetocaloric effect;    Anisotropy;    Melt-spun ribbon;    Composite;   

DOI  :  10.1016/j.jmmm.2016.03.078

来源: Elsevier

【 摘 要 】

We report a theoretical and experimental investigation on the magnetocaloric properties of the rare earth RNi2 (R=Dy,Tb) in melt-spun ribbon and bulk form. The theoretical calculations were performed using a Hamiltonian model including the Zeeman-exchange interactions and the crystalline electrical field. Thus the magnetocaloric potential was calculated in the easy magnetic axes, in order an average over all of the possible directions. The isothermal entropy-change dependence on temperature calculated was compared with available experimental data for melt-spun ribbon and bulk material. We also investigated, theoretically and experimentally, the behavior of a DyNi2 and TbNi2 composite with optimized molar proportions and discussed this in the context of the optimum regeneration Ericsson cycle. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free