Magnetocaloric Effect of Rare Earth Nitrides

Author

Hirayama, Yusuke ; Nakagawa, Takashi ; Kusunose, Takafumi ; Yamamoto, Takao A.

Author_Institution

Grad. Sch. of Eng., Osaka Univ., Suita

Volume

44

Issue

11

fYear

2008

Firstpage

2997

Lastpage

3000

Abstract

Dy_0.5Ho_0.5N, Tb_0.5Dy_0.5N, and Tb_0.5Gd_0.5N were synthesized using two methods, carbothermic reduction and hot isostatic pressing, and their magnetocaloric effects were evaluated. The magnetization and specific heat of the nitrides were measured, and the magnetic entropy change DeltaS, adiabatic temperature change DeltaT and relative cooling power RCP were calculated. Values of RCP for the rare earth nitrides were larger than those of intermetallic compounds so far reported. The rare earth nitrides are promising magnetic refrigerant materials for hydrogen liquefaction systems working below liquid nitrogen temperatures.

Keywords

dysprosium compounds; entropy; gadolinium compounds; holmium compounds; hot pressing; liquefaction; magnetic cooling; magnetisation; magnetocaloric effects; specific heat; terbium compounds; Dy_0.5Ho_0.5N; Tb_0.5Dy_0.5N; Tb_0.5Gd_0.5N; adiabatic temperature change; carbothermic reduction; cooling power RCP; hot isostatic pressing; hydrogen; intermetallic compounds; liquid nitrogen temperatures; magnetic entropy change; magnetic refrigerant materials; magnetization; magnetocaloric effect; rare earth nitrides; specific heat; Magnetocaloric effect; nitride; rare earth; specific heat;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2008.2002586

Filename

4717772