Effects of Pr substitution on the hydrogenating process and magnetocaloric properties of La1-xPrxFe11.4Si1.6Hy hydrides

doi:10.1088/1674-1056/26/6/067502

Abstract In this paper, we study the effects of Pr substitution on the hydrogenating process and magnetocaloric properties of La_1-xPr_xFe_11.4Si_1.6H_y hydrides. The powder x-ray diffraction patterns of the La_1-xPr_xFe_11.4Si_1.6 and its hydrides show that each of the alloys is crystallized into the single phase of cubic NaZn₁₃-type structure. There are hydrogen-absorbing plateaus under 0.4938 MPa and 0.4882 MPa in the absorbing curves for the La_0.8Pr_0.2Fe_11.4Si_1.6 and La_0.6Pr_0.4Fe_11.4Si_1.6 compounds. The releasing processes lag behind the absorbing process, which is obviously different from the coincidence between absorbing and releasing curves of the LaFe_11.4Si_1.6 compound. The remnant hydrogen content for La_0.6Pr_0.4Fe_11.4Si_1.6 is significantly more than that for La_0.8Pr_0.2Fe_11.4Si_1.6 after hydrogen desorption, indicating that more substitutions of Pr for La are beneficial to retaining more hydrogen atoms in the alloys. The values of maximum magnetic entropy change are 14.91 J/kg·K and 17.995 J/kg·K for La_0.8Pr_0.2Fe_11.4Si_1.6H_0.13 and La_0.6Pr_0.4Fe_11.4Si_1.6H_0.87, respectively.

Keywords: La (Fe Si)₁₃ compounds hydrogenating process magnetocaloric effect magnetic refrigeration materials

Received: 16 November 2016
Revised: 14 March 2017
Accepted manuscript online:

PACS:	75.30.Sg	(Magnetocaloric effect, magnetic cooling)
	75.50.-y	(Studies of specific magnetic materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51301008 and 51171003) and the Beijing Natural Science Foundation, China (Grant No. 1112005).

Corresponding Authors: Jin-Liang Zhao, Ming Yue
E-mail: zhaojingliang@bjut.edu.cn;yueming@bjut.edu.cn

Cite this article:

Lei Xu(许磊), Jin-Liang Zhao(赵金良), Jing-Jie Yang(杨静洁), Hong-Guo Zhang(张红国), Dan-Min Liu(刘丹敏), Ming Yue(岳明), Yi-Jian Jang(蒋毅坚) Effects of Pr substitution on the hydrogenating process and magnetocaloric properties of La_1-xPr_xFe_11.4Si_1.6H_y hydrides 2017 Chin. Phys. B 26 067502

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Effects of Pr substitution on the hydrogenating process and magnetocaloric properties of La1-xPrxFe11.4Si1.6Hy hydrides

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Effects of Pr substitution on the hydrogenating process and magnetocaloric properties of La_1-xPr_xFe_11.4Si_1.6H_y hydrides