Phase formation and magnetocaloric effect in (Pr,Nd)-Fe alloys prepared by rapidly quenched method

¹ Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi, Viet Nam
² Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi, Viet Nam
³ Hong Duc University, 565 Quang Trung, Dong Ve, Thanh Hoa, Viet Nam
⁴ Kotelnikov Institute of Radio-engineering and Electronics of RAS, Moscow, Russia
⁵ Department of Physics, Chungbuk National University, Cheongju 361 - 763, South Korea

^* Corresponding author: dannh@ims.vast.ac.vn

Published online: 4 July 2018

Abstract

In this work, Pr_2-xNd_xFe₁₇ (x = 0 - 2) ribbons with thickness of about 15 μm were prepared by melt-spinning method. The alloy ribbons were then annealed at different temperatures (900 - 1100°C) for various time (0.25 - 2 h). The formation of the (Pr,Nd)₂Fe₁₇ (2:17) crystalline phase in the alloys strongly depends on the Pr/Nd ratio and annealing conditions. Annealing time for the completed formation of the 2:17 phase in the rapidly quenched ribbons is greatly reduced in comparison with that of bulk alloys. Curie temperature, T_C, of the alloys can be controlled in room temperature region by changing Pr/Nd ratio. Maximum magnetic entropy change (|ΔS_m|_max) and full width at haft the maximum peak (FWHM) of the magnetic entropy change of the alloys were respectively found to be larger than 1.5 J.kg⁻¹K⁻¹ and 40 K in room temperature region with magetic field change ΔH = 12 kOe.