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

E-ISSN： 2100-014x|185|issue|05002-05002

ISSN： 2100-014x

Source： EPJ Web of Conference, Vol.185, Iss.issue, 2018-07, pp. : 05002-05002

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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.