Effect of Ga and Zr Substitution on the Properties of Dy 2 Fe 17−X Zr X and Dy 2 Fe 16 Ga 1−x Zr x (0 ≤ x ≤ 1) Intermetallic Compounds Prepared via Arc Melting Process

The effects of substitution of Zr and Ga on the structural and magnetic properties of Dy₂Fe₁₇intermetallic compound were investigated in this study. The Rietveld analysis confirmed that the crystalline system was a Th₂Ni₁₇ structure. Lattice parameters <i>a</i> (&#197;) and <i>c</i> (&#197;), unit cell volume (&#197;³), and bonding distance (&#197;) were calculated using Rietveld analysis. The unit cell volume of Dy₂Fe_17&#8722;xZr_x and Dy₂Fe₁₆Ga_1&#8722;xZr_x increased linearly with Zr and Ga substitution. The Curie temperature (Tc) of Dy₂Fe_17&#8722;xZr_x and Dy₂Fe₁₆Ga_1&#8722;xZr_x was found to be Zr content-dependent. The maximum Curie temperatures were observed at 510 K (<i>x</i> = 0.75 Zr content) for Dy₂Fe_17&#8722;xZr_x and 505.1 K (<i>x</i> = 0.5 Zr content) for Dy₂Fe₁₆Ga_1&#8722;xZr_x, which are 102 K and 97 K higher than the value found for Dy₂Fe₁₇, respectively. The room-temperature M&#246;ssbauer analysis showed a decrease in the average hyperfine field and increases in the isomer shift with Zr doping. The overall improvement in Curie temperature with the substitution strategy of Zr&#8722;Ga substitution in 2:17 intermetallic compounds could find potential use of these magnetic compounds in high-temperature applications.

Abstract licence: CC BY

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