Abstract
The effects of substitution of Zr and Ga on the structural and magnetic properties of Dy2Fe17 intermetallic compound were investigated in this study. The Rietveld analysis confirmed that the crystalline system was a Th2Ni17 structure. Lattice parameters a (Å) and c (Å), unit cell volume (Å3), and bonding distance (Å) were calculated using Rietveld analysis. The unit cell volume of Dy2Fe17−xZrx and Dy2Fe16Ga1−xZrx increased linearly with Zr and Ga substitution. The Curie temperature (Tc) of Dy2Fe17−xZrx and Dy2Fe16Ga1−xZrx was found to be Zr content-dependent. The maximum Curie temperatures were observed at 510 K (x = 0.75 Zr content) for Dy2Fe17−xZrx and 505.1 K (x = 0.5 Zr content) for Dy2Fe16Ga1−xZrx, which are 102 K and 97 K higher than the value found for Dy2Fe17, respectively. The room-temperature Mössbauer 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–Ga substitution in 2:17 intermetallic compounds could find potential use of these magnetic compounds in high-temperature applications.
Highlights
Intermetallic compounds (rare-earth elements (R) and 3d-transition elements (T)) possess outstanding magnetic properties because of their high saturation magnetization (Ms)
The effects of substitution of Ga and Zr in intermetallic compounds Dy2Fe17 prepared via arc melting were carefully studied
This increase in the Curie temperature was attributed to an enhancement in Fe–Fe positive exchange interaction
Summary
Intermetallic compounds (rare-earth elements (R) and 3d-transition elements (T)) possess outstanding magnetic properties because of their high saturation magnetization (Ms). Many studies were done to improve the Curie temperatures of Dy2Fe17 [2,3,4] either by replacing the Fe atoms with non-magnetic atoms (Al, Si, Ga) [5] or by doping refractory atoms (Ti, V, Mo, Nb, W, Zr) in the Fe site [6,7,8,9,10]. The introduction of nitrogen on interstitial sites of R2Fe17Nx increased the Curie temperature This happens because the unit cell volume expansion increases the distance between iron atoms with a greater degree of exchange interaction [19,20]. Doping of Zr and Ga atoms can increase the lattice parameters a and c, as well as the unit cell volume, and improve the Fe–Fe exchange interaction. The dysprosium element was chosen as it has a high Bohr magneton value (10.63 μB), which brings enhancement in the magnetic properties of the intermetallic compound
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