| Summary: | The effects of substitution of Zr and Ga on the structural and magnetic properties of Dy<sub>2</sub>Fe<sub>17 </sub>intermetallic compound were investigated in this study. The Rietveld analysis confirmed that the crystalline system was a Th<sub>2</sub>Ni<sub>17</sub> structure. Lattice parameters <i>a</i> (Å) and <i>c</i> (Å), unit cell volume (Å<sup>3</sup>), and bonding distance (Å) were calculated using Rietveld analysis. The unit cell volume of Dy<sub>2</sub>Fe<sub>17−x</sub>Zr<sub>x</sub> and Dy<sub>2</sub>Fe<sub>16</sub>Ga<sub>1−x</sub>Zr<sub>x</sub> increased linearly with Zr and Ga substitution. The Curie temperature (Tc) of Dy<sub>2</sub>Fe<sub>17−x</sub>Zr<sub>x</sub> and Dy<sub>2</sub>Fe<sub>16</sub>Ga<sub>1−x</sub>Zr<sub>x</sub> was found to be Zr content-dependent. The maximum Curie temperatures were observed at 510 K (<i>x</i> = 0.75 Zr content) for Dy<sub>2</sub>Fe<sub>17−x</sub>Zr<sub>x</sub> and 505.1 K (<i>x</i> = 0.5 Zr content) for Dy<sub>2</sub>Fe<sub>16</sub>Ga<sub>1−x</sub>Zr<sub>x</sub>, which are 102 K and 97 K higher than the value found for Dy<sub>2</sub>Fe<sub>17</sub>, 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.
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