Abstract:
In this work, we investigated the formation of the structure and magnetic properties of powders of Sm$_2$Fe$_{17}$C$_x$ (a Sm$_2$Fe$_{17}$C$_x$-related compound) with Zn additives obtained by mechanosynthesis. The powders were investigated by X-ray diffraction, scanning electron microscopy and vibrating sample magnetometry. We found that the stage of mechanosynthesis prior to annealing is still necessary for obtaining the compound Sm$_2$Fe$_{17}$C$_x$ with high hysteresis properties despite the use of carbon nanotubes as a carbon-bearing additive. After annealing, the formation of the following Zn-containing phases was observed: Fe$_3$Zn$_{10}$ (I$\bar4$3m) and Sm$_2$Fe$_{17}$ (R$\bar3$M) in the annealing temperature range of 350–375$^\circ$C and 400–450$^\circ$C, respectively. The temperature of active decomposition of the Sm$_2$Fe$_{17}$C$_x$ phase for a mixture with Zn was 50 degrees higher than that for a mixture without Zn. The increase of annealing temperature enhanced the specific saturation magnetization of the samples but decreased the coercivity.
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