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The Formation of the Structure and Magnetic Properties of Sm₂Fe₁₇C_x Powders with Zn Additives Obtained by Mechanosynthesis

Russian version

Mikheev V.A.¹, Savchenko E.S.¹, Argunov E.V.¹, Novikov A.I.¹, Shchetinin I.V.¹

¹National University of Science and Technology MISiS, Moscow, Russia

Email: vmikheev@misis.ru

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Abstract
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The formation is investigated of the structure and magnetic properties of powders of Sm₂Fe₁₇C_x (a Sm₂Fe₁₇N_x-related compound) with Zn additives obtained by mechanosynthesis. The powders were examined by X-ray diffraction, scanning electron microscopy, and vibrating sample magnetometry. We found that a stage of mechanosynthesis prior to annealing is still necessary for obtaining the compound Sm₂Fe₁₇C_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: Fe₃Zn₁₀ (I43m) and Sm₂Zn₁₇ (R3m) in the annealing temperature range of 350-375 and 400-450 ^oC, respectively. The temperature of active decomposition of the Sm₂Fe₁₇C_x phase for a mixture with Zn was 50 ^oC 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. Keywords: Sm₂Fe₁₇, Sm-Fe-C, Sm₂Fe₁₇C_x, carbon nanotubes, mechanochemical synthesis.

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