고에너지볼밀링을 이용한 MnFeP1-xAsx 나노분말의 합성
Synthesis of MnFeP1-xAsx Nanocrystalline Powders by High-Energy Ball Milling
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Abstract
Nanocrystalline powders of MnFeP1-xAsx (x=0.45-0.6) have been synthesized by mechanochemical reaction at room temperature using high-energy ball milling from mixtures of Mn, Fe, P, and As powders. It has been found that a mechanically induced self-propagating reaction (MSR) occurs within 2 hours of milling and it produces very fine polycrystalline powder having a hexagonal Fe2P structure. Further milling up to 24 hours did not change the crystalline and average particle sizes or the phase composition of the milling product. When x is 0.65, no reaction among the reactants has been observed even after 24 hours of milling. As the P content decreases in MnFeP1-xAsx, the incubation time for the MSR has increased and the lattice constants in both a and c axes have changed.