Al2O3-10 wt% Fe composite prepared by high energy ball milling: Structure and magnetic properties
作者： Rafael A Raimundo , Rayanne SS Reinaldo , Nailton T Câmara , Cleber S Lourenço , Franciné A Costa
DOI: 10.1016/J.CERAMINT.2020.08.212
关键词:
摘要: Abstract In the present work, Al2O3-10 wt% Fe composite powders were manufactured by mechanical alloy using different milling times. The morphology, structure and magnetic properties carefully investigated explained through results of SEM, XRD (with Rietveld refinement), Mossbauer spectroscopy measurements at low-temperatures. After 50 h milling, reveal α-Fe particles uniformly distributed in Al2O3 a decrease average particle size Al2O3–Fe composite. Besides, data show crystallite sizes, accompanied an increase lattice micro-strain. For samples milled for 30 h 50 h, spectra recorded 300 K showed superparamagnetic component related to very fine hematite crystallites with maximum absorption relative area 10%. M − H curves 6 K small reduction saturation magnetization, improvement remanence magnetization coercivity field time, while M-T curve sample shows peak 185 K, Morin transition phase.
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