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Stoichiometric mixtures of FeO and Y2O3 were milled and heat treated to obtain yttrium iron garnet, Y3Fe5O12.
Two types of heating systems were used: one, a spark plasma sintering machine
and the second, an electrical oven. The magnetic properties of the resulting
specimens have been analyzed and discussed as a function of the grain size and
the particles’ morphology. The partial formation of garnet and orthoferrite
phases was revealed on the obtained powder through microstructural analyses
after 9 h of ball milling. The milled powders were transformed into the orthoferrite
phase after the SPS-treatment at 700°C and 900°C. Magnetic-saturation studies
revealed magnetic responses up to 12.7 emu/g for specimens SPS-treated at 700°C,
whereas 2.1 emu/g for samples SPS-treated at 900°C. Conventionally treated
specimens at 700°C developed 0.36 emu/g of magnetization, while 0.93 emu/g was
registered for those treated at 900°C.