焼成雰囲気がMgZnフェライトの粒成長に及ぼす影響 [in Japanese] Effect of Oxygen Partial Pressure during Firing on Grain Growth Behavior in MgZn Ferrite [in Japanese]
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The excess of Fe<SUB>2</SUB>O<SUB>3</SUB> in MgZn ferrite sintered in air easily results in a discontinuous grain growth. On the other hand, ferrites with a deficiency of Fe<SUB>2</SUB>O<SUB>3</SUB> in the stoichiometry tend to produce a uniform microstructure irrespective of the sintering atmosphere. The firing at low Po<SUB>2</SUB> is highly effective in suppressing the discontinuous grain growth, and it precipitates the magnesiowustite accompanying the inhibition of grain growth. Highly pure ferrites with excess Fe<SUB>2</SUB>O<SUB>3</SUB> never stimulate any discontinuous grain growth and result in a uniform microstructure. The formation of precipitates and liquid phase is correlation to the extent of the grain growth behavior of MgZn ferrite.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 46(1), 92-97, 1999-01-15
Japan Society of Powder and Powder Metallurgy