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Strontium ferrite with Nd3+, Al3+ and Ca2+ substitution of Fe3+ and Sr2+ ions were prepared by the conventional solid phase reaction process. The Nd3+ substitution shows 10 %–20 % improvement in coercivity for the substitution content less than 10 %. The Ca2+ substitution is favorable to the enhancement of saturation magnetization due to the accelerated reaction of Fe2O3 and SrCO3. The samples with...
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