The Low‐Temperature Sintering Mechanism of
Hexaferrite Using the Addition of Sr
We have investigated the sintering behavior of
hexaferrite ( Sr 12 SrFe 19) and the effects of adding O , which partly substituted for the CuO
2 Fe 3 and the O deficiency during the sintering. For the experiments, samples with nominal
compositions of Fe
Fe 19−δ (x = 0–1.0, y = 11–12)
were prepared with a solid‐state reaction at 1000°C. The overall shrinkages and the shrinkage rates were followed using dilatometry during the sintering. The addition of O was found to enhance the sintering rate of the CuO hexaferrite significantly at temperatures below 1100°C, whereas the Sr
deficiency had only a moderate effect on the sintering above 1100°C. The relative densities of the Fe hexaferrite
ceramics containing Sr sintered at 1000°C for 3 h were above 90%, whereas the Cu ‐free Cu hexaferrite ceramics only started to sinter at 1000°C.
We have shown that the addition of Sr enabled the reactive liquid‐phase sintering of CuO hexaferrite at 1000°C.
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Document Type: Research Article
Publication date: October 1, 2012