Two-Step Sintering of Ceramics with Constant Grain-Size, II: BaTiO3and Ni–Cu–Zn Ferrite

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Wang, X.-H.
Deng, X.-Y.
Bai, Hai-Lin
Zhou, H.
Qu, Wei-Guo
Li, L.-T.
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We investigated the preparation of bulk dense nanocrystalline BaTiO3 and Ni–Cu–Zn ferrite ceramics using an unconventional two-step sintering strategy, which offers the advantage of not having grain growth while increasing density from about 75% to above 96%. Using nanosized powders, dense ferrite ceramics with a grain size of 200 nm and BaTiO3 with a grain size of 35 nm were obtained by two-step sintering. Like the previous studies on Y2O3, the different kinetics between densification diffusion and grain boundary network mobility leaves a kinetic window that can be utilized in the second-step sintering. Evidence indicates that low symmetry, ferroelectric structures still exist in nanograin BaTiO3 ceramics, and that saturation magnetization is the same in nanograin and coarse grain ferrite ceramics.

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2006-02-01
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Copyright The American Ceramic Society. Reprinted from Journal of the American Ceramic Society, Volume 89, Issue 2, February 2006, pages 438-443.
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