In this paper, ferroelectric PbTiO3 (PT) ultrafine powders with nanosized grains are prepared through sol-gel and hydrolysis-aging process. The lattice constants and grain size are determined by XRD analysis. The phase transition is examined by DSC and Second Harmonic Generation (SHG) measurements. The relation between onset temperature of phase transition and grain size is obtained. Results indicate that the phase transition of nanosized PT powder is broadened. The mechanism of broadened phase transition is discussed.
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Lu et al. (1994) studied this question.
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