Abstract
Lead titanate (PbTiO₃) powder was prepared from lead nitrate (Pb(NO₃)₂) and titania (TiO₂) by hydrothermal route. Phase formation process was investigated by observing the phases formed in various experimental conditions like different KOH concentration, reaction temperature and time. PbTiO₃ powder was fabricated when the KOH concentration was 0.8M or higher. An intermediate compound, PbTi 0.8 O 2.6 , was formed at first by a reaction between PbO and TiO₂ and changed into PbTiO₃ powder with a perovskite crystal structure. A PbTiO₃ phase was formed in a shorter time when a KOH concentration was increased from 0.8M to 8M because a driving force for a PbTiO₃ formation was increased due to an increase in a degree of supersaturation. And TiO₂(rutile) and 3PbO·H₂O were observed at room temperature in a 0.8M KOH solution and TiO₂(rutile) and PbO (litharge) in a 8M KOH. A PbTiO₃ phase was also formed in a shorter time at a higher reaction temperature as a reaction temperature influenced the rates for a dissolution and a precipitation.
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