Abstract
Pb 1- x Bi x TiO 3 ( x = 0.0–0.1) compounds were prepared to study the unique dopant effect of bismuth in PbTiO 3. Their thermal expansions and structures were investigated by high-temperature X-ray diffraction and X-ray Rietveld method. The results indicated that Bismuth substitution evidently weakened the tetragonality of PbTiO 3 solid solution, but increased the spontaneous polarization. Both the enhanced spontaneous polarization and the decreased tetragonality led to small volume shrinkage with temperature rising, where the average volumetric thermal expansion coefficient changed from − 1.99 × 10 − 5 /°C for pure PbTiO 3 to − 0.56 × 10 − 5 /°C for Pb 0.90Bi 0.10TiO 3. The Curie point of Pb 1 − x Bi x TiO 3 was slightly raised compared to PbTiO 3 and permitted one to use it in a wide temperature range.
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