PbTiO 3 −Bi(Zn 1/2 Ti 1/2 )O 3 and related solid solutions exhibit an unusually negative thermal expansion with considerably enhanced tetragonality and Curie temperature. A zero thermal expansion is found over a wide temperature range of room temperature to 500 °C. Direct experimental evidence is given for the fact that the negative thermal expansion of PbTiO 3 -based solid solutions is strongly correlated with the temperature dependence of the ferroelectricity, which is a new negative thermal expansion mechanism.
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Chen et al. (2008) studied this question.
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