The crystal structure of lead titanate PbTiO3 have been studied by energy-dispersive X-ray diffraction under pressures of 0–4 GPa in the temperature range of 300–950 K. At a temperature of T = 747 K, a structural phase transition from a ferroelectric tetragonal phase to a paraelectric cubic phase is observed. The application of pressure leads to a significant decrease in the phase transition temperature; under pressures of P ~ 2 GPa, the type of the phase transition changes from the first to second order. In the low pressure range, the baric coefficient value is dTc/dP = –20(3) K/GPa; under pressures above 2 GPa, it increases up to –113(5) K/GPa.

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Jabarov, S. G.; Kozlenko, D. P.; Kichanov, S. E.; Mamedov, A. I.; Mehdieva, R. Z.; Lukin, E. V.; Savenko, B. N.; Lathe, C. (2012): Pressure-induced change in the order of the phase transition in lead titanate: Structural aspects. Surface Engineering and Applied Electrochemistry, 48, 1, 69-73.