Pressure-induced change in the order of the phase transition in lead titanate: 
Structural aspects

Jabarov, S. G.; Kozlenko, D. P.; Kichanov, S. E.; Mamedov, A. I.; Mehdieva, R. Z.; Lukin, E. V.; Savenko, B. N.; Lathe, Christian

doi:10.3103/S1068375512010048

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Pressure-induced change in the order of the phase transition in lead titanate: Structural aspects

Authors

Jabarov, S. G.
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Kozlenko, D. P.
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Kichanov, S. E.
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Mamedov, A. I.
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Mehdieva, R. Z.
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Lukin, E. V.
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Savenko, B. N.
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Lathe, Christian
CGS Centre for Geological Storage, Geoengineering Centres, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

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.
https://doi.org/10.3103/S1068375512010048

https://gfzpublic.gfz-potsdam.de/pubman/item/item_244721

Abstract

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.