(Color online) Representative synchrotron XRD patterns of tetragonal and cubic PbTiO3.
(Color online) Pressure-temperature phase diagram of PbTiO3. Empty circle – cubic phase; empty square – tetragonal phase prior to heating; solid square – tetragonal phase upon heating; solid diamond – tetragonal to cubic phase transition in Ref. 27 11.2 GPa; solid cross – tetragonal to cubic phase transition in Ref. 26 13 GPa. The dashed line represents a boundary between the cubic and tetragonal phases.
(Color online) Variation of lattice parameters of tetragonal PbTiO3 as a function of pressure at different temperatures.
(Color online) P-V-T data measured for cubic PbTiO3. The curves represent results of the least-squares fitting using Eq. (1).
(Color online) P-V-T data measured for tetragonal PbTiO3. The curves represent results of the least-squares fitting using Eq. (1).
(Color online) Thermal pressures (P th) of the cubic (empty circles) and tetragonal (solid circles) PbTiO3 phases as a function of temperature. The spread of the data points at any given temperature corresponds to thermal pressures at different volumes, which are plotted in detail in the inset. The lines in the inset show approximate constant values of thermal pressure at a given temperature.
Summary of thermoelastic parameters for cubic and tetragonal PbTiO3. Except for , the numbers in parentheses are standard deviations from the least-squares fit and refer to the last digit(s) of the parameter values. For , the uncertainties are estimated from the error propagation of K 0 and .
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