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- W1979668286 abstract "PbTiO3 phase stability and crystal growth were investigated under hydrothermal conditions near 500°C. Solubility of PtTiO3 was measured from 350 to 600°C; dependence on pressure and mineralizer was also determined. The PbO–TiO2–H2O phase diagram in 3.2 m KF shows a narrow region of PbO fraction 45.9–53.1% (Pb/Ti ratio 0.85–1.13) in which PbTiO3 is the only solid product as determined by powder X-ray diffraction. Regions on the PbO-rich side produce PbO plus PbTiO3, and regions on the TiO2-rich side yield PbTi3O7 plus PbTiO3. Solubility displays a positive temperature dependence with an estimated heat of solution ΔHsol=50 kJ/mol (12 kcal/mol). No appreciable solubility–pressure dependence is observed in the range of 10 000–30 000 psi (69–207 MPa). The solubility increases with KF concentration, then drops somewhat between 5.6 and 7.8 m KF. Decomposition of PbTiO3 occurs when KF molalities exceed 7.8 m. Hydrothermally grown crystals are yellow in color and are of rectangular prism habit. X-ray diffraction and EDS of grown crystals verify identity of the crystals to be PbTiO3. Crystal size increases dramatically between 485 and 600°C, with a significant decrease in optical crystal quality as the growth temperature increases." @default.
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- W1979668286 date "1999-02-01" @default.
- W1979668286 modified "2023-10-17" @default.
- W1979668286 title "Phase stability, solubility and hydrothermal crystal growth of PbTiO3" @default.
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- W1979668286 doi "https://doi.org/10.1016/s0022-0248(98)00914-2" @default.
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