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Reversed brackets for the P1̅= I1̅ transition in anorthite at high pressures and temperatures

The pT to IT phase transition in end-member anorthite, CaA12Si20g, has been reversed in-situ at high pressures and temperatures in an internally heated diamond-anvil pressure cell using single-crystal X-ray diffraction. The unit-cell parameters of anorthite were determined at 48 temperature-pressure points up to 255 OCand 2.6 GPa. At high pressures and temperatures, from room temperature up to -225°C, the transition is marked by a first-order step in the unit-cell volume and the complete disappearance of c and d reflections from the diffraction pattern. From room temperature to -195 °C and 2.1 GPa, the transition boundary is linear and nearly isobaric, with a slope, dP/ dT, of -0.003 GPa/°C. From 195 to 240°C and 1.5 GPa the boundary is curved, with increasingly negative dP/dT, and the magnitudes of 11V and the scalar strain associated with the transition decrease to about 75% of their high-pressure values of -0.2 and -0.011 %. From 1.5 GPa to room pressure, the boundary is isothermal at 240°C and is marked by the disappearance of the c and d reflections, although there are no detectable discontinuities in the unit-cell parameters. The phase transition remains unquenchable over the entire boundary. The distinct changes in character of the phase transition and the trajectory of the equilibrium boundary in P-T space are associated with a crossover in the IT phase field that is marked by a sudden change in cell parameters of this phase over the pressure interval of -1.5-2.0 GPa.