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Single-crystal in situ high-P X-ray diffraction was performed at P = 0.0001, 3.2, 4.4, 6.2, and 7.4 GPa on synthetic Ca 0.2 Sr 0.8 Al 2 Si 2 O 8  feldspar (An 20 SrF 80 ). Data collections confirmed the displacive first-order triclinic I1̅-monoclinic I2/c phase transition at P ~4.3 GPa found in a previous high-P investigation and defined the first-order monoclinic-monoclinic transformation at P ~7.3 GPa as an I2/c-P2 1 /c symmetry change. The structural modifications induced by the increase of pressure inside the stability fields of I1̅ and I2/c configurations as well as the structural behavior of the two phase transitions were detailed. The I1̅-I2/c transition is similar to the displacive ferroelastic I1̅-I2/c phase transition observed for the same composition with increasing temperature and is related to the increase of the M-site coordination number, with the consequent regularization of Ca/Sr polyhedra and framework. Variations of the T-O-T bond angles are observed, whereas the O-T-O angles do not change significantly.

The high-pressure structural configurations of Ca 0.2 Sr 0.8 Al 2 Si 2 O 8 feldspar: The I1̅-I2/c and I2/c-P2 1 /c phase transitions