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- W1988713964 abstract "Structure models of MgGeO 3 post-perovskite ( Cmcm ) are presented, along with a structure survey, demonstrating that all perovskite, post-perovskite and CaIrO 3 -type structures ( ABX 3 ) have specific ranges of the volume ratio between cation-centered polyhedra ( V A : V B ). The quality of the reported diffraction data and MgGeO 3 structure models is enhanced via implementation of a new graphite gasket for the diamond anvil cell, which stabilizes a larger sample volume, improving powder statistics during X-ray diffraction, and via the thermal insulation required to achieve ultra-high temperatures while laser-heating samples at pressures near 100 GPa. The structure survey supports the theory that the pressure–temperature conditions under which the perovskite/post-perovskite phase transition occurs can be estimated by extrapolating the change in V A : V B to a value of 4, which corresponds to a maximum tilt of BX 6 octahedra in the perovskite structure ( Pbnm ) where inter-octahedral anion–anion distances match the average intra-octahedral anion–anion distance. Once these short inter-octahedral distances between anions are reached in the perovskite structure, further tilting of octahedra and decrease of the V A : V B ratio does not occur, driving the transition to post-perovskite structure as pressure is increased." @default.
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- W1988713964 date "2008-01-16" @default.
- W1988713964 modified "2023-10-18" @default.
- W1988713964 title "Gasketing optimized for large sample volume in the diamond anvil cell: first application to MgGeO3and implications for structural systematics of the perovskite to post-perovskite transition" @default.
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- W1988713964 doi "https://doi.org/10.1107/s0021889807050029" @default.
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