New High‐Pressure Forms of Al2SiO5.

Abstract: Phase relations of Al₂SiO₅ have been studied by multianvil experiments at pressures of 13–23 GPa and temperatures of 2000–2900 K. Al₂SiO₅ kyanite was found to transform into two new high‐pressure forms of Al₂SiO₅ (kyanite II and III) at temperatures exceeding 2300–2500 K and pressures of 14–23 GPa: The first phase transition occurs near 14 GPa, and the second occurs near 17 GPa. The new Al₂SiO₅ phases have triclinic and monoclinic crystal symmetries with zero‐pressure densities of 3.876(2) and 3.982(1) g/cm³, respectively, which are significantly denser than kyanite (ρ₀ = 3.666 g/cm³) but less dense than the isochemical mixture of Al₂O₃ corundum and SiO₂ stishovite (ρ₀ = 4.036 g/cm³). The exceptionally high stability temperatures of the new Al₂SiO₅ phases suggest that they are unlikely to form in the present mantle but may be found in some impact craters and shocked meteorites and act as important indicators of pressure and temperature for the shock events. [ABSTRACT FROM AUTHOR]