Abstract
Neutron and X-ray high-pressure powder-diffraction experiments on silica sodalite with 1,3-dioxolane as a template molecule, (C 3H 6O 2) 2[Si 12O 24], were performed up to a maximum pressure of 2.7 GPa. A phase transition from the fully expanded structure at ambient pressure, space group Im 3 ̄ m, to the acentric space group I 4 ̄ 3m was derived from the observed compression behaviour. A ferro-elastic phase transition appears at about 1.2 GPa to the rhombohedral crystal system. From symmetry analysis and the observed transition behaviour the space groups R3 or R3 m are proposed for p>1.2 GPa.
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