Abstract
The crystal structure of AlPO 4 low cristobalite was refined at 25, 75, 125, 150, 175 and 200 °C from X-ray powder data with the Rietveld method confirming the orthorhombic symmetry C222 1 with very small deviation from tetragonal symmetry. Upon heating, the atoms are shifted by 0.022(3) A on the average towards their average positions in high temperature cristobalite. The volume gap at the displacive α-β transformation at 202 °C is slightly larger (4.6 %) than that of silica cristobalite (4.2 %). The high temperature modification was refined at 200 °C in space group F43 m using a split atom model for oxygen.
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