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The mineral bicchulite, |Ca 8 (OH) 8 |[Al 8 Si 4 O 24 ]- SOD , has the sodalite-(SOD-)type structure. At elevated temperatures it decomposes into gehlenite, Ca 2 Al 2 SiO 7  (melilite-type structure), and water (vapour). We report on the thermal expansion of two bicchulite-type compounds, the mineral bicchulite up to  T  = 740 K and |Ca 6 Eu 2 (OH) 8 |[Al 10 Si 2 O 24 ]- SOD  up to  T  = 1025 K. The expansion mechanism is described.  In  situ  X-ray powder diffraction experiments were performed to evaluate the thermal decomposition of |Ca 6 Eu 2 (OH) 8 |[Al 10 Si 2 O 24 ]- SOD  into 4 (Ca 1.5 Eu 0.5 ) T  1 [ T  2  2 O 7 ] and 4 H 2 O, with  T  i  = Al or Si in a ratio of 5 : 1. A structural mechanism for the transformation from the sodalite to the melilite topology is proposed, based on geometrical considerations.

zeitschrift für kristallographie - crystalline materials

The transformation mechanism of the sodalite- to the melilite-topology: Thermal expansion and decomposition of bicchulite-type to melilite-type compounds