Thermal dehydration of stilbite was investigated by thermogravimetry and in situ X-ray powder diffraction. Sample mass changes continuously over the whole temperature range, with anomaly near 175 °C described in terms of the second-order phase transition with changes in symmetry from F-centered unit cell to A-centered one. This contradicts to the step-wise change in sample mass and the first-order phase transition with symmetry changing from F2/m to Amma reported in literature. The change in the order of the phase transition by means of the changes in experimental techniques is discussed.
1. Breck, DW. Zeolites molecular sieves, structure, chemistry and use. New York: Wiley; 1974.
Breck, DW. Zeolites molecular sieves, structure, chemistry and use. New York: Wiley; 1974.)| false