Application of synchrotron radiation to the study of high-pressure zeolite phases. Case of scolecite

Pressure-induced amorphization has already been observed in some framework silicates like quartz and feldspars. A similar crystal to highly disordered solid transition is reported in this study fora zeolite named scolecite, which is the calcium end-member of the natrolite group. Pressure-induced amorphization is demonstrated using in-situ X-ray diffraction and Raman spectroscopy. This transformation is preceded by polymorphic transitions and occurs below 10 GPa. The crystal-amorphous transition is irreversible and the pressure quenched samples exhibit Raman spectra which bear strong resemblance with alumino-silicate glasses obtained by quenching a liquid. In some cases however, decompression is accompanied by a rim recrystallisation of the sample. The role of shear stresses seems thus to be crucial during the decompression of the samples.

Published in:
Journal De Physique Iv, 6, 561-569
Presented at:
Colloquium on X-Rays and Matter - One Hundred Years Later (RX 95), STRASBOURG, FRANCE, Nov 06-09, 1995

 Record created 2011-09-29, last modified 2018-03-17

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