Abstract
Barrerite, a zeolite with a stilbite-type framework, transforms on heating at 200–380° C and at 380–450° C into two new phases, called barrerite B and D respectively. After a few days barrerite B rehydrates to barrerite C. In the B and C heat-collapsed phases the aluminosilicate framework is interrupted by the statistical breaking of an oxygen bridge, giving rise to two partially occupied face-sharing tetrahedra. Near infrared (NIR) diffuse reflectance spectra show the absence of hydroxyls in natural barrerite and the presence of hydroxyls in its heat-collapsed phases. These results confirm the hypothesis that the fourth vertex of the tetrahedra generated from the breaking of the oxygen bridge is a hydroxyl. The presence of OH-bands in phase D suggests for this phase, as in the B and C phases, the presence of interrupted oxygen bridges.
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Alberti, A., Cariati, F., Erre, L. et al. Spectroscopic investigation on the presence of OH in natural barrerite and in its collapsed phases. Phys Chem Minerals 9, 189–191 (1983). https://doi.org/10.1007/BF00311953
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DOI: https://doi.org/10.1007/BF00311953