Thermal conversion of the hydrous aluminosilicate LiAlSiO3(OH)2 into γ-eucryptite
Author:
Gordeeva Alisa1, Jenei Istvan Z.1, Spektor Kristina2, Vekilova Olga Yu.1, Häussermann Ulrich1
Affiliation:
1. Department of Materials and Environmental Chemistry , Stockholm University , SE-10691 Stockholm , Sweden 2. ESRF, The European Synchrotron Radiation Facility , 38000 Grenoble , France
Abstract
Abstract
LiAlSiO3(OH)2 is a dense hydrous aluminosilicate which is formed from LiAlSiO4 glass in hydrothermal environments at pressures around 5 GPa. The OH groups are part of the octahedral Al and Li coordination. We studied the dehydration behavior of LiAlSiO3(OH)2 by a combination of TEM and multi-temperature PXRD experiments. Dehydration takes place in the temperature interval 350–400 °C. Above 700 °C LiAlSiO3(OH)2 is converted via a transient and possibly still slightly hydrous phase into γ-eucryptite which is a metastable and rarely observed polymorph of LiAlSiO4. Its monoclinic structure is built from corner-sharing LiO4, AlO4 and SiO4 tetrahedra. The ordered framework of AlO4 and SiO4 tetrahedra is topologically equivalent to that of cristobalite.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
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