The order-disorder transition in gallium analogue of albite,NaGaSi3O8 |
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| Authors: | E. E. Senderov N. S. Vasiliev E. I. Yudin |
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| Affiliation: | 1. V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry of the USSR Academy of Sciences, Vorobyevskoye chaussee, 47-A, 117975, GSP-1, Moscow V-334, USSR
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| Abstract: | The order-disorder transformation in NaGaSi3O8 was studied at (P_{H_2 O} approx 100) bar using a hydrous sodium gallium silicate gel and synthetic Ga-albites of various degrees of order as initial materials. The structural state of the gallium albites was determined by the angle separation in X-ray powder patterns of 131 and 1 (bar 3) 1, and of (bar 2) 04 and 060 peaks. The direction of order-disorder transformations was found to change sharply at 938 (±3)°C. This indicates a first order phase transition in NaGaSi3O8 as in albite, of which it is the structural analogue. |
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