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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