REVERSIBLE COLOR CHANGES AND STRUCTURAL IMPLICATIONS OF MICROWAVE MELTING ION-CONDUCTING GLASSES

摘要

Ionically conducting glasses in the AgI-Ag2(O)-B2O3-SiO2 system (e.g., 2AgI-Ag2O-2(0.95B(2)O(3) . 0.05SiO(2))) were prepared by melting in a domestic multi-mode microwave oven operating at 900 W and 2.45 GHz. Microwave heating resulted in rapid melting times (similar to 2.5 min), while homogeneity in the quenched glasses was equivalent to or better than glasses obtained by conventional melting at 730 degrees C. Microwave-melted glasses were reddish while the same composition melted in a conventional furnace was yellower. Remelting switched the yellower color to red upon microwave melting and the red color to yellower by furnace melting possibly due to the structural changes and/or differences in Ag+ mobility suggested by solid state NMR data. (C) 1997 Academic Press. [References: 15]