Abstract
The authors report the effects of heat treatment on the morphological and the crystallization behaviors of a photoresponsive 65CdO-17.5B2O3-17.5SiO2 (mol%) bulk glass and its film. The bulk glass exhibited a clear phase-separation morphology when heat treated at 575 °C for 1 h, and started to crystallize preferentially into phases with high CdO contents after heat treatment at 595 °C. Heat treatment of the films at 575 °C for 2 h resulted in simultaneous phase separation and crystallization. The morphology of the film heat treated at 575 °C was found to comprise discontinuous CdO-poor phases formed in the matrix of a CdO-rich phase; however, these discontinuous phases became interconnected upon subsequent heat treatment at temperatures over 575 °C. Various phases were formed concurrently by crystallization, with relatively large crystals of high CdO content preferentially formed in the CdO-rich phase whereas small crystals of low CdO content formed in the CdO-poor phase. The main crystals of the heat-treated films were found to be transformed into crystal phases with higher CdO contents with increasing heat-treatment temperature, and this is likely caused by a change in the composition related to phase separation.
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