Evolution in Structural and Optical Properties of Stannic Oxide Xerogel upon Heat Treatment
- 1 January 1999
- journal article
- Published by Wiley in Journal of the American Ceramic Society
- Vol. 82 (1) , 67-73
- https://doi.org/10.1111/j.1151-2916.1999.tb01724.x
Abstract
Upon consecutive heat treatments at increasing temperatures, the microstructure of solution–sol–gel‐derived stannic oxide (SnO2) xerogel evolves in three stages: (I) below 300°C, characterized by extensive dehydroxylation and gel shrinkage with little grain growth and surface loss; (II) between 300° and 500°C, by extensive crystallization, leading to dramatic surface loss (by 70%); and (III) above 500°C, by grain growth. Concurrently, the UV‐absorption edge shows red shifts during stages I and II and blue shifts during stage III, resulting in distinct color variations. The edge displacement bears a close correlation with a Raman “defect band” at ∼305–328 cm−1.Keywords
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