The effect of annealing on the photoluminescence of layered perovskite H_1.77[Sr_0.8Bi_0.21Ta₂O₇] powders

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• 作者：Zi Chen ; Wen Dong ; Fengang Zheng ; Liang Fang ; Mingrong Shen
• 关键词：A. Layered compounds ; D. Luminescence ; D. Microstructure
• 刊名：Materials Research Bulletin
• 出版年：2011
• 出版时间：January 2011
• 年：2011
• 卷：46
• 期：1
• 页码：52-56
• 全文大小：597 K

文摘

The microstructural and luminescent properties of H_1.77[Sr_0.8Bi_0.21Ta₂O₇] powders under different dehydrating conditions were investigated. The powders were obtained by protonating Bi₂SrTa₂O₉ powders in 3 M aqueous HCl solution, and were dehydrated by a post-annealing in air from 250 to 700 °C. The photoluminescence was enhanced for all dehydrated powders, especially for the sample annealed at 400 °C. The thermogravimetric analysis showed that there is an obvious dehydration temperature range from 200 to 400 °C, which was corresponding to the changing of the microstructure and photoluminescence in the same temperature range. The mechanism behind the experimental results was discussed.