| 介稳态氧化钨超微粉体的水热合成与光致变色性质研究 |
| Hydrothermal Synthesis and Photochromism Property of Superfine Powders of Metastable Tungsten Oxide |
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| 摘要: |
| 关键词: 氧化钨 焦绿石 钨青铜 水热合成 超微粒子 光致变色 |
| 基金项目: |
| Abstract: Under hydrothermal conditions, the superfine powders of cubic pyrochlore-type of tungsten oxide and hexagonal tungsten bronze were obtained by using Na2WO4·2H2O as the starting material. The products were characterized by XRD, TG, IR, UV and EPMA, respectively. The effects of the pH value, the acid concentration, reaction temperature and time on the structure and particle size of products were investigated in detail. The conditions for the preparation of superfine powders of tungsten oxide were optimized. The pH 2.5～4.5 of the reaction system led to the formation of a pyrochlore phase and pH 0.5～2.0 gave the hexagonal tungsten bronze structure. The photochromism property of the hexagonal tungsten bronze was studied. The results show that pyrochlore and bronze phases are decomposed at 300 ℃ and 450 ℃, respectively. With the increasing of temperature, the structure of the two oxides changes. The pyrochlore-type powder changes completely into triclinic Na2W4O13 around 500 ℃, while the bronze phase into a mixture of Na2W6O19 and triclinic WO3 at 550 ℃. The powder of the hexagonal tungsten bronze showed better photochromism property. |
| Keywords: tungsten oxide pyrochlore tungsten bronze hydrothermal synthesis superfine particle photochromism |
| 投稿时间：2004-07-26 修订日期：2004-10-01 |
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| 徐英明,霍丽华,赵辉,高山,赵经贵.介稳态氧化钨超微粉体的水热合成与光致变色性质研究[J].无机化学学报,2005,21(4):538-542. |
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