新的六方晶钨氧化合物NaxWO3的制备
来源期刊：中南大学学报(自然科学版)1999年第2期
论文作者：赵秦生 曹桂芳 余尚慈
文章页码：38 - 42
关键词：钨酸胶体;斜方晶钨氧水合物;六方晶钨氧化合物;单斜晶钨氧化合物
Key words：tungstic acid gel; orthorhombic tungsten oxide hydrate; hexag onal tungsten oxide; monoclinic tungsten oxide
摘 要：用热液法制备了NaxWO3，ｘ为 0.0018～0.0380，这是一类新的六方晶钨氧化合物．斜方晶钨酸钠酸化水洗，再进行热液脱水；当钠含量≥10-6×10－６时（质量分数），得到斜方晶WO3·1/3H2O单相，当钠含量≤40×10－６时，得到WO3·1/3H2O单相，当钠含量在40×10－６～160×10－６之间则为两相混合物．斜方晶WO3·1/3H2O在290～420℃脱水得到六方晶h-NaxWO3；继续升高温度在420～450℃恒温处理，则得到单斜晶m-NaxWO3．
Abstract: New hexagonal tungsten oxide (h-NaxWO3) has been prepared by hydrotherm al method with values of x from0 0018 to 0 0380.Orthorhombic Na 2WO 3·2H 2O was acidified and washed,then dehydrated with hydrothermal m ethod;WO 3·13H 2O orthorhombic crystals were formed when so dium concentration ≥160×10 -6 ;WO 3·H 2O phase was crystallized when so dium content ≤40×10 -6 ;an intermediate range of sodium amount,with mixed growth of WO 3·13H 2O and WO 3·H 2O phases was obtained .h-Na xWO 3 hexagonal crystallite was prepared from WO 3·13 H 2O by dehydration with temperature ranging from 290 to 420 ℃. Monocli nic crystalline was formed when h-NaxWO3 was treated at the temperature of 450 ℃.
