摘要
用热液法制备了ＮａｘＷＯ３，ｘ为０００１８～００３８０，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≥１６０×１０－６时（质量分数），得到斜方晶ＷＯ３·１３Ｈ２Ｏ单相，当钠含量≤４０×１０－６时，得到ＷＯ３·Ｈ２Ｏ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ＷＯ３·１３Ｈ２Ｏ在２９０～４２０℃脱水得到六方晶ｈＮａｘＷＯ３；继续升高温度在４２０～４５０℃恒温处理，则得到单斜晶ｍＮａｘＷＯ３．
New hexagonal tungsten oxide (h Na x WO 3) 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 x WO 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 Na x WO 3 was treated at the temperature of 450 ℃.
出处
《中南工业大学学报》
CSCD
北大核心
1999年第2期148-152,共5页
Journal of Central South University of Technology(Natural Science)
关键词
钨酸胶体
斜方晶
钨氧水合物
钨氧化合物
六方晶
tungstic acid gel
orthorhombic tungsten oxide hydrate
hexag onal tungsten oxide
monoclinic tungsten oxide
