混合价钨氧化物的制备及其性质研究  

Preparation and Properties of Mixed Valence Tungsten Oxides

作　　者：吴介达[1] 刘金库[1] 祝胜祥[2] 黄忠良[1] 张涛[1] 许新华[1] 

机构地区：[1]同济大学化学系,上海200092 [2]同济大学物理系,上海200092

出　　处：《无机化学学报》2003年第6期613-616,共4页Chinese Journal of Inorganic Chemistry

基　　金：上海纳米科技发展与促进中心资助项目(No.0152nm041)。

摘　　要：synthesized with hydrazine oxalic acid and tungstic acid in different ratios and a series of tungsten oxides, O/W ratios from 2.90 to 2.30,were obtained by thermal decomposition from the precursors under nitrogen atmosphere at 640～760℃. This kind of tungsten oxides were found to belong to mixed valence compounds which have some special electrical properties. The experimental result indicated that the electrical conductivity of this tungsten oxide has a close relation with its O/W ratio and reach the maximum at WO2.50. Seclecting WO2.50 as an example, its conductivity was measured at different temperatures from -197 ℃to -2.5 ℃and it was found that the mixed valence tungsten oxide as conductor belongs to the class of metal ones. Owing to their relatively high electrical conductivity and stability in air, mixed valence tungsten oxide shows some potential use in polymer products as additives.Precursors were synthesized with hydrazine oxalic acid and tungstic acid in different ratios and a series of tungsten oxides, O/W ratios from 2.90 to 2.30, were obtained by thermal decomposition from the precursors under nitrogen atmosphere at 640 similar to 760degreesC. This kind of tungsten oxides were found to belong to mixed valence compounds which have some special electrical properties. The experimental result indicated that the electrical conductivity of this tungsten oxide has a close relation with its O/W ratio and reach the maximum at WO2.50. Selecting WO2.50 as an example, its conductivity was measured at different temperatures from -197degreesC to -2.5degreesC and it was found that the mixed valence tungsten oxide as conductor belongs to the class of metal ones. Owing to their relatively high electrical conductivity and stability in air, mixed valence tungsten oxide shows some potential use in polymer products as additives.

关 键 词：混合价化合物 钨氧化物 制备 密度 导电性 热稳定性 霍尔系数 导电材料 

分 类 号：TM241[一般工业技术—材料科学与工程] O614.613[电气工程—电工理论与新技术]