摘要
研究了Ｓｒ－Ｖ－Ｏ系统内低价钒氧化物存在时的相关系．用Ｘ光衍射分析鉴定了相组成，并用标准直流四探针法测定了１００～１０００Ｋ温度范围内的组成相的电阻率．结果表明在该系统内，在还原气氛下形成的低价钒化合物有六方的Ｓｒ８Ｖ８Ｏ（２５），立方的Ｓｒ２Ｖ２Ｏ５和Ｖ２Ｏ３，三者在１５０Ｋ以上均具有１０ｏ～１０１Ω·ｃｍ的电阻率．Ｖ２Ｏ３相在低于１５０Ｋ附近电阻率有一个约１０４数量级的跃升，显示了在降温时由导电性向绝缘性的突变．
The phase relationship of Sr-V-O system in echtance of low valent vanadium chide has been investigated. The phase identification was performed by X-ray diffeactometry. The resistivities of constituent phases were measured by standard four prode technique in temperature range of 100-1000K. The results indicate that low valent vanadium compounds in the system exist as hexagonal Sr8V8O(25) and cubic Sr2V2O5 as well as V2O3, which show an electrical resistivity of 100 ￣ 101Ω·cm above 150K. V2O3 phase exhibits a steep enhancement in resistivity with a magnitude of order of 105Ω·cm at temperature lower than 150K, showing a transition from eleCtrical conductor to insulator.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第4期493-496,共4页
Journal of Inorganic Materials
关键词
钒锶氧化合物
相关系
电导率
vanadium-strontium chide, phase relationship, electrical conductiyity
