摘要
利用传统的电子陶瓷工艺制备Li2CO3和Na2CO3混合掺杂的WO3陶瓷样品。Li2CO3的摩尔分数从2%到0,Na2CO3的摩尔分数从0到2%。测量样品的电流-电压关系,一些I-V曲线显示出明显的复阻特性,发现复阻现象和样品电学经历存在直接联系。XRD显示样品中的WO3为两相共存。SEM显示不同样品中的晶粒的形状和尺寸有很大不同。实验结果表明,Na+对Li+的影响表现为抑制效应,同时观察到明显的混合碱效应。
Ceramics samples of tungsten trioxide doped with lithium carbonate and sodium carbonate are prepared by conventional ceramic technique. The molar proportion of lithium carbonate varies from 2 % to 0 with sodium carbonate from 0 to 2%. The current voltage characteristics of these ceramics are also measured. Some of the I-V curves show obvious negative resistance characteristics. It is found that there exists a direct correlation between the negative resistance phenomenon in the I - V curves and the electrical history of these samples. X-ray diffraction （XRD） reveals coexistence of two phases of tungsten trioxide. Scanning electron microscope （SEM） shows great differences for both grain shape and size among the different ceramics. All of these indicate that Na^＋ doped into tungsten trioxide inhibits the effect of Li^＋.And obvious mixed alkali effect is also observed.
出处
《中国钨业》
CAS
北大核心
2007年第2期37-41,共5页
China Tungsten Industry
关键词
三氧化钨
混合碱掺杂
负阻效应
tungsten trioxide
mixed alkali
negative resistance
