摘要
本文采用还原气氛制备导电性能优良的多晶多相陶瓷材料Li_2Mo_(2-x)W_xO_6(x=0,0.1,0.3),采用粉末X射线衍射分析、特征X射线能谱分析、红外光谱分析和电子自旋共振波谱分析等现代测试手段,得到样品的物相结构为Li_2Mo_(1-x)W_xO_4和MoO_2两相组成。W的掺入主要取代Mo进入Li_2Mo_O_4晶格中,通过导纳电桥法和交流阻抗谱测定方法研究样品材料的导电性能。室温下,x=3的样品其电导率为1.42×10~2(Ωcm)^(-1),300℃时其电导率为2.86×10~2(Ωcm)^(-1),研究表明:W的掺入提高样品的电导率,降低离子导电激活能。文中还提出样品材料的显微结构模型和离子导电机理。
The poly crystal multiphase creamics material Li2Mo2-xW_xO5 with high conductivity is prepared in reducing atomsphere. By X-ray diffraction, EDX graph, 1R and ESR spectra, it is determined that the sample material is composed of two phases, i.e., Li2Mo1-xW_xO4
and MoO2. The addition of tungsten mainly replaces molybdenum in the Li2MoO4 lattice. The electrical properties are studied by a.c. admi tance bridge method and a.c. complex impedance spectroscopy. The conductivity of the sample (x = 0.3) is σ27℃ =1.42×10^(-2)(Ωcm), σ300℃=2.86×10^(-2)(Ωcm)-1. The conductivity increases and the ionic conduction activation energy decreases with increasing tungsten content. The microstructure model and the ionic conduction mechanism are given in this paper.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1991年第7期1101-1109,共9页
Acta Physica Sinica
