中文摘要：

采用Mn2.3Co3.7ZnxCuyO4（x=0、0.03、0.06;y=0、0.05、0.08、0.1、0.2）体系制备负温度系数热敏电阻（NTCR）,并通过EDS、SEM、FTIR研究了样品的微观结构和导电机理。结果表明,Mn-Co-O体系通过掺杂ZnO、CuO可以制备低阻高B型NTCR,当x=0.03,y=0.05可得到期望的电学参数。其中,Zn存在于四面体间隙,可以提升阻值B值;Cu同时存在于四面体间隙和八面体间隙,可以降阻值B值,部分CuO在晶界发生偏析。

英文摘要：

By adopting the ab-initio study of plane wave ultra-soft pseudo-potential technique based on the density function theory（DFT）,we presented geometric structure optimizations,as well as calculations of band distribution,density of states and absorption spectrum,on heavily N-doped rutile TiO2 supercell models as well as non-doped TiO2 ones.Calculation results show that,when the concentration of N equals x=0.0625,N 2p state and O 2p state hybrid couples together,causing valence band shifting up,minimum band gap narrowing,and absorption spectrum red shifting,which is consistent with similar effects in experiments on heavily N-doped TiO2.