Co-Mn-Ni-O<sub>2</sub>系材料阻温特性与频率的关系

Co-Mn-Ni-O₂系材料阻温特性与频率的关系

摘要: 通过XRD、SEM分析和变温、变频条件下的logρ-t测量,对Co-Mn-Ni-O₂系热敏材料的logρ-t特性与频率关系进行了研究。CoMn1.4Ni0.6O4尖晶石型氧化物热敏电阻材料的logρ-t特性在一定频率（0.1～1MHz）和温度范围（-70～100℃）,发生了由正温度系数（PTC）向负温度系数（NTC）的转变,且转变点的温度（-70～-10℃）和频率（0.1～1MHz）与材料电阻率相关。根据电导率σ和载流子浓度n、载流子迁移率μ之间的关系,对导电机理作了初步的解释。

Abstract: By XRD 、SEM analysis and logρ-t measurement at alter temperature and alter frequency,resistance temperature characteristics of Co-Mn-Ni-O₂ and frequency relationship were researched.In a range of frequencies（0.1～1MHz） and temperature（-70～100℃）,the change of resistance-temperature characteristics is observed for spinel CoMn_1.4Ni_0.6O₄ thermistor.The change of resistance-temperature characteristics is from PTC（positive temperature coefficient）to NTC（negative temperature coefficient）.The temperature（-70～-10℃） and frequency（0.1～1MHz）of transform point are related with material resistivity.On the basis of the relationship of conductance σ、concentration of carrier n and mobility of carries μ,this phenomenon is preliminary explained.