Co-Mn-Ni-O_2系材料阻温特性与频率的关系  

Relationship between Co-Mn-Ni-O_2 resistance temperature property and frequency

作　　者：康雪雅[1] 王天雕[1] Zhang D Button T W 

机构地区：[1]中国科学院新疆理化技术研究所,乌鲁木齐830011 [2]Functional Materials Group, IRC in Materials Processing, School of Engineering, University of Birminghan, B15 2TT, UK

出　　处：《功能材料与器件学报》2008年第3期561-565,共5页Journal of Functional Materials and Devices

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。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 CoMn1.4Ni0.6O4 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.

关 键 词：频率 热敏电阻 NTC PTC 

分 类 号：TB308[一般工业技术—材料科学与工程]