Co-Mn-Ni-O_2系材料阻温特性与频率关系的研究  

Research on relationship of resistance temperature characteristic and frequency for Co-Mn-Ni-O_2 system materials

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

机构地区：[1]中国科学院新疆理化技术研究所,新疆乌鲁木齐830011 [2]Functional Materials Group, IRC in Materials Processing, School of Engineering ,University of Birminghan, B 15 2TT, UK

出　　处：《电子元件与材料》2007年第7期53-56,共4页Electronic Components And Materials

摘　　要：通过XRD、SEM分析和变温、变频条件下的lgρ-t测量,对Co-Mn-Ni-O2系热敏材料的lgρ-t特性与频率f的关系进行了研究。结果表明:CoMn1.4Ni0.6O4尖晶石型氧化物热敏电阻材料的阻温特性在0.1~1MHz和–70^+100℃,发生了PTC向NTC的转变,且转变点的温度(–70~–10℃)和f(0.1~1MHz)与材料电阻率ρ有关。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,用小极子跳跃导电理论对上述现象作了解释。By XRD, SEM analysis and lg ρ-t measurement at altered temperature and altered frequency, resistance temperature characteristics of Co-Mn-Ni-O2 and frequency relationship were researched. In a range of frequencies （0.1- 1 MHz） and temperature （-70 - ＋100 ℃）, the changes of resistance-temperature characteristics were 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 （0.1-1 MHz）of transform point are related with material resistivity. On the basis of the relationships of conductance σ, concentration of carder n and mobility of cartier μ, this phenomenon is explained by the small polarons conduct theory.

关 键 词：电子技术 频率 热敏电阻 NTC PTC 小板子 

分 类 号：TN37[电子电信—物理电子学]