NTC热敏陶瓷用Mn_(0.43)Ni_(0.9)CuFe_(0.67)O_4的Pechini法合成及性能研究  

Synthesis and Characterization of Mn_(0.43)Ni_(0.9)CuFe_(0.67)O_4 NTC Materials by Pechini Method

作　　者：王绍刚[1] 常爱民[1] 张慧敏[1] 赵青[1] 

机构地区：[1]中国科学院新疆理化技术研究所

出　　处：《微纳电子技术》2007年第7期86-90,共5页Micronanoelectronic Technology

基　　金：新疆乌鲁木齐市科技局项目(G06211002)

摘　　要：采用Pechini法，成功制备了Mn0.43Ni0.9CuFe0.67O4纳米粉体。聚合前驱体在400-700℃下煅烧，采用热重-差热分析（TG-DTA）、红外光谱（IR）、X射线衍射（XRD）、粒度分布和扫描电镜（SEM）对产物进行了表征。煅烧后，在900-1200℃烧结，测试了烧结陶瓷的电学性能参数：电阻率ρ和材料常数B。结果表明，粉体的分解温度为300℃，由无定形相开始结晶；晶体结构不同于传统NTC材料的单一尖晶体结构，而是尖晶石相和单斜CuO相组成的固溶体；单斜CuO相对陶瓷的电学性能有较大影响。烧结性质表明，最佳烧结温度为1100℃，致密度为96%，2ρ5℃为600Ω.cm，材料常数B25℃/50℃为2000。Mn0.43Ni0.9CuFe0.67 04 nano-powders were synthesised by the Pechini method for the first time. A spinel-type phase＇ with a solid solution, was attained from calcining of the polymerized gel precursor at 400-700℃. The thermal evolution, surface morphology, and structural behavior were studied by TG-DTA, SEM, XRD and FT-IR. The electrical properties, the resistivity p and the materials constant B value, were also studied after sintering at 900-1200 ℃. It is found that the material decomposes upon heating above 300℃. The monoclinic structure of CuO is found to be coexistent with the spinel-type phase in both the calcined powders and the sintered ceramics. The electrical properties are deeply affected by the crystal phase of CuO. The ceramics sintered at 1100 ℃ shows the best electrical properties as well as the density, of which the relative densitv is about 96%. The p25℃ is about 600 Ω ·cm and B25℃ is about 2000.

关 键 词：热敏陶瓷 Mn0.43Ni0.9CuFe0.67O4 Pechini法 晶体结构 烧结性能 

分 类 号：TB383[一般工业技术—材料科学与工程]