水热法制备Co-Mn-Ni-Mg-Fe-O系NTC热敏电阻材料  

Hydrothermal synthesis of Co-Mn-Ni-Mg-Fe-O nano-spinel NTC thermistor material

作　　者：孙俊菊[1] 妥万禄[1] 常爱民[1] 赵青[1] 兰玉歧[1] 

机构地区：[1]中国科学院新疆理化技术研究所

出　　处：《功能材料与器件学报》2006年第5期361-365,共5页Journal of Functional Materials and Devices

摘　　要：分别用共沉淀法和水热法合成了Co-Mn-N i-Mg-Fe-O系NTC热敏电阻材料,对两种方法的合成进行了比较,确定用水热法制备NTC热敏电阻材料,可以直接合成尖晶石相纳米粉体材料。实验发现以NaOH为沉淀剂,在250℃的水热合成温度下恒温10h制备的纳米粉体材料效果最佳。测试表明其晶体结构完整,颗粒呈球形,平均粒径为75nm,比表面积为64m2/g,粒度均匀,分散性好。研究还发现,水热反应时间的延长有利于晶体结构的形成,而粒度变化不大。Co- precipitation and hydrothermal synthesis method were used respectively to prepare Co- Mn - Ni - Mg - Fe - O compound NTC （ negative temperature coefficient） thermistor material. The samples were tested by using XRD, SEM technology. The results show that hydrothermal synthesis is suitable for synthesizing Co- Mn -Ni- Mg- Fe- O material. It is shown by the experiment that NaOH solution is the most suitable precipitator, and the most suitable temperature is 250℃ for 10h. The nanocrystalline powder with a spinel structure is spherical and the average diameter is 75nm, the special surface area is 64m2/g. The as - prepared powder is uniform in size and it＇s well dispersed. In addition, the increase of reaction time improves the crystallinity of the material, but is doesn＇t change the particle size.

关 键 词：NTC 水热 尖晶石相 热敏电阻 

分 类 号：O611.4[理学—无机化学] TB381[理学—化学]