【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。更多还原

【Abstract】 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 64m~2/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.更多还原