摘要
目的研制低电阻率高性能BaTiO3基PTCR陶瓷材料。方法采用“溶胶凝胶一步法”新技术和改进的烧结工艺。结果获得了室温电阻率ρ为6.76Ω·cm,电阻率突变ρmax/ρmin为105,温度系数α30为11.63,耐电压Vb为104.8V·mm-1,居里温度TC为100℃的PTCR陶瓷材料。结论液相添加剂ST掺杂中,各掺杂量的不同对PTCR陶瓷的电性能有不同程度影响。室温电阻率ρ随Si含量或Ti/Ba含量的增加呈U形变化;温度系数α30随Si含量增加单调递减,而随Ti/Ba含量的增加呈倒U形变化。
Aim To obtain BaTiO_3-based PTCR ceramics material with low resistivity and high performance.Methods Tow ways, one new technology via Sol-Gel in one step and the other via improved sintering process, were described.Results High performance ceramics with low room temperature resistivity ρ 6.76 Ω·cm, resistivity step ratio ρ_(max)/ρ_(min) as great as 10~5,temperature coefficient of resistivty α_(30) 11.63, breakdown voltage V_b as great as (104.8)V·mm^(-1) and Curie temperature T_C at 100℃ had been prepared.Conclusion The effect of various dopant concentrations on electrical properties of PTCR ceramics was investigated during the doping of liquid-phase additives ST. It was concluded that room temperature resistivity ρ went, initially, down and then rose up as the Si or Ti/Ba concentration was increased, while temperature coefficient of resistivty α_(30) always reducated with increasing Si concentration and rose up then went down with increasing Ti/Ba concentration.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第2期174-176,共3页
Journal of Northwest University（Natural Science Edition）
基金
陕西省教育厅专项科研基金资助项目(02JK05B)
西北大学科研基金资助课题(02NW13)
