蒸汽掺杂-一种新的钛酸钡基PTCR陶瓷的掺杂方法

晶界铲应是陶瓷材料所固的的特性，利用某些氧化物在高温下具有较高的蒸汽压，在烧成过程对陶瓷材料进行掺杂改性，可以有效地控制晶界行为，改善材料性能，钛酸钡基半导体陶瓷中存在的ＰＴＣＲ效应，是一种典型的晶界效应。

Vapor Doping Method, a New Effective Method Used in BaTiO3 Based PTCR Ceramics

Grain boundary effect is one of the characteristics of ceramic materials. Some oxides have high vaporization pressure. Using vapor as doping resource during sintering, the grain boundary behavior can be effectively controlled and the material properties can be improved. The PTCR effect that existed in semiconducting barium titanate based ceramics is a typical grain boundary effect. The experimental results show that materials doped with Sb₂O₃ or Bi₂O₃ vapor have high density and homogeneous microstructure with small grain size. The sample with over 8 orders of magnitude degree of resistivity jumping can be obtained. Thus vapor doping method is a new and effective method.