材料物理与化学研究室知识库

采用电阻率为5 ·cm的p型单晶硅和n型单晶硅,通过高温扩散金属锰的方法,可得到两种类型的热敏材料。测试发现,选择适当的扩散温度和时间,这两种类型的热敏材料一致性都较好。对n型硅掺锰,得到的是小正温度系数热敏材料,其B值在620 K左右;对p型硅掺锰,得到的是负温度系数热敏材料,其B值在4 200 ~4300 K之间。

Two different thermo-sensitive materials are acquired by diffusing metal Mn into p-type Si monocrystal of 5Omega · cm and n-type Si monocrystal at high temperature. The measurment results indicate that their coherence is good when diffusing temperature and time is proper. Materials of low PTC can be obtained by diffusing Mn into n-type Si. Its B-value is about 620 K; and NTC materials can be acquired by doping Mn into p-type Si. Its B-value is 4 200～4300 K.