中文摘要：

以Mn3O4和Co3O4为原料,ZnO和CuO为掺杂剂,采用固相反应法制备了Mn2.3Co3.7-x-yZnxCuyO（4x=0,0.03和0.06;y=0,0.05,0.08,0.10和0.20）单层片式NTC热敏电阻材料。研究了该材料的微观结构和电性能。结果表明：通过掺杂ZnO和CuO,可以制备低阻高B型Mn-Co-O系NTC热敏电阻材料。随着ZnO掺杂量的增加,其电阻率先减小后增大,B25/50值一直增大;而随着CuO掺杂量的增加,电阻率和B25/50值都迅速减小,同时部分Cu2O在晶界发生偏析。当x=0.03,y=0.05时,该材料具有较好的NTC特性：其ρ25为719.34Ω·cm,B25/50值为3954.9K。

英文摘要：

Using Mn3O4 and Co3O4 as the starting materials,ZnO and CuO as the dopants,Mn2.3Co3.7-x-yZnxCuyO（4x= 0,0.03 and 0.06;y=0,0.05,0.08,0.10 and 0.20）NTC （negative temperature coefficient） thermistors were prepared by the solid-state reaction method.The microstructure and electric properties of the thermistors were studied.The results show that Mn-Co-O type NTC thermistor with low resistivity and high B25/50 value can be obtained by doping ZnO and CuO.As the ZnO doping amount increases,the resistivity decreases first and then increases,while the B25/50 value increases constantly;The resistivity and B25/50 value decrease rapidly with the increase of CuO doping amount,and the segregation of Cu2O occurs at the grain boundary.The Mn-Co-O type NTC thermistor doped with ZnO and CuO shows a good NTC behavior when x=0.03 and y=0.05,and its ρ25 and B25/50 value are 719.34 ？·cm and 3 954.9 K,respectively.