摘要
采用传统陶瓷方法制作了Mg1+xAl0.8Cr0.6Fe0.6Lay(x=–0.10,–0.05,0,0.05,0.10,0.15,0.20;y=0,0.05)系高温NTC陶瓷材料,借用XRD、SEM和电性能测试等手段,研究了MgO含量及La2O3掺杂对陶瓷材料相结构和电学性能的影响规律。结果表明:适当增加MgO的含量可以有效提高陶瓷材料的常温电阻率和B值(材料常数),La2O3掺杂可改善高温NTC陶瓷材料B值的稳定性。当x=0.15,y=0.05时,在1 873 K烧结可获得ρ25=7.55×1010.cm,B=8 795 K的高温NTC陶瓷材料。
Mg1＋xAl0.8Cr0.6Fe0.6Lay（x=-0.10,-0.05,0,0.05,0.10,0.15,0.20;y=0,0.05） series NTC thermistors were prepared by using the conventional ceramic technique. The effects of MgO content and La2O3-doping on the phase structure and electric properties of the samples were studied using XRD, SEM and electric property measurements. The results show that increasing the content of MgO can effectively improve the resistivity and B value （material constant）; La203-doping can improve the stability of B value for ceramic samples. The obtained samples with x = 0.15, y=0.05 sintered at 1 873 K show optimal electric properties with P25 of p25=7.55×10^10Ω·cm and B value of 8 795 K.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2013年第3期46-49,共4页
Electronic Components And Materials
关键词
NTC
高温热敏电阻
改性
La2O3掺杂
MGO含量
常温电阻率
B值
晶界占有率
negative temperature coefficient
high temperature thermistor
modification
La2O3-doping
MgO content
room temperature resistivity
B value
boundary share
