摘要
采用两步烧结法制备了Y3+掺杂的(以Y(NO3)3·6H2O形式加入)ZnO压敏陶瓷,通过XRD、SEM和EDX系统研究了Y3+掺杂量对ZnO压敏陶瓷微结构和电性能的影响。结果表明:随着Y3+掺杂量的增加,电位梯度VT和非线性系数α提高,晶粒尺寸减小,施主浓度Nd和晶界态密度Ns降低,势垒宽度ω增大。当掺杂的x[Y(NO3)3·6H2O]为1.2%、烧结温度为1100℃时,ZnO压敏陶瓷电性能最好,其VT为675V/mm,α为63.9,漏电流IL为2.40μA。
Y（NO3）3 · 6H2O-doped ZnO varistor ceramics were prepared by two-step sintering method. The effects of Y（NO3）3 · 6H2O-doped amount on the microstructure and electric properties of ZnO varistor ceramics were systematically studied by XRD, SEM and EDX. The results show that with increasing Y（NO3）3 · 6H2O-doped amount, voltage gradient（VT） and nonlinear coefficient （α） increase, grain size decreases, the donor number density （Nd） and density of grain boundary states （Ns） decrease, whereas barrier width（ω） increases. When x[Y（NO3）3 ·6H2O] and sintering temperature are 1.2% and 1 100 ℃, respectively, obtained ZnO varistor ceramics have best electric properties： voltage gradient of 675 V/mm, nonlinear coefficient of 63.9, and leakage current of 2.40 μA.
出处
《电子元件与材料》
CAS
CSCD
北大核心
2009年第12期52-55,共4页
Electronic Components And Materials
基金
上海市科委技术创新人才团队建设专项资助项目(No.06DZ05902)
上海市教育委员会重点学科建设资助项目(No.J50102)
上海市科委学科带头人计划资助项目(No.07XD14014)
关键词
ZNO压敏陶瓷
两步烧结
稀土硝酸盐
微结构
电性能
ZnO varistor ceramic
two-step sintering
rare earth nitrate
microstructure
electrical properties
