摘要
采用掺杂Y2O3、高能球磨和低温烧结技术,制备了电位梯度(Es)达1934~2197V/mm、非线性系数(a)为20.8~21.8、漏电流(IL)为0.59~1.04μA、密度(ID)为5.46~5.57g/cm^3的氧化锌压敏陶瓷。利用电子探针观察了压敏陶瓷的分布和形貌。X-射线衍射仪(XRD)证实了Y4样品(x(Y2O3)=0.1%)中Y2O3相的存在。随着Y2O3含量的增加,Es、α提高,IL、ρ和晶粒尺寸(D)降低;施主浓度(Nd)及界面态密度(Ns)降低,而势垒高度(φs)和势垒宽度(ω)增大。
Y2O3-doped ZnO-based varistor ceramics were prepared using high-energy ball milling (HEBM) technique under low-temperature sintering, with voltage-gradient (Es) of 1 934- 2 197 V/ram, non-linear coefficient (a) of 20.8-21.8, leakage current (IL) of 0.59-1.04 μA and density (p)of 5.46-5.57 g/cm^3. The distribution and morphology of varistor ceramics were observed by EPMA. XRD verified the existence of Y2O3 phase in sample Y4 (x(Y2O3)=0.10%). With increasing Y2O3 content, Es and a increased, IL, ρ and grain size (D) decreased; the donor concentration (Na) and density of interface states (Ns) decreased, whereas barrier height (φB) and barrier width (ω) increased.
出处
《压电与声光》
CSCD
北大核心
2007年第6期686-688,共3页
Piezoelectrics & Acoustooptics
关键词
压敏陶瓷
电性能
高能球磨
低温烧结
ZNO
Y2O3
varistor ceramics
electrical property
high-energy ball milling
low-temperature sintering
ZnO
Y2O3