多种氧化物改性对BaTiO_3介电性能的影响  

The Effects of Modification by Various Oxides on Dielectric Properties of BaTiO_3

作　　者：李玲霞[1] 明翠[1] 孙晓东[1] 

机构地区：[1]天津大学,天津300072

出　　处：《稀有金属材料与工程》2006年第7期1092-1095,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助(50472064)

摘　　要：采用共沉淀BaTiO3为基,适量掺杂Nd2O3稀土氧化物及MgO与ZnO添加剂,获得具有X7R温度特性的低频高压MLC瓷料系统,BaTiO3基瓷的平均晶粒尺寸小于0.8μm,居里点弥散成为居里区。其介电性能为:介电系数ε≥3000;容量变化率ΔC/C≤±15%;介电损耗tgδ≤120×10-4;体积电阻率ρv≥1012?·cm;击穿场强Eb≥15kV/mm。Co-deposition BaTiO3 -based system was doped with Nd203, MgO and ZnO in this study. Through proper process and modification, the BaTiO3 MLC dielectrics with fine-grain of less than 0.8 μm were developed for low frequency and high voltage. Its curie point extended to be curie spectrum. The dielectric properties are as follows： the dielectric coefficient ε=3000 ±100, the capacity percentage △ C/C= ± 15% （from -55 ℃ to ＋ 125 ℃）, the dielectric loss tg δ≤120 × 10^-4, the resistivity ρv ≥10^12 Ω ·cm and the dielectric strength Eb ≥15 kV/mm.

关 键 词：稀土氧化物 BATIO3 低频高压 

分 类 号：O614.233[理学—无机化学]