研究了Y2O3和ZnO共掺杂对BaTiO3陶瓷的微观结构和介电性能的影响. XRD分析表明, Y2O3和ZnO促使BaTiO3的晶体结构由四方相转变为赝立方相; 在此系统中Y2O3的固溶度低于1.5mol%, 而ZnO的固溶度约3.0mol%. SEM显示Y2O3比ZnO更能有效地改善微观结构, 其显著的晶粒抑制作用归因于分散于晶界的第二相Y2Ti2O7对晶粒生长的钉扎作用. 适量Y2O3和ZnO的协同作用有助于形成壳-芯结构, 并显著改善BaTiO3陶瓷的介电温度稳定性. 在BaTiO3-Y2O3-ZnO新体系中获得符合X7R的高性能抗还原介质.
The effect of Y2O3 and ZnO on the microstructure and dielectric properties of BaTiO3 materials was researched. XRD indicates the crystal structures of BaTiO3 transform from tetragonal to pseudocubic by Y2O3 and ZnO codoping. SEM shows Y2O3 behaves more effective grain-growth-inhibition than ZnO owing to the intergranular second-phase Y2Ti2O7. Sufficient Y2O3 and ZnO can help to form the core-shell structure and improve the dielectric-temperature characteristics markedly. The high performance nonreducible dielectrics satisfying X7R can be achieved in the BaTiO3-Y2O3-ZnO new system.
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