Effects of CaZrO3 on X8R Nonreducible BaTiO3‐BasedDielectric Ceramics
Effects of CaZrO3 on X8R Nonreducible BaTiO3‐BasedDielectric Ceramics
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DOI：
10.1111/j.1551-2916.2011.04563.x
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发表时间：
2011-11
影响因子：
3.9
通讯作者：
Guofeng Yao;Xiao-hui Wang;Tieyu Sun;Long-tu Li
中科院分区：
文献类型：
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作者：
Guofeng Yao;Xiao-hui Wang;Tieyu Sun;Long-tu Li
研究了CaZrO3对BaTiO3-MgO-MnO2-Y2O3不可还原陶瓷的影响。采用常规混合法制备了0 ~ 2 mol%的CaZrO3改性试样。透射电镜分析表明，掺杂元素在晶界富集，形成“核-壳”结构。CaZrO3的加入可以降低烧结温度。居里温度随着CaZrO3的增加而升高，这是由于晶粒芯壳之间存在晶格失配所产生的内应力。介电常数和电容变化的温度依赖性也与CaZrO3含量有关。随着CaZrO3含量的增加，绝缘电阻率提高，但在直流电场作用下电阻率下降明显。因此，适当的CaZrO3含量对于获得高性能的X8R不可还原性batio3基介电材料至关重要。
Effects of CaZrO3 on BaTiO3–MgO–MnO2–Y2O3 nonreducible ceramics were investigated. The specimens modified by CaZrO3 in the range from 0 to2 mol% were prepared via conventional mixing method. Transmission electron microscopic analysis revealed that doping elements were enriched at grain boundaries and “core–shell” structures were formed. The addition of CaZrO3 could lower the sintering temperature. The Curie temperature was shifted to a higher point with increasing CaZrO3, attributed to the existence of an internal stress produced by lattice mismatch between grain cores and shells. Temperature dependence of dielectric constant and capacitance change were also dependent on CaZrO3 content. With the increasing of CaZrO3 content, the insulation resistivity was improved whereas the degradation under direct current electrical field was significant. Therefore, a proper CaZrO3 content is crucial to obtain high performance X8R nonreducible BaTiO3-based dielectrics.