Microstructure and Dielectric Properties of Rare-Earth Doped BaTiO3 Ceramics
Microstructure and Dielectric Properties of Rare-Earth Doped BaTiO3 Ceramics
复制标题
稀土掺杂BaTiO3陶瓷的微观结构和介电性能
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
V. Pavlović
中科院分区：
文献类型：
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作者：
V. Mitić;V. Paunovic;V. Pavlović
用于本研究的掺杂有0.01，0.1和0.5wt%的Er_2O_3或Ho_2O_3的BaTiO_3的样品通过常规的固态反应制备。将试样在空气气氛中在1350°C下烧结4小时。使用配备EDS系统的扫描电子显微镜SEM对各种样品的晶粒尺寸和显微结构特征及其相组成进行了研究。对Er/BaTiO_3和Ho/BaTiO_3掺杂陶瓷的SEM分析表明，低浓度稀土离子掺杂样品的晶粒尺寸在10-60μm之间，而高浓度稀土离子掺杂样品的晶粒尺寸在2-10μm之间。我们还将分形方法应用于烧结陶瓷的显微结构分析，特别是对钛酸钡陶瓷介电性能的影响。这些分形效应已被用于更好地理解晶间电容器。
The specimens of BaTiO3 doped with 0.01, 0.1 and 0.5 wt% of Er2O3 or Ho2O3 used for this investigation were prepared by the conventional solid state reaction. The specimens were sintered at 1350°C in an air atmosphere for 4 hours. The grain size and microstructure characteristics for various samples and their phase composition was carried out using a scanning electron microscope SEM equipped with EDS system. SEM analysis of Er/BaTiO3 and Ho/BaTiO3 doped ceramics showed that in samples doped with a low level of rare-earth ions, the grain size ranged from 10–60μm, while with the higher dopant concentration the abnormal grain growth is inhibited and the grain size ranged between 2–10μm. We also applied the fractal method in microstructure analysis of sintered ceramics especially as influence on dielectric properties of BaTiO3 ceramics. These fractal effects have been used for better understanding of intergranular capacitors.