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Effects of reoxidation on the dielectric and energy storage properties of Ce-doped (Ba,Sr)TiO3 ceramics prepared by hot-pressed sintering
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2020-06-30 , DOI: 10.1016/j.jeurceramsoc.2020.06.076
Y.M. Li , J.J. Bian

Fully densified Ba0.6Sr0.34Ce0.04TiO3 ceramics with small grain microstructure (0.3−0.8 μm) and high insulation (∼1014Ω cm) could be successfully obtained by hot-pressed sintering (HPS) coupled with subsequent thermal annealing in oxygen atmosphere. The effects of annealing on the microstructure, dielectric, electric and energy storage properties were investigated with scanning electron microscope, X-ray photoelectron spectroscope, impedance and ferroelectric analyzers. The preferential oxidation of grain boundaries to gains resulted in the formation of electrically inhomogeneous microstructure, which could be much improved by increasing O2 pressure during annealing process. The reduction of Ti4+ in the as-sintered HPS sample could be decreased with increasing the annealing temperature up to 1200 °C in flowing O2 gas, leading to the decrease in dielectric relaxation and corresponding permittivity/loss above room temperature. Maximum energy density of 1.75 J/cm3 could be obtained under the field of 235 kV/cm with the efficiency of 85 %.



中文翻译:

再氧化对热压烧结制备的Ce掺杂(Ba,Sr)TiO 3陶瓷介电和储能性能的影响

完全致密化的Ba 0.60.340.04的TiO 3个陶瓷具有小晶粒显微组织(0.3-0.8微米),高绝缘(〜10 14 Ω厘米)可以通过以下方式成功地获得热压烧结(HPS)加上后续氧气热退火大气层。用扫描电子显微镜,X射线光电子能谱仪,阻抗和铁电分析仪研究了退火对显微组织,介电,电和能量存储性能的影响。晶界优先氧化而获得的晶粒导致形成电不均匀的微观结构,通过增加O 2可以大大改善退火过程中的最大压力。在流动的O 2气体中,随着退火温度升高至1200°C,可以减少烧结HPS样品中Ti 4+的减少,从而导致介电弛豫和相应的介电常数/损耗高于室温而降低。在235 kV / cm的磁场下,可以达到1.75 J / cm 3的最大能量密度,效率为85%。

更新日期:2020-06-30
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