Microstructures and dielectric properties of Ba0.4Sr0.6TiO3 ceramics with BaO-TiO2-SiO2 glass-ceramics addition
Microstructures and dielectric properties of Ba0.4Sr0.6TiO3 ceramics with BaO-TiO2-SiO2 glass-ceramics addition
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DOI：
10.1016/j.jallcom.2013.09.072
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发表时间：
2014-01-25
影响因子：
6.2
通讯作者：
Gao, Pan
中科院分区：
文献类型：
--
作者：
Wu, Ting;Pu, Yongping;Gao, Pan
以BaO-TiO 2-SiO2系微晶玻璃为添加剂，采用固相反应法制备了Ba 0. 4Sr 0. 6 TiO 3储能陶瓷。研究了微晶玻璃含量对Ba0.4Sr0.6TiO3陶瓷的烧结行为、晶体结构、显微结构、介电性能和储能性能的影响。SEM-EDX分析表明，BaO-TiO 2-SiO2系微晶玻璃中的玻璃相以液相形式存在于晶界，导致烧结温度降低。XRD结果表明，Ba0.4Sr0.6TiO3陶瓷为钙钛矿结构，BaO-TiO 2-SiO2微晶玻璃中出现了BaTi 2Si 2 O 8第二相。BaTi_2Si_2O_8铁电体晶相的存在提高了BaO-TiO_2-SiO_2微晶玻璃的介电常数，抑制了BaO-TiO_2-SiO_2微晶玻璃对Ba_（0.4）Sr_（0.6）TiO_3陶瓷介电常数的降低。由于晶粒尺寸的减小，陶瓷的击穿强度得到了显著的提高，当微晶玻璃添加量为9wt%时，陶瓷的平均击穿强度最高，为16.51 kV/mm，是纯Ba 0.4Sr 0.6TiO 3陶瓷的1.8倍。添加5wt%微晶玻璃的样品的储能密度为0.6045J/cm（3），这归因于相对较高的介电常数和击穿强度。(c)2013爱思唯尔有限公司版权所有。
The Ba0.4Sr0.6TiO3 energy storage ceramics with BaO-TiO2-SiO2 glass-ceramics additive were prepared via the solid state reaction route. The effects of glass-ceramics content on the sintering behavior, crystal structure, microstructure, dielectric property and energy storage property of Ba0.4Sr0.6TiO3 ceramics have been investigated. SEM-EDX spectra reveal that the glass phase in the BaO-TiO2-SiO2 glass-ceramics existed at grain boundary as liquid phase resulting in the decrease of sintering temperature. XRD results show that Ba0.4Sr0.6TiO3 ceramics exhibited a perovskite structure and emerged the secondary phase BaTi2Si2O8 from the crystal phase in the BaO-TiO2-SiO2 glass-ceramics. The ferroelectrics crystal phase BaTi2Si2O8 increased the dielectric constant of BaO-TiO2-SiO2 glass-ceramics, which inhibited the decrease of dielectric constant of Ba0.4Sr0.6TiO3 ceramics with BaO-TiO2-SiO2 glass-ceramics addition. The breakdown strength was notably improved due to the reduction of the grain size and the samples with 9 wt% glass-ceramics addition showed the highest average breakdown strength of 16.51 kV/mm, which was 1.8 times higher than that of pure Ba0.4Sr0.6TiO3 ceramics. The energy storage density of samples with 5 wt% glass-ceramics addition was 0.6045 J/cm(3) attributed to the relatively high dielectric constant and breakdown strength. (c) 2013 Elsevier B.V. All rights reserved.