Dielectric and energy storage properties of barium strontium titanate based glass-ceramics prepared by sol-gel method

被引:8
作者
Hu, Qingyuan [1 ,2 ]
Wang, Tong [1 ,2 ]
Jin, Li [1 ,2 ]
Wei, Xiaoyong [1 ,2 ]
机构
[1] Xi An Jiao Tong Univ, Minist Educ, Elect Mat Res Lab, Key Lab, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Peoples R China
关键词
BST; Sol-gel; Glass-ceramics; Dielectric breakdown; Energy storage; DENSITY;
D O I
10.1007/s10971-014-3403-8
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Ba0.6Sr0.4TiO3 based glass-ceramics were prepared by sol-gel process. Influences of B-Si-O glass content on the microstructure, dielectric, and energy storage properties of the BST based glass-ceramics have been investigated. Perovskite barium strontium titanate phase was found at annealing temperature 800 A degrees C. A secondary phase Ba2TiSi2O8 was detected and lowered by declining the mole ratio of element Si (from 50 to 25 mol%) in glass additive. Microstructural observation indicated that the microstructure homogeneity can be improved by glass addition till 2 mol%, while worsened by excessive glass concentrations. Due to relatively homogeneous microstructure, the maximum discharged energy density and breakdown strength were also obtained in samples with 2 mol% glass additive, which were found to be 0.553 J/cm(3) and 43.2 kv/mm, respectively. Microscopic observation of the breakdown area was performed and the mechanical failure, including the formation and accumulation of micro-cracks during the dielectric breakdown process, was considered to be the main cause of dielectric breakdown. Results of the charging and discharging energy densities show that the BST based glass-ceramics prepared by sol-gel method has a potential for pulse power applications.
引用
收藏
页码:522 / 529
页数:8
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