Microstructure and Dielectric Tunable Properties of Al_2O_3-doped Barium Strontium Titanate in the Paraelectric State

Abstract

Abstract: Al₂O₃-doped Ba_0.6Sr_0.4TiO₃(BST) ceramics were prepared by using conventional ceramic technology. The samples were analysed by
SEM and XRD. The results indicate that Al³⁺ behaves as a grain-growth helper below a certain doping level and also the
dopants have entered the unit-cell maintaining the perovskite structure of the solid solution. The dielectric constant and
dissipation factor decrease and the tunability increases by addition of Al₂O₃. The specimen at doping level of 0.8wt% has the optimal overall dielectric properties.

Key words: BST, Al₂O₃-doping, microstructure, dielectric tunablity

CLC Number:

TN384

LIANG Xiao-Feng,WU Wen-Biao,MENG Zhong-Yan. Microstructure and Dielectric Tunable Properties of Al_2O_3-doped Barium Strontium Titanate in the Paraelectric State[J]. Journal of Inorganic Materials.

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Microstructure and Dielectric Tunable Properties of Al_2O_3-doped Barium Strontium Titanate in the Paraelectric State

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