Abstract
The effects of rare earth oxide (Y 2O 3 and Dy 2O 3) on the microstructure and dielectric properties of Ba 0.7Sr 0.3 TiO 3(BST) series capacitor ceramics were studied, and the low of the influence of Y 2O 3 and Dy 2O 3 doping amount on the BST series capacitor ceramics was obtained. The strong correlation was observed between the dopant concentration and materials properties. It was also found out that different rare earth oxides and amount had different influences on BST. The experimental results showed that the dysprosium oxide (Dy 2O 3) could restrain abnormal grain growth during the sintering process and fining grain, the yttrium oxide(Y 2O 3) could decrease dielectric loss, and the permittivity could be increased by more than 40% compared with nominally undoped BST ceramics. The BST ceramics with optimum comprehensive properties was obtained, having high dielectric constant (ɛ = 3658), low dielectric loss (tanδ = 0.0093) and low dielectric constant temperature changing rate absolute value((Δɛ/ɛ) = 14.1%) while w(Dy 2O 3) = 1.00%.
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