Dielectric Properties of CaTiO3 Doped Ba0.65Sr0.35TiO3 (BST) AC High Voltage Capacitor Ceramics

Mu Sheng Huang; Xin You Huang; Chun Hua Gao

doi:10.4028/www.scientific.net/AMR.760-762.767

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 760-762Dielectric Properties of CaTiO3 Doped...

Dielectric Properties of CaTiO₃ Doped Ba_0.65Sr_0.35TiO₃ (BST) AC High Voltage Capacitor Ceramics

Abstract:

The dielectric properties of (1-x) Ba_0.65Sr_0.35TiO₃-xCaTiO₃(x=0, 0.03, 0.06, 0.10, 0.15) ceramics were investigated. XRD analysis shows that CaTiO₃ doping can be fully incorporated into the perovskite lattice of BST except increasing peak intensity. The experimental result shows that doping a certain amount of CaTiO₃ could form fine crystal grain structure, enhance the density, and enhance Ac withstand voltage strength, increase dielectric constant and decrease the dielectric loss. While doping excessive CaTiO₃ could make the geometrical distortion, increase the porosity and grain size, develop the internal stresses and finally lead to the dielectric constant decrease. The BSTC ceramics sintered at 1350 °C for 2 h with 6 mol.% CaTiO₃doping has the best properties, ε_rof 3862, tanδ of 0.046, E_b of 5 kV/mm (AC), the value of C/C ranges is-26.7%~-66.2% in-50 °C ~ 100 °C temperature range.

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Periodical:

Advanced Materials Research (Volumes 760-762)

Pages:

767-771

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.760-762.767

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Online since:

September 2013

Authors:

Mu Sheng Huang, Xin You Huang, Chun Hua Gao

Keywords:

AC Capacitor Ceramics, BST Ceramic, CaTiO₃ Doped, Dielectric Property

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