Effects of Sb₂O₃ Addition on Dielectric Properties of Barium Strontium Titanate Based Ceramics

Abstract:

The dielectric properties of Sb₂O₃-doped (Ba_0.732Sr_0.26Nd_0.008)TiO_3.004 ceramics fabricated by conventional solid state method were investigated. The structure was identified by X-ray diffraction method and scanning electron microscope was also employed to observe the surface morphologies. It is confirmed that Sb₂O₃-doped (Ba_0.732Sr_0.26Nd_0.008)TiO_3.004 ceramics exhibit perovskite structure and with increasing Sb₂O₃ content Ba₆Ti₁₇O₄₀ (space group C2/c (15) ) forms as a secondary phase. The experimental results reveal that the addition of Sb₂O₃ into (Ba_0.732Sr_0.26Nd_0.008)TiO_3.004 ceramics reduce the dielectric constant and Curie temperature due to the substitution for A/B-sites with Sb³⁺ ions. The standing voltage increases with increasing Sb₂O₃ content while the dielectric loss and resistivity initially decrease and then increase with the increase of Sb₂O₃ concentration. The temperature dependence of dielectric properties at different frequencies was studied as well. It indicates that the tetragonal-cubic phase transition peak is suppressed as the Sb₂O₃ content increases and the peak value reduces with the increase of frequency.

• Periodical: Applied Mechanics and Materials (Volumes 138-139)
• Pages: 1280-1287
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.138-139.1280
• Online since: November 2011
• Authors: Chen Zhang, Yuan Fang Qu
• Keywords: Antimony Oxide, Barium Strontium Titanate, Dielectric Property, Perovskite

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