Dielectric Properties and Diffuse Phase Transition of Sol-Gel Derived 0.94(Bi0.5Na0.5)TiO3-0.06BaTiO3 Ceramics

Xiao Fang Cheng; Xin Gui Tang; Shao Gong Ju; Yan Ping Jiang; Qiu Xiang Liu

doi:10.4028/www.scientific.net/AMR.311-313.1481

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Dielectric Properties and Diffuse Phase Transition of Sol-Gel Derived 0.94(Bi_0.5Na_0.5)TiO₃-0.06BaTiO₃ Ceramics

Abstract:

The 0.94Bi_0.5Na_0.5TiO₃-0.06BaTiO₃ (abbreviated to BNT-BT) powder and ceramic was synthesized by sol-gel process. The phase structure and dielectric properties of the ceramics were investigated. The ceramic was sintering at 1000-1100 degree C for 2-4 h in air atmosphere, and the X-ray diffraction (XRD) results revealed that the samples was pure perovskite-type phase. The Curite temperature of BNT-BT ceramics was high up to 348 degree C. The temperature dependence of dielectric permittivity and loss revealed there were two phase transitions, which were from ferroelectric (tetragonal) to anti-ferroelectric (rhombohedral) and anti-ferroelectric to paraelectric (cubic) in BNT-BT ceramics. Diffuse phase transitions were observed in BNT and BNT-BT ceramics and the Curie-Weiss Exponent (CWE) were nearly 2.

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Advanced Materials Research (Volumes 311-313)

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1481-1484

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https://doi.org/10.4028/www.scientific.net/AMR.311-313.1481

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August 2011

Authors:

Xiao Fang Cheng, Xin Gui Tang, Shao Gong Ju, Yan Ping Jiang, Qiu Xiang Liu

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BNT-BT, Ceramic, Dielectric Property, Lead-Free, Perovskite-Type

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