The Influences of NaNbO₃ on the Dielectric and Structure Characteristics of (1-X) (Na_0.5Bi_0.5)TiO₃–x NaNbO₃ Ceramics

Abstract:

Perovskite-based (1-x) (Na_0.5Bi_0.5)TiO₃-x NaNbO₃ [(1-x) NBT-x NN, x = 0.1, 0.2, 0.3 and 0.4] ceramics were sintered at 1080°C. Dielectric characteristics, crystalline structures, and Raman investigations were carried out on (1-x) (Na_0.5Bi_0.5)TiO₃-x NaNbO₃ ceramics. X-ray diffraction (XRD) patterns showed that NaNbO₃ ceramic would form a solid solution with (Na_0.5Bi_0.5)TiO₃ ceramic, and and unknown or second phases were not observable as well. NaNbO₃ ceramic diffused into the crystalline structure of (Na_0.5Bi_0.5)TiO₃ ceramic and (1-x) NBT_-x NN ceramics still revealed a rhombohedral structure. The temperature-dielectric constant curves showed that as NN content increased, the temperature to reveal the maximum dielectric constant (T_m) was raised, the depolarization temperature (T_d) was shifted to lower value, and the dielectric constant at Tm and the loss tangent at T_d gradually decreased. The Raman bands at 770 and 830 cm^-1 were attributed to the existence of the oxygen vacancies. In this study, the relaxor-type ferroelectric properties of NBT ceramic had been improved as NN ceramic was added.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 1064-1069
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.1064
• Online since: December 2011
• Authors: Chia Ching Wu, Ying Hsun Lin, Ping Shou Cheng, Chao Chin Chan, Cheng Fu Yang
• Keywords: Dielectric Characteristic, Na_0.5Bi_0.5TiO₃, NaNbO₃, RAMAN, Relaxor

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