Effect of Sintering Condition on the Microstructure and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3 - Bi0.5(Na0.95K0.05)0.5TiO3 Ceramics

Chun Huy Wang

doi:10.4028/www.scientific.net/KEM.656-657.45

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 656-657Effect of Sintering Condition on the...

Effect of Sintering Condition on the Microstructure and Electrical Properties of Lead-Free (Na_0.5K_0.5)NbO₃ - Bi_0.5(Na_0.9₅K_0.₀₅)_0.5TiO₃ Ceramics

Abstract:

(Na_0.5K_0.5)NbO₃ with 0~5 mole% Bi_0.5(Na_0.95K_0.05)_0.5TiO₃ has been prepared following the conventional mixed oxide process. It can be concluded that the NKN-BNKT ceramics have orthorhombic structures in the case x≤ 0.02. With increasing BNKT content (x=0.03 to 0.05), however, the structure changes from orthorhombic to rhombohedral phase. Above results demonstrated that the MPB between orthorhombic and rhombohedral phases exits in the solid solution with the BNKT content of x=0.02. For 0.98(Na_0.5K_0.5)NbO₃-0.02Bi (Na_0.95K_0.05)TiO₃ ceramics, the electromechanical coupling coefficients of the planar mode k_p and the piezoelectric constant d₃₃ reach 0.28 and 155 p/CN, respectively, at the sintering of 1100 °C for 3 h. Dielectric and piezoelectric properties have maximum values at the sintering temperature of 1100 °C for 5 h. For 0.98(Na_0.5K_0.5)NbO₃-0.02Bi_0.5(Na_0.95K_0.05)_0.5TiO₃ ceramics, the electromechanical coupling coefficients of the planar mode k_p and the piezoelectric constant d₃₃ reach 0.30 and 170, respectively, at the sintering of 1100 °C for 5 h. The effect of prolonging the sintering time to the 0.98(Na_0.5K_0.5)NbO₃-0.02Bi_0.5(Na_0.95K_0.05)_0.5TiO₃ system is a helpful method on ceramic processing to improve densification and properties..

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Key Engineering Materials (Volumes 656-657)

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45-50

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https://doi.org/10.4028/www.scientific.net/KEM.656-657.45

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Online since:

July 2015

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Chun Huy Wang*

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Dielectric Property, Electromechanical Transducer, Lead-Free Piezoceramics, Piezoelectric Property, Sintering

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