Electrical Properties of K0.5Na0.5NbO3 Lead-free Piezoceramics by Pressureless Sintering

doi:10.3724/SP.J.1077.2013.12659

Abstract

Abstract: Lead-free piezoceramics K_0.5Na_0.5NbO₃ were prepared by pressureless sintering. The effects of sintering temperature on the density and electrical properties of KNN ceramics were investigated. The results show that the density of the KNN ceramics changes dramatically in a narrow temperature range of 1065-1120℃. The density of the ceramic sintered at 1100℃ reaches 4.35 g/cm³ (95% of the theoretical density). The ceramic sintered at 1100℃ shows the best electrical properties: the maximum piezoelectric coefficient of about 118 pC/N, the maximum relative dielectric constant of 538, the minimum dielectric loss of 4.70%, the remanent polarization of 15.37 μC/cm² and the coercive electric field of 13.16 kV/cm. The phase transformation temperature from orthorhombic to tetragonal is about 206℃, and the Curie temperature is 410℃.

Key words: potassium sodium niobate ceramics, lead-free piezoceramic, pressureless sintering

CLC Number:

TM282

ZHANG Dong-Sheng, TIAN Ai-Fen. Electrical Properties of K_0.5Na_0.5NbO₃ Lead-free Piezoceramics by Pressureless Sintering[J]. Journal of Inorganic Materials, 2013, 28(9): 967-970.

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Electrical Properties of K_0.5Na_0.5NbO₃ Lead-free Piezoceramics by Pressureless Sintering

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