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Piezoelectric properties of lead-free (Na0.5Bi0.5)TiO3–(Na0.5K0.5)NbO3–BaTiO3 ceramics

Published online by Cambridge University Press:  31 January 2011

Seung-Ho Lee
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Chang-Bun Yoon
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Sung-Mi Lee
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Hyoun-Ee Kim
Affiliation:
Department of Materials Science and Engineering, Seoul National University, Seoul 151-742, Korea
Kyung-Woo Lee
Affiliation:
Kyungwon Ferrite Ind. Co., Ltd., Shiheung-si, Kyonggi-do 429-450, Korea
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Abstract

The microstructural evolution and piezoelectric properties of lead-free ceramics (0.98-x)(Na0.5Bi0.5)TiO3x(Na0.5K0.5)NbO3–0.02BaTiO3 (0 ⩽ x ⩽ 0.98, abbreviated as (0.98-x)NBT–xNKN–0.02BT) were investigated. The effects of the amount of NKN on the crystal structure, microstructural evolution, and piezoelectric properties were examined. The 0.93NBT–0.05NKN–0.02BT ceramics having a lower NKN content gave good performances with piezoelectric properties of d33 = 140 pC/N and kp = 21%, because of the soft additive Nb5+ ions at the B sites. However, a paraelectric cubic phase was observed in the wide range of compositions between x = 0.1 and x = 0.9. At a higher NKN content of x > 0.9, a morphotropic phase boundary (MPB) between the tetragonal and orthorhombic phases was found in the 0.015NBT–0.965NKN–0.02BT ceramics, and the piezoelectric properties were enhanced (d33 = 135 pC/N, kp = 29%). The piezoelectric properties of this system were closely related to its crystal structure.

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Copyright © Materials Research Society 2007

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Piezoelectric properties of lead-free (Na0.5Bi0.5)TiO3–(Na0.5K0.5)NbO3–BaTiO3 ceramics
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