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

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Abstract

The microstructural evolution and piezoelectric properties of lead-free ceramics (0.98-x)(Na0.5Bi0.5)TiO3–x(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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Authors and Affiliations

  1. Department of Materials Science and Engineering, Seoul National University, Seoul, 151-742, Korea

    Seung-Ho Lee, Chang-Bun Yoon, Sung-Mi Lee & Hyoun-Ee Kim

  2. Kyungwon Ferrite Ind. Co., Ltd., Shiheung-si, Kyonggi-do, 429-450, Korea

    Kyung-Woo Lee

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  1. Seung-Ho Lee
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  2. Chang-Bun Yoon
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Correspondence to Hyoun-Ee Kim.

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Lee, SH., Yoon, CB., Lee, SM. et al. Piezoelectric properties of lead-free (Na0.5Bi0.5)TiO3–(Na0.5K0.5)NbO3–BaTiO3 ceramics. Journal of Materials Research 23, 115–120 (2008). https://doi.org/10.1557/JMR.2008.0004

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