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Effect of the Addition of CaZrO3 and LiNbO3 on the Phase Transitions and Piezoelectric Properties of K0.5Na0.5NbO3 Lead‐Free Ceramics

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Abstract:

The (1‐xy)K0.5Na0.5NbO3xCaZrO3yLiNbO3 (KNLNCZ‐xy) lead‐free piezoelectric ceramics were fabricated by conventional technique, and the effect of the addition of CaZrO3 and LiNbO3 on the phase transitions and piezoelectric properties of the KNN‐based ceramics was investigated. The addition of CaZrO3 will shift the orthorhombic‐rhombohedral transition temperature of the ceramics to above room temperature, and with the increase of the CaZrO3 additives, a dielectric peak rises up near the orthorhombic‐tetragonal phase transition of the ceramics resulting in the spread of the ferroelectric‐paraelectric phase transition over a rather wide temperature range due to polar nanoregions arising from composition fluctuation. For x = 0.05, the addition of LiNbO3 is effective to shift the T R‐O and T O‐T downward and T C upward in KNLNCZ‐0.05‐y ceramics. Optimum piezoelectric properties (d 33 = 216 pC/N and k p = 42.9%) were obtained for the KNLNCZxy ceramics with x = 0.05 and y = 0.07 due to the decrease of T O‐T to be around room temperature.

Document Type: Research Article

DOI: https://doi.org/10.1111/j.1551-2916.2011.04660.x

Publication date: 2011-12-01

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