Phase Structure and Piezoelectric Properties of (K0.5Nb0.5)NbO3 - CaZrO3 Ceramics

Pyo Chun Myoung

doi:10.4028/www.scientific.net/AMR.936.149

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 936Phase Structure and Piezoelectric Properties of...

Phase Structure and Piezoelectric Properties of (K_0.5Nb_0.5)NbO₃- CaZrO₃ Ceramics

Abstract:

Lead-free piezoelectric ceramics of (1-x)(K_0.5Na_0.5)NbO₃- xCaZrO₃ (abbreviated as KNN-CZ, x = 0 ~ 0.04) were synthesized by the conventional solid state method. Their phase structures and piezoelectric properties were investigated with x-ray diffraction (XRD), Scanning Electron Microscope (SEM), d₃₃ meter and Impedance Analyzer. KNN-CZ samples exhibit only pure perovskite phases with a small monoclinic distortion. It was observed that the lattice parameter b has a maximum at x = 0.02 but the monoclinic distortion angle β shows a minimum at the same composition. From the dependence of the lattice parameters (a, b, c, β) and cell volume on the content of CZ, it is considered that the intermediate phase transition exists near at x = 0.02. Piezoelectric properties show the maximum value of d33 = 121 pC/N and kp = 0.35 for the sample with x = 0.02, which seems to be due to the co-existence of the two different phases.

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Advanced Materials Research (Volume 936)

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149-153

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https://doi.org/10.4028/www.scientific.net/AMR.936.149

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Online since:

June 2014

Authors:

Pyo Chun Myoung*

Keywords:

CaZrO₃, KNN, Lattice Parameter, Phase Transition, Piezoelectric Constant

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