Preparation of [110] Grain Oriented Barium Titanate Ceramics by Templated Grain Growth Method and Their Piezoelectric Properties

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[110]-oriented barium titanate (BaTiO3) ceramics were prepared by templated grain growth (TGG) method using [110]-oriented BaTiO3 platelike particles as a template and hydrothermal BaTiO3 sphere particles with different particle sizes as a matrix. The degree of orientation along the [110] direction, $F_{110}$, was measured using an X-ray diffraction (XRD) pattern by the Lotgering method. To obtain both a high density and a high $F_{110}$, the preparation conditions were optimized as functions of matrix particle size, volume fraction of the template to the matrix, and sintering temperature. As for the results, BaTiO3-grain-oriented ceramics with a high density of more than 96% were successfully prepared despite various $F_{110}$ values from 0 to 98%. Scanning electron microscopy (SEM) revealed that their average grain sizes were always approximately 75 μm despite various $F_{110}$ values and there were no anisotropic microstructures. These grain-oriented BaTiO3 ceramics were poled at 100 °C, and their piezoelectric properties were measured using a resonance–antiresonance method and a piezo $d_{33}$ meter for $d_{31}$ and $d_{33}$ piezoelectric constants. As for the results, the $d_{31}$ values were almost constant at $-50$ pC/N despite various $F_{110}$ values, while the $d_{33}$ values increased with increasing $F_{110}$ values, and at around an $F_{110}$ of 85%, $d_{33}$ reached a maximum of 788 pC/N.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-10-30

Preparation of [110] Grain Oriented Barium Titanate Ceramics by Templated Grain Growth Method and Their Piezoelectric Properties

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