Fabrication and Piezoelectric Properties of Textured (Bi1/2K1/2)TiO3 Ferroelectric Ceramics

概要

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Textured (Bi1/2K1/2)TiO3 (BKT) ceramics were prepared by a reactive templated grain growth (RTGG) method to improve their piezoelectric properties. Also, a hot-pressing (HP) method was modified on the basis of RTGG method to obtain dense ceramics and promote the grain orientation. The textured BKT ceramics prepared by the RTGG and HP methods exhibited a relatively high orientation factor $F$ of 0.82 and a high density ratio of 95–99%. Scanning electron microscopy (SEM) micrographs of the textured HP-BKT indicated a textured and poreless microstructure. In addition, the resistivity of the textured HP-BKT was $1.73\times 10^{13}$ $\Omega$$\cdot$cm. The piezoelectric strain constant $d_{33}$ determined by means of resonance and antiresonance method was 125 pC/N for the direction parallel to the sheet-stacking direction of the RTGG process. From the measurement of field-induced stain, the normalized $d_{33}{}^{*}$ ($=S_{\text{max}}/E_{\text{max}}$) at 80 kV/cm were 127 and 238 pm/V on the randomly oriented and textured samples ($F=0.82$) for the ($\parallel$) direction, respectively.
2010-09-25