Fabrication and Piezoelectric Properties of Grain-Oriented (Bi1/2K1/2)TiO3–BaTiO3 Ceramics

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The piezoelectric properties of ($1 - x$)(Bi1/2K1/2)TiO3–$x$BaTiO3 ($x = 0.1$) [abbreviated as BKT–BT10] ceramics prepared by ordinary solid-state reaction and reactive templated grain growth (RTGG) using platelike Bi4Ti3O12 particles as a template were investigated. All samples showed a single-phase perovskite structure, and relative densities compared with theoretical densities were all higher than 95%. The degree of orientation $F$ was determined by the Lotgering method using an X-ray diffraction (XRD) pattern. The $F$ values of textured BKT–BT10 ceramics were relatively low at ${\sim}35$%. However, field-induced strains and piezoelectric properties of BKT–BT10 ceramics were improved by grain orientation. In particular, the piezoelectric strain constant $d_{33}$ and the strain of textured BKT–BT10 ceramics in a direction parallel ($\parallel$) to the tape stacking direction were 84.5 pC/N and 168 pm/V (at 80 kV/cm), respectively.
2008-05-25