Temperature Dependence of Electric Properties of [Bi0.5(Na1-xAgx)0.5]1-yBayTiO3 Ceramics

概要

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The temperature dependence of the piezoelectric and dielectric properties of lead-free piezoelectric ceramics, namely, [Bi0.5(Na1-xAgx)0.5]1-yBayTiO3 (abbreviated as BNBT$y$–$x$Ag, $x=0--6$ mol % and $y=0--10$ mol %), was investigated, and the features of the depolarization temperature ($T_{\text{d}}$) of the ceramics were discussed. The temperature dependence of the piezoelectric properties shows that the piezoelectric constant ($d_{33}$) decreases sharply and that the piezoelectricity almost disappears at $T_{\text{d}}$ for all of the ceramic samples. With an increase in the amount of Ag+, the $T_{\text{d}}$ of the BNBT6–$x$Ag ceramics decreases. Moreover, the $T_{\text{d}}$ of the BNBT$y$–4Ag ceramics decreases with an increase in the amount of Ba2+ up to 6 mol %, and then increases with a further increase in the amount of Ba2+. Furthermore, the temperature dependence of the dielectric properties shows that the characteristic of the diffuse phase transition is more evident for the compositions near the morphotropic phase boundary (MPB).
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-11-15