Dielectric and Piezoelectric Properties in the BiScO3–PbTiO3–PbO$\cdot$SnO2 Ternary System

概要

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The effect of Sn substitution on the dielectric and piezoelectric properties of BiScO3–PbTiO3 was investigated in the ternary system, ($1-x$){($1-y$)BiScO3–$y$PbO$\cdot$SnO2}–$x$PbTiO3 ($x=0.43--0.63$, $y=0.25--0.75$). The ferroelectric phase transition temperature near morphotropic phase boundary (MPB) decreased with increasing Sn content from 450°C ($x$, $y=0.64$, 0) down to ${\sim}250$°C for the composition with $x$, $y=0.46$, 0.75. Piezoelectric activity ($d_{33}=460--465$ and $k_{\text{p}}=0.54$) in Sn-substituted MPBs remained at similar levels to the pure 0.46BiScO3–0.64PbTiO3 MPB, with Sn content of up to $y=0.5$. However, further Sn-additions lead to decreased electromechanical performance and the formation of secondary phases such as SnO2. Broad temperature dependence of the permittivity near the ferroelectric phase transition was assessed by a diffuseness parameter $\delta$, which generally decreased with firing temperature in the range of 1050–1250°C. The temperature of the permittivity maximum ($T_{\text{max}}$) increased with measuring frequency, a characteristic consistent with relaxor ferroelectric materials.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-08-15