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Dielectric and Piezoelectric Properties in the BiScO₃–PbTiO₃–PbO·SnO₂ Ternary System

Tae-Ho Song, Richard E. Eitel, Thomas R. Shrout and Clive A. Randall

(Received March 25, 2004; accepted April 12, 2004; published August 10, 2004)

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–yPbO·SnO₂}–xPbTiO₃ (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 ∼250°C for the composition with x, y=0.46, 0.75. Piezoelectric activity (d₃₃=460–465 and k_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 δ, which generally decreased with firing temperature in the range of 1050–1250°C. The temperature of the permittivity maximum (T_max) increased with measuring frequency, a characteristic consistent with relaxor ferroelectric materials.

URL: http://jjap.jsap.jp/link?JJAP/43/5392/
DOI: 10.1143/JJAP.43.5392

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