Phase structure and electrical properties of La₂O₃-doped BiInO₃-PbTiO₃ ceramics with high curie temperature

Abstract

The phase structure and electrical properties of pure and La₂O₃-doped Bi-InO₃-PbTiO₃ (BI-PT) ceramics were studied respectively. In (1−x)BI-xPT (x=0.72—0.80) ceramics, the stability of tetragonal phase increased with increasing x, and pure perovskite structure was obtained for x=0.80 ceramics. The phase transition temperature range was between 575 °C and 600 °C for x=0.72–0.80 ceramics, higher than that of PT (∼490 °C). The c/a ratio almost linearly decreased with increasing La₂O₃ content in x=0.80 ceramics. It is believed that Pb²⁺ vacancies were formed by La³⁺ substituting Pb²⁺ in La₂O₃-doped BI-PT ceramics. T _c shifted to lower temperature by 30 °C/mol% La₂O₃. The maximum dielectric constant 8557 around 559 °C was exhibited in 0.5mol%-doped BI-0.80PT ceramics. La₂O₃-doped ceramics could be poled resulting from decreasing of c/a ratio and improving of dielectric loss and resistivity. The maximum piezoelectric coefficient d ₃₃ was 12 pC/N for 2mol%-doped BI-0.80PT ceramics.

Keywords

BiInO₃-PbTiO₃ / perovskite / dielectric property

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