Microstructure and electrical properties of high curie temperature (1 − x)(0.1BiYbO3–0.9PbTiO3)–xPb(Yb0.5Nb0.5)O3 ceramics

(1 − x )(0.1BiYbO 3 –0.9PbTiO 3 )– x Pb(Yb 0.5 Nb 0.5 )O 3 (PYN-BYPT) ceramics were prepared by the conventional solid state reaction. The effect of Pb(Yb 0.5 Nb 0.5 )O 3 content on the microstructure and electrical properties of ceramics was investigated. The results show that there are two phases, perovskite phase and pyrochlore phase (Yb 2 Ti 2 O 7 ), coexisting in PYN-BYPT ceramics when the content of Pb(Yb 0.5 Nb 0.5 )O 3 increases from 0.1 to 0.3 mol. With increasing Pb(Yb 0.5 Nb 0.5 )O 3 content, the pyrochlore phase Yb 2 Ti 2 O 7 increases, T C decreases and d 33 increases firstly and then decreases. When the content of Pb(Yb 0.5 Nb 0.5 )O 3 increases from 0.4 to 0.9 mol, perovskite phase and pyrochlore phase (Pb 2 Nb 2 O 7 ) coexists in the ceramics. The contents of Pb 2 Nb 2 O 7 and the T C decrease. PYN-BYPT ceramics with 0.2 mol Pb(Yb 0.5 Nb 0.5 )O 3 show the optimal piezoelectric properties, with ε r of 231.4, tan δ of 0.015, d 33 of 20 pC/N, and T C of 523.2 °C, which makes it a promising material for high-temperature (up to 500 °C) piezoelectric applications.