Preparation of 0.83(Bi0.5Na0.5)TiO3–0.17BaTiO3 thick films by screen printing

Abstract

Preferentially oriented 0.83(Bi0.5Na0.5)TiO3–0.17BaTiO3 (BNT–17BT) thick films were prepared by adopting substrates with different thermal expansion coefficients, and the properties of the films were analyzed. The thick films were prepared by screen printing. The calcination temperature required to form BNT–17BT thick films without heterogeneous compounds was studied. The c-domain volume fraction (αc) of the BNT–17BT thick films prepared on 3 mol % Y2O3-stabilized ZrO2 (YSZ) substrates with Pt bottom electrodes (BNT–17BT/YSZ) was larger than that of the BNT–17BT thick films prepared on Al2O3 substrates with Pt bottom electrodes (BNT–17BT/Al2O3) because the BNT–17BT/YSZ exhibited greater compressive stress than the BNT–17BT/Al2O3. The temperature dependence curves of the dielectric constants of the bulk ceramics and BNT–17BT/Al2O3 showed a shoulder with frequency dispersion at approximately 200 °C, whereas this shoulder was not observed in the curves of the BNT–17BT/YSZ. The remanent polarization (Pr) of the BNT–17BT/YSZ was larger than that of the BNT–17BT/Al2O3. At temperatures higher than 180 °C, the Pr of the BNT–17BT/YSZ was larger than that of the bulk ceramics. The Pr of the BNT–17BT/YSZ was larger than that of the BNT–17BT/Al2O3 because the BNT–17BT/YSZ exhibited αc values larger than those of the BNT–17BT/Al2O3.