The Effects of Microstructure on Dielectric and Piezoelectric Properties of Bilayer Ceramic Between Ba0.85Ca0.15Zr0.1Ti0.9O3 and BaTiO3

Abstract

Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT), BaTiO3 (BT) ceramics, and BCZT/BT bilayer ceramic were fabricated by a solid-state reaction method. The used sintering condition for all ceramics was at 1,400 oC for 4 hrs. The BCZT/BT bilayer ceramic had a tetragonal structure with a second phase of starting oxides. The scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) confirmed the bilayer structure between BCZT and BT systems. The BCZT/BT bilayer ceramic promoted two-phase transition temperatures around 100 oC and 160 oC, which belonged to BCZT and BT systems, respectively. The dielectric and piezoelectric properties of BCZT/BT bilayer ceramic were between BT and BCZT pure ceramics. The interface between BCZT and BT layer decreased the maximum dielectric constant of the bilayer ceramic. The result revealed that the bilayer ceramic had each system's characteristics and electrical properties, which might be applied in bilayer dielectric devices.