The influence of interface on the dielectric and tunable properties of BCZT/BZT ceramic

Bilayer structure may be a good and convenient strategy to enhance the tunable properties of ceramics, while it has been investigated rarely. In this work, BCZT, BCZT/BZT and BZT ceramics are prepared via solid-state sintering to investigated the influence of interface on the dielectric and tunable properties. An undeteriorated tunability (43%) and reduced loss tangent (0.0031) are achieved in BCZT/BZT ceramic. Shannon additive rule and series equivalent circuit model are used to understand the undeteriorated tunability. Current density-electric field hysteresis loops and insulation resistance confirm that the lower loss tangent achieved in BCZT/BZT ceramic results from the interrupted moving paths of carriers at interface. Due to the reduced loss tangent and undeteriorated tunability, the FOM of BCZT/BZT ceramic (138) is higher than that of BCZT (69) and BZT (97) ceramics. The results make BCZT/BZT ceramic have a great application potential in tunable microwave devices.