Influence of calcium doping on microstructure, dielectric and electric properties of BaBi2Nb2O9 ceramics

Diana Szalbot, Małgorzata Adamczyk, Beata Wodecka-Duś, Jolanta Dzik, Michał Rerak, Kamil Feliksik
2018 Processing and Application of Ceramics  
Barium bismuth niobiate (BaBi 2 Nb 2 O 9 ) ceramics modified by calcium were prepared by solid state synthesis and two-step sintering process. An impact of calcium substitution on the A site of perovskite block is presented. The investigations are focused on dielectric as well as electric aspects of the modification. The presented results reveal that the concentration of a space charge is not preserved, what is surprising due to the homovalent nature of the dopant and no reason for creating
more » ... on for creating additional lattice defects and charges connected. However, not only the valence of ions, but also the calcium-oxygen and barium-oxygen bond strength should be taken into consideration. Since the calcium-oxygen bond is probably weaker the loss of the bismuth oxide is expected to increase with an increase in the calcium content. Such a scenario results in appearance of a large number of negative charge carriers connected with unsaturated oxygen ions.
doi:10.2298/pac1802171s fatcat:bum2a2zlyfgcva4635bvbtiojy