Abstract
In this investigation, (Pb 0.988 − y Sr 0.012 Ba y )(Zr 0.51 Ti 0.47 Nb 0.02 )O 3 (PSBZTN) where y = 0, 0.5, 1.0 and 1.5 mole% crystalline solid solutions have been fabricated by solid-state reaction method. A ferroelectric phase change occurred from rhombohedral to tetragonal MPB of (Pb1 − x − y Sr x Ba y )(Zr1 − z − k Ti z Nb k )O3was observed for y = 0.5 mole% Ba and further Ba increment resulted in strong tetragonality. Microstructure studies reveal that grain growth inhibited while the density profile showed the inter-diffusion between multiple ions and promoted densification. The isovalent substitutions of Ba 2 + and Sr 2 + cations at the Pb site and donor pentavalent Nb 5 + at Zr/Ti site enhanced the dielectric constant (ϵ RT = 2384) while decreasing the phase transition temperature (Tc). The substitution of 1.5 mole% Ba for Pb evidently increased (Pr = 32.46 μ C/cm 2 ) and (Ps = 38.44 μ C/cm2) with relatively decreasing coercive field.
Acknowledgments
The author would like to thank University of Concepcion for their financial assistance extended and Ms. C. Neeladevi for the technical assistance extended during this work.