Abstract
In this paper, Pb 0.55−(3 y /2)Ce y Ba 0.45Nb 2O 6 ceramics with tetragonal tungsten–bronze structure prepared through the solid-state reaction method and characterized for phase formation, density, dielectric and piezoelectric properties are reported. The XRD analysis showed the presence of a tetragonal tungsten–bronze structure, which intensified with increasing Ce content. The stability of the tetragonal tungsten–bronze phase has been discussed with the electronegativity difference and the tolerance factor. The Curie temperature ( T c) systematically lowered when Ce was incorporated into tetragonal PBN lattice. The room-temperature dielectric constant ( ε RT) of Ce-modified lead barium niobate (PBN) compositions has enhanced from C 0 to C 3 and thereafter decreased. The influence of Ce on piezoelectric properties of tetragonal PBN system has been evaluated. The piezoelectric coefficients ( d, g, k and Q m) were characterized. The C 3 composition exhibited optimum piezoelectric properties in the series, and this composition could be suitable for piezoelectric applications.
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