In this paper, the ceramic compositions
($1-x$
)Pb1−w−yLawSry(ZrzTi$_{1-z})_{(1-w/4)}$
O3-xBaTiO3,
where x = 0.15, 0.25, 0.35 and 0.45, fabricated through solid state reaction
method were investigated for phase formation, microstructure, density,
dielectric and piezoelectric properties. The combination of the two
perovskite structured stoichiometric compositions (i.e., isovalent Sr2+
modified PLZT and BaTiO3) indicated that tetragonality enhanced further
due to BaTiO3 concentration in PLSZT lattice. The BaTiO3 in PLSZT
ceramics were homogeneously distributed within the two perovskite structured
solid solutions. The dielectric characterization indicated that $\varepsilon
_{RT}$
enhanced while $\tan\delta _{RT}$
and Tc decreased with
increasing BT additions into PLSZT perovskite. The maximum $\varepsilon
_{RT}$ = 2986 and $\varepsilon _{T_c}$
= 21468 were found in
0.55PLSZT-0.45BT ceramic system. The piezoelectric properties were
influenced by both BaTiO3 and Sr2+ modified PLZT perovskite. The
influence of BT modified PLSZT ceramics showed significant variations that
has been discussed. The piezoelectric properties remarkably enhanced with
maximum ($k_{p} = 0.541$
and $d_{33} = 518$
pC/N) values in the
0.55PLSZT-0.45BT composition and thus, could be a promising candidate among
this series for possible capacitor, sensor and actuator applications.
