Dielectric and piezoelectric properties of (1−x)Ba0.7Sr0.3TiO3−xBa0.7Ca0.3TiO3 perovskites

Dielectric and piezoelectric properties of (1−x)Ba0.7Sr0.3TiO3−xBa0.7Ca0.3TiO3 (BST−xBCT) (x=0.2–0.9) perovskite ceramics have been investigated. BCT has fully incorporated into BST lattice, forming a complete perovskite solid solution, whose lattice constant χ decreases almost linearly with increase in x from 0.2 to 0.4, while showing an anomalous expansion at 0.4

► BCT is fully incorporated into BST lattice forming a complete perovskite solid solution.
► χ decreases linearly with increase in x from 0.2 to 0.4, while showing an expansion at 0.4► TC increases linearly with increase in x, whereas TO–T decreases linearly except at x=0.5.
► Strain and d33 decrease with increase in x, whereas kp reaches a maximum (17.0%) at x=0.6.