Structures and temperature-dependent electrical properties in Ba0.8Sr0.2TiO3–BiAlO3 electrostrictive ceramics

Abstract: Lead-free piezoceramics of (1− x)Ba0.8Sr0.2TiO3–xBiAlO3 [(1− x)BST–xBA (0≤ x ≤0.12)] have been synthesized and the structures and properties have been investigated systemically. X-ray diffraction patterns indicated that the solid solution limit is close to x =0.04, and a morphotropic phase boundary (MPB) separating tetragonal and pseudocubic phases exists near x =0.02. The ferroelectricity weakens monotonously with increasing x, accompanied by weakened butterfly shaped bipolar strain–electric field curves. The temperature dependent properties of the composition with x =0.02 have been typically investigated, showing that with increasing temperature, the ferroelectricity tends to be weakened. Pure electrostrictive effect has been found in the compositions with x =0.02 and 0.03 close to room temperature temperature. Based on the results, the effects of BA on structures and electric properties were discussed. [Copyright &y& Elsevier]