Creating adjoining polymorphic phase transition (PPT) regions in ferroelectric (Ba,Sr)(Zr,Ti)O3 ceramics

Abstract

In this work, we report the polymorphic phase transitions(PPT) in ferroelectric Ba 0.95 Sr 0.05 Zr x Ti (1-x) O 3 (BSZT, x=0.01~0.10) ceramics synthesized by using a solid-state reaction method. The doping elements and composition ratios were selected to create adjoining PPT phase boundaries near room temperature, hence to achieve a broadened peak of piezoelectric performance with respect to composition. The temperature-composition phase diagram was constructed and the effects of PPT on the electromechanical and ferroelectric properties of the ceramics were investigated. It was revealed that the two adjacent PPT regions at room temperature showed different characteristics in property enhancement. However, due to the proximity of the phase boundaries, Ba 0.95 Sr 0.05 Zr x Ti (1-x) O 3 ceramics in a fairly broad range of compositions (0.02≤x≤0.07) showed excellent piezoelectric properties, 1 Certain commercial equipment, instruments, or materials are identified in this paper to adequately specify the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose.