Effect of B-site Zr and Hf substitution on ferroelectric polar order for tetragonal tungsten bronze ceramic

Wenbin Feng
Sidi Long
Yi Wan
Dunpu Zhang

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Publication date

April 2022

DOI

10.1080/21870764.2022.2062809

Publisher

Informa UK Limited

Journal

Journal of Asian Ceramic Societies

Abstract

Lead free ferroelectric ceramic Ba4Sm2Hf4Nb6O30(BSHN) with tungsten bronze structure was synthesized and characterized. The effect of B-site cation electron configuration (Hf and Zr) on origin of ferroelectricity and polarization reversal was also studied in detail. The X-ray diffraction (XRD) pattern was indexed with tetragonal tungsten bronze in P4bm space group for BSHN. Obvious dielectric anomaly was observed in the temperature dependent permittivity curve, and quite large thermal hysteresis was obtained from the differential scanning calorimetry (DSC) result. While at lower temperature (<TC), there are two distinct dielectric relaxations for BSHN, respectively related to the activation of frozen polar region and activation of the fully...