Effects of (Ca,Sb) on the Properties of Na_0.5Bi_2.5Nb₂O₉-based Bismuth Layered Structure Ferroelectric Ceramics

Abstract

Dense Na_0.5Bi_2.5Nb₂O₉ (NBN) based high temperature piezoelectric ceramics were prepared by solid-state reaction method. The effects of Ca²⁺ and/or Sb⁵⁺ in NBN pseudo-perovskite structure A and/or B site were studied. The introduction of Sb⁵⁺ into B site decreases Curie temperature T _c and piezoelectric constant d ₃₃, while Ca²⁺ into A site increases T _c and d ₃₃. Within the selected compositional range, the incorporation of Ca²⁺ and Sb⁵⁺ into A, B site, respectively, increased d ₃₃ compared to NBN. The optimum content of Ca²⁺ and Sb⁵⁺ are 3.0 mol%, 1.0 mol%, respectively, of which, the piezoelectric constant d ₃₃ is about 18.1 pC/N, T _c is about 790°C.

Keywords:

• BLSFs
• Na_0.5Bi_2.5Nb₂O₉
• high temperature piezoelectric

Acknowledgment

This work was supported by the National Natural Science Foundation of China (No. 61201064).