Title

Microstructure and electrical properties of Nb and Mn co-doped CaBi4Ti4O15 high temperature piezoceramics obtained by two-step sintering

RIS ID

117881

Publication Details

Shen, Z., Luo, W., Tang, Y., Zhang, S. & Li, Y. (2016). Microstructure and electrical properties of Nb and Mn co-doped CaBi4Ti4O15 high temperature piezoceramics obtained by two-step sintering. Ceramics International, 42 (6), 7868-7872.

Abstract

Bismuth layer structural ceramics with a composition of CaBi4Ti3.95Nb0.05O15+0.2 wt% MnO2 (CBTN-Mn) were prepared by a two-step sintering (TSS) approach. The effect of sintering process on the microstructure and its relationship with the electrical properties of the CBTN-Mn ceramics was investigated. A dense microstructure with small and homogeneous grains was obtained under an optimized two-step sintering condition, leading to a strongly enhanced piezoelectric constant (d33=27 pC/N). In addition, this ceramic also possesses high Curie temperature (Tc=790 °C), low dielectric loss (tan δ=0.2%) and high dc resistivity (ρ=5.5x106 Ω cm at 500 °C), indicating its potential for high temperature piezoelectric sensing applications.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.ceramint.2016.01.112