Abstract
Bismuth layer structural ceramics with a composition of CaBi4Ti3.95Nb0.05O15+0.2wt% 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=27pC/N). In addition, this ceramic also possesses high Curie temperature (Tc=790°C), low dielectric loss (tanδ=0.2%) and high dc resistivity (ρ=5.5×106Ωcm at 500°C), indicating its potential for high temperature piezoelectric sensing applications.
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