Textured CaBi4Ti4O15 ceramics with large piezoelectricity, excellent thermal stability and high resistivity

The bismuth layer-structured ferroelectrics (BLSF) are promising high-temperature piezoelectric materials, in which large piezoelectricity, good thermal stability and high electrical resistivity are desired. Here highly textured CaBi4Ti4O15 BLSF ceramics with orientation factor of 82% have been fabricated by spark plasma sintering technique. The piezoelectric coefficient d(33) is significantly enhanced by 250%, from 7.2 pC/N for the texture-less sample to 25.3 pC/N for the textured one, accompanied by a high Curie temperature T-C= 788 C-o. The variation of d33 is below 5% in the temperature range of 25-500 C-o, showing excellent thermal stability. The textured sample exhibits high electrical resistivity rho = 2.1 x 10(11) Omega center dot cm, an order of magnitude larger than that of the texture-less sample. At the temperature as high as 500 C-o, the textured sample still maintains excellent electrical properties of d(33) = 24.2 pC/N, tan delta = 9.9% and. = 2.7 x 10(6) Omega center dot cm, suggesting that the textured CaBi4Ti4O15 ceramics could be a potential candidate for high-temperature piezoelectric sensor or detector applications.

Automated summary

This article reports on the fabrication of highly textured CaBi4Ti4O15 BLSF ceramics using spark plasma sintering technique. The textured samples exhibit excellent piezoelectric properties, thermal stability, and high electrical resistivity, making them potential candidates for high-temperature piezoelectric sensor or detector applications.