Piezoelectric and structural properties of bismuth sodium potassium titanate lead-free ceramics for energy harvesting

JAVIER CAMARGO; SANTIAGO OSINAGA; MARIANO FEBBO; SEBASTIÁN P. MACHADO; FERNANDO RUBIO-MARCOS; LEANDRO RAMAJO; MIRIAM CASTRO

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

SPRINGER

Lugar: Berlin; Año: 2021 vol. 32 p. 19117 - 19125

0957-4522

The development of piezoelectric ceramics with high energy conversion efficiency is of decisive importance for the requirements of the advanced energy harvesting devices toward miniaturization and integration., Lead titanate-zirconate (PZT) piezoceramics are the most widely used energy harvesting (EH) materials due to their excellent piezoelectric properties. However, the presence of more than 60% lead in the PZT composition is a serious threat to human health and the environment. Consequently, greater efforts being made to develop lead-free alternatives to PZT-based materials. Here, we propose the Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) lead-free piezoceramics as a good candidate for the replacement of toxic lead compounds for energy harvesting applications. For that, we have carried out a systematic study of the voltage generation of BNKT-based piezoceramics for (EH) purposes. Specifically, the obtained piezoelectric charge coefficients (d33=129 pC/N and d31=-12.8 pC/N ) and maximum generated output voltage (19.9 V/g) values reveal the good ferro-piezoelectric properties and potential technological applications for energy harvesting of the BNKT?based lead-free piezoceramics. Finally, we consider that the design of new lead-free piezoceramics with superior property coefficients and functionalities, such as the BNKT-based piezoceramics, should be seriously considered as candidates for the replacement of the current toxic lead-based compounds.