Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7994225 | Journal of Alloys and Compounds | 2018 | 6 Pages |
Abstract
Multifunctional ceramics with good dielectric, ferroelectric, piezoelectric and photoluminescence properties have been fabricated at a low sintering temperature of 960 °C. Via the addition of Li2CO3, oxygen vacancies are produced in the Pr-doped 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3 ceramics, which can enhance the ionic lattice-diffusion coefficient, promote the densification and thus lower the sintering temperature effectively from 1200 to 960 °C. The Li-addition also induces lattice distortion and expansion, which strengthen the internal field among the polar nano-regions of the ceramic. As a result, the depolarization temperature is increased and the room-temperature piezoelectric properties are enhanced. Moreover, the structural symmetry is reduced, and thus leading to an increase in the uneven components of the crystal fields around Pr3+ and then an enhancement in photoluminescence emissions. Together with the good dielectric properties assured by the dense structure, the ceramics are ready for use in multifunctional optoelectronic applications.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Tat-Hang Chung, K.W. Kwok,