Low-temperature-sintered Pr-doped 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO3multifunctional ceramics with Li2CO3sintering aid

Tat Hang Chung, Kin Wing Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)

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)TiO3-0.07BaTiO3ceramics, 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.
Original languageEnglish
Pages (from-to)317-322
Number of pages6
JournalJournal of Alloys and Compounds
Volume737
DOIs
Publication statusPublished - 15 Mar 2018

Keywords

  • Ferroelectrics
  • Photoluminescence
  • Piezoelectric properties
  • Pr-doped BNTBT
  • Sintering aid

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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