Fabrication of transparent electro-optic (K0.5Na0.5)1-xLixNb1-xBixO3lead-free ceramics

Faliang Li, Kin Wing Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

62 Citations (Scopus)

Abstract

Lead-free transparent electro-optic ceramics (K0.5Na0.5)1-xLixNb1-xBixO3have been fabricated by hot-press sintering. Owing to the effective suppression of grain growth, the Li and Bi co-modified ceramics generally possess a dense and fine-grained structure. The co-modification also causes the ceramics to transform into a nearly cubic structure with minimal optical anisotropy. A diffuse phase transformation is also induced, causing the ceramics to become more relaxor-like and contain more polar nano-regions. These would reduce the light scattering by the grains, at the grain boundaries and at the domain walls, respectively, and thus making the ceramics become optically transparent. For the ceramic modified with 5mol% Li+and Bi5+, the optical transmittance reaches a high value of 60% in the near-IR region. The ceramics also exhibit a strong linear EO response, giving a large effective linear EO coefficient in the range of 120-200pm/V.
Original languageEnglish
Pages (from-to)123-130
Number of pages8
JournalJournal of the European Ceramic Society
Volume33
Issue number1
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Dielectric properties
  • Electro-optic properties
  • Hot pressing
  • Niobates
  • Optical properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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