Phase transitions and electrical characterizations of (K0.5Na0.5)2x(Sr0.6Ba0.4)5-xNb10O30(KNSBN) ceramics with 'unfilled' and 'filled' tetragonal tungsten-bronze (TTB) crystal structure

Y. B. Yao, Chee Leung Mak, B. Ploss

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)

Abstract

Alkali-doped strontium barium niobate (K0.5Na0.5)2x(Sr0.6Ba0.4)5-xNb10O30(KNSBN) ceramics has been prepared by a conventional solid-state reaction method. The alkali-dopant concentration x has been varied from 0.24 to 1.15 so that the crystal structure was transformed from 'unfilled' to 'filled' tetragonal tungsten-bronze (TTB) structure. Apart from the change in the structural properties, the effects of the alkali-dopants on the phase transition as well as ferroelectric, piezoelectric and pyroelectric properties have also been investigated. Phase transitions have been studied in the temperature range of -200°C to 350°C. The origins of these phase transitions are discussed. The addition of the alkali-dopants enhances the ferroelectric, piezoelectric and pyroelectric properties of the KNSBN ceramics. Alkali-doping also favors abnormal grain growth and thus results in a porous microstructure, which might contribute to the enhancement of the pyroelectric performance.
Original languageEnglish
Pages (from-to)4353-4361
Number of pages9
JournalJournal of the European Ceramic Society
Volume32
Issue number16
DOIs
Publication statusPublished - 1 Dec 2012

Keywords

  • Doping
  • Porosity
  • Pyroelectricity
  • Strontium barium niobate

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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