Colossal dielectric response in barium iron niobate ceramics obtained by different precursors

Shanming Ke, Haitao Huang, Huiqing Fan, H. L W Chan, Li Min Zhou

Research output: Journal article publicationJournal articleAcademic researchpeer-review

50 Citations (Scopus)

Abstract

Ba(Fe0.5Nb0.5)O3 (BFN) ceramics were synthesized by a traditional mixed oxide method (BFN-M), as well as a columbite method (BFN-C) with FeNbO4 precursor. X-ray diffraction reveals that both the ceramics and precursor have a pure monoclinic phase. BFN-C samples showed improved microstructure with less pores and smaller grain size. Dielectric properties of the BFN ceramic were characterized in a broad frequency range (0.1 Hz to 10 MHz) and a temperature range from -120 to 300 °C. A Debye-like relaxation was found in a low-frequency range, where a high-temperature dielectric anomaly was observed too. The relative low-dielectric loss suggests that columbite method should be a better choice for the synthesis of A(Fe0.5B0.5)O3 ceramics.
Original languageEnglish
Pages (from-to)1059-1062
Number of pages4
JournalCeramics International
Volume34
Issue number4
DOIs
Publication statusPublished - 1 May 2008

Keywords

  • B. Grain size
  • BFN
  • Colossal dielectric constant
  • E. Capacitors

ASJC Scopus subject areas

  • Ceramics and Composites

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