The reversible phase transition and dielectric properties of BaNb2O6 polymorphs

Dong Wan Kim, Hee Bum Hong, Kug Sun Hong, Chang Kyung Kim, Deug Joong Kim

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Barium metaniobate, BaNb2O6 with polymorphic orthorhombic and hexagonal forms was prepared by solid-state reaction. Hexagonal BaNb2O6 is the low temperature phase, and can be transformed to the orthorhombic phase over a broad temperature range above 1150°C. It was observed that the hexagonal-to-orthorhombic phase transition is reversible due to the structural similarity of these two polymorphs. The difference in transition kinetics and associated mechanisms could be confirmed from the analysis of time dependence of transformed phase. We also found the dielectric properties of each phase to be significantly different. In particular, orthorhombic BaNb2O6 has good microwave dielectric properties: Q × f = 43,000 GHz, εr = 30, τf = -45ppm/°C.

Original languageEnglish
Pages (from-to)6045-6048
Number of pages4
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume41
Issue number10
Publication statusPublished - 2002 Oct 1

Keywords

  • BaNbO
  • Dielectric properties
  • Microwave
  • Phase transition
  • Reversible

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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