Structural phase transitions and dielectric anomaly in YFe 2O4-δ

Y. Horibe, K. Kishimoto, S. Mori, N. Ikeda

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We examined structural changes related to charge ordering (CO) in the temperature window between 100 K and room temperature (RT) in YFe 2O4-δ by transmission electron microscopy. Characteristic diffuse scattering elongated along the [001] direction through the (1/3 1/3 0)-type reciprocal positions was found at RT, which is related to the microdomains due to the CO with a size of 10 - 20 nm. In addition, it was also found that the superlattice structures characterized by the (1/3 - n1/3 + n 0)-type modulation vector, which should be due to the vacancy ordering, coexist with the microdomains due to the CO. On the other hand, in stoichimetric YFe2O4, we found temperature variations of the superlattice structures on warming from 100 K, which should be strongly related to the dielectric anomalies in YFe2O4.

Original languageEnglish
Pages (from-to)192-194
Number of pages3
JournalJournal of the Korean Physical Society
Volume46
Issue number1
Publication statusPublished - Jan 1 2005
Externally publishedYes

Keywords

  • Charge ordering
  • Ferroelectric materials
  • Mixed-valent oxides
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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