Local Structure Investigation in Multiferroic BiFeO3-BaTiO3 Ceramics by XAS Technique and Their Relevant Properties

Sujitra Unruan, Muangjai Unruan, Teerawat Monnor, Shashank Priya, Rattikorn Yimnirun

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The (1-x)BiFeO3-xBaTiO3 (with x = 0.1, 0.2, 0.3, and 0.4) ceramics were fabricated successfully by solid-state reaction method. Single-phase perovskite was obtained in all ceramics, as confirmed by XRD technique. It was observed that 0.7BiFeO3-0.3BaTiO3 was the morphotropic phase boundary (MPB) between rhombohedral and cubic phases, as also revealed from ferroelectric and magnetic properties. The simulated and experimental X-Ray Absorption Spectroscopy (XAS) study revealed that BT in 0.75BF-0.25BT is possibly taken a rhombohedral structure. Furthermore, the rounded ferroelectric hysteresis loops observed for 0.9BiFeO3-0.1BaTiO3 and 0.8BiFeO3-0.2BaTiO3 compositions could be attributed to their microstructure and surface charge effects and electron transfer between Fe3+ and Fe2+ ions. It was also found that high dielectric constant of 0.9BiFeO3-0.1BaTiO3 composition was a result of grain and grain-boundary effects, as observed in SEM micrographs. In addition, a strong signature of dielectric relaxation behavior was observed in this ceramic system with the activation energy 0.467 eV obtained from the Arrhenius' law. Finally, the local structure investigation with XAS technique provided additional information to better understand the electric and magnetic properties in the BF-BT ceramic system.

Original languageEnglish (US)
Pages (from-to)3291-3298
Number of pages8
JournalJournal of the American Ceramic Society
Volume98
Issue number10
DOIs
StatePublished - Oct 1 2015

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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