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Updated: May 20, 2026
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Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain
Published on: March 27, 2018
High temperature extended x-ray absorption fine structure study of multiferroic BiFeO3
V Raghavendra Reddy1, Carlo Meneghini, Deepti Kothari
1UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore-452001, India. vrreddy@csr.res.in
Summary
Local atomic structure changes in multiferroic Bismuth Ferrite (BiFeO3) near its magnetic transition reveal early structural rearrangements. These findings suggest a link between magnetic and structural changes at lower temperatures than previously thought.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid State Chemistry
Background:
- Multiferroic Bismuth Ferrite (BiFeO3) exhibits complex phase transitions.
- Understanding the interplay between magnetic and structural properties is crucial for its applications.
Purpose of the Study:
- To investigate local atomic structure modifications around Fe atoms in BiFeO3.
- To correlate these changes with the magnetic transition at the Néel temperature (T(N)).
Main Methods:
- Fe K-edge X-ray Absorption Spectroscopy (XAS) was employed.
- Measurements were conducted across the Néel temperature (643 K).
Main Results:
- Local Fe-O bond lengths shorten upon crossing T(N).
- Ligand symmetry around Fe atoms increases at T(N).
- Fe-O bond length disorder deviates from Debye behavior above T(N).
Conclusions:
- Local structural rearrangements anticipate the ferroelectric transition.
- The magnetic transition at T(N) initiates structural changes preceding the ferroelectric Curie temperature (T(C)).
