The beta to gamma (insulator-metal) transition in BiFeO3

Abstract

High temperature powder neutron diffraction experiments have been conducted around the reported beta-gamma, insulator-metal phase transition (~ 930 C) in BiFeO3. The results demonstrate that while a small volume contraction is observed at the transition temperature, consistent with an insulator-metal transition, both the beta and gamma phase of BiFeO3 exhibit orthorhombic symmetry i.e. no further increase of symmetry occurs under the present experimental conditions, contrary to previous suggestions. Furthermore we observe the gamma orthorhombic phase to persist up to a temperature of approximately 950 C before complete decomposition into Bi2Fe4O9 (and liquid Bi2O3), which subsequently begins to decompose at approximately 960 C.

References in corpus (3)

• The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition
• The ferroelectric-paraelectric phase transition in BiFeO3: crystal structure of the orthorhombic beta-phase
• Phonon Spectroscopy Near Phase Transition Temperatures in Multferroic BiFeO3 Epitaxial Thin Films

Cited by in corpus (16)

• First-principles predictions of low-energy phases of multiferroic BiFeO3
• Multiple high-pressure phase transitions in BiFeO3
• Domain walls in a perovskite oxide with two primary structural order parameters: first-principles study of BiFeO${}_3$
• Surface phase transitions in BiFeO3 below room temperature
• The effects of intrinsic local distortions vs. dynamic thermal motions on the stability and band gaps of cubic oxide and halide perovskites
• Multiferroic coupling in nanoscale BiFeO3
• Theoretical approach to ferroelectricity in hafnia and related materials
• Rotomagnetic coupling in fine grained multiferroic BiFeO3: Theory and experiment
• Phase Transitions and Antiferroelectrivity in BiFeO3 from Atomic Level Simulations
• Bismuth-based perovskites as multiferroics
• On the link between Octahedral Rotations and Conductivity in the Domain Walls of BiFeO3
• Tunable Band gap of Iron-Doped Lanthanum-Modified Bismuth Titanate Synthesized by the Thermal Decomposition of a Secondary Phase
• High-Temperature Phonon Spectra of Multiferroic BiFeO3 from Inelastic Neutron Spectroscopy
• Melting of Spatially Modulated Phases in La-doped BiFeO3 at Surfaces and Surface-Domain Wall Junctions
• Chiral properties of bismuth ferrite (BiFeO3) inferred from resonant x-ray Bragg diffraction
• Intrinsic structural instabilities of domain walls driven by gradient couplings: meandering anferrodistortive-ferroelectric domain walls in BiFeO3