The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition
Palai, R. · Katiyar, R. S. · Schmid, H. · Tissot, P. · Clark, S. J. · Robertson, J. · Redfern, S. A. T. · Scott, J. F.
Original · EN
We show that epitaxial (001) thin films of multiferroic bismuth ferrite BiFeO3 are monoclinic at room temperature instead of tetragonal or Rhombohedral as reported earlier. We report a orthorhombic order-disorder beta-phase between 820C and 950C contrary to the earlier report. The transition sequence monoclinic-orthorhombic phase in (001)BiFeO3 thin film (rhombohedral-orthorhombic transition in single crystal) resembles that of BaTiO3 or PbSc1/2Ta1/2O3. The transition to the cubic γ-phase causes an abrupt collapse of the bandgap toward zero (insulator-metal transition) at the orthorhombic-cubic beta-gamma transition around 950C. This transition is similar to the metal-insulator transition in Ba0.6K0.4BiO3.
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