The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition

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dc.creatorPalai, R.
dc.creatorKatiyar, R. S.
dc.creatorSchmid, H.
dc.creatorTissot, P.
dc.creatorClark, S. J.
dc.creatorRobertson, J.
dc.creatorRedfern, S. A. T.
dc.creatorScott, J. F.
dc.date2007-05-20
dc.date2007-07-13
dc.date.accessioned2026-07-07T08:57:22Z
dc.date.available2026-07-07T08:57:22Z
dc.descriptionWe 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.
dc.description5 Pages, 5 grphs
dc.identifierhttps://arxiv.org/abs/0705.2883
dc.identifierhttp://arxiv.org/abs/0705.2883
dc.identifierPhysical Review B, 77, 014110 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.014110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/146942
dc.subjectMaterials Science
dc.subjectOther Condensed Matter
dc.titleThe beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition
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