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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/18947

Title: BiFeO3 thin films via aqueous solution deposition: a study of phase formation and stabilization
Authors: PAVLOVIC, Nikolina
Modarresi, Hiwa
RISKIN, Alexander
DE DOBBELAERE, Christopher
Van Bael, Margriet J.
Temst, Kristiaan
VAN BAEL, Marlies
Issue Date: 2015
Publisher: SPRINGER
Citation: JOURNAL OF MATERIALS SCIENCE, 50 (13), p. 4463-4476
Abstract: This paper reports a thorough microstructural investigation of bismuth ferrite (BFO) thin films subjected to various processing conditions and discusses their influence on the stability of the BiFeO3 perovskite phase. The formation of secondary phases in BFO thin films is studied as a function of annealing temperature and time, film thickness, Bi excess, and Ti substitution. While films annealed at 600 A degrees C consist of the desired BiFeO3 phase, higher temperatures induce the decomposition leading to a significant amount of secondary phases, particularly the iron-rich Bi2Fe4O9 phase. A longer annealing time at 700 A degrees C further enhances the decomposition of BiFeO3. Qualitative microstructural analysis of the films is performed by electron backscattered diffraction which provides phase analysis of individual grains. The morphology of the single-crystalline Bi2Fe4O9 grains that are embedded in the BiFeO3 matrix drastically changes as a function of the film thickness. Nucleation of these Bi2Fe4O9 grains probably occurs at the film/substrate interface, after which grain growth continues toward the surface of the film through the depletion of the BFO phase. Addition of Bi excess or the substitution of Fe with Ti in the precursor solutions significantly reduces the formation of an iron-rich secondary phase. Influence of the secondary phases as well as Ti substitution on magnetic properties of BFO films was investigated.
Notes: [Pavlovic, Nikolina; Riskin, Alexander; De Dobbelaere, Christopher; Hardy, An; Van Bael, Marlies K.] Hasselt Univ, Inst Mat Res, Inorgan & Phys Chem & IMEC Div IMOMEC, B-3500 Hasselt, Belgium. [D'Haen, Jan] Hasselt Univ, Inst Mat Res, Mat Phys, B-3590 Diepenbeek, Belgium. [Modarresi, Hiwa; Temst, Kristiaan] Katholieke Univ Leuven, Inst Kern En Stralingsfys, B-3001 Leuven, Belgium. [Van Bael, Margriet J.] Katholieke Univ Leuven, Lab Vaste Stoffys Magnetisme, B-3001 Leuven, Belgium.
URI: http://hdl.handle.net/1942/18947
DOI: 10.1007/s10853-015-8987-z
ISI #: 000354093500002
ISSN: 0022-2461
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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