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Cebela, Maria
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article
Comprehensive characterization of BiFeO3 powder synthesized by the hydrothermal procedure
Abstract
<jats:p>In this paper, bismuth ferrite (BFO) particles synthesized by controlledhydrothermal process, where the particles of small sizes and with high puritywere obtained. Structural analysis showed that non-annealed powder can beperfectly fitted to rhombohedral space group R3c and contains a very smallamount of secondary phase, whereas the final product (annealed at 800?C)represents single-phase perovskite powder with high crystallinity. HRTEManalysis confirmed existence of twin stacking faults, which are responsiblefor enhanced magnetic properties. EPR measurements suggested existence ofelectrons trapped by vacancies or defects. It has been proposed thatexistence of Fe3+?OV defect complex could be generated at elevatedtemperatures followed by formation of trivalent Fe ions, which intenselyprovide local 3d moments.</jats:p>