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Brankovic, Goran
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article
Spark plasma sintering of hydrothermally synthesized bismuth ferrite
Abstract
<jats:p>Bismuth ferrite, BiFeO3 (BFO), powder was synthesized by hydrothermal methodfrom Bi(NO3)3?5H2O and Fe(NO3)3?9H2O as precursors. The synthesized powderwas further sintered using spark plasma sintering (SPS). The sinteringconditions were optimized in order to achieve high density, minimal amount ofsecondary phases and improved ferroelectric andmagnetic properties. Theoptimal structure and properties were achieved after spark plasma sinteringat 630?C for 20min, under uniaxial pressure of 90MPa. The composition,microstructure, ferroelectric and magnetic properties of the SPS samples werecharacterized and compared to those of conventionally sintered ceramicsobtained from the same powder. Although the samples sintered usingconventional method showed slightly lower amount of secondary phases, thespark plasma sintered samples exhibited favourable microstructure and betterferroelectric properties.</jats:p>