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- W2010446541 abstract "Phase pure BiFeO 3 powders are synthesized by an entirely aqueous solution–gel route, starting from water soluble Fe(III) nitrate or citrate, and Bi(III) citrate as precursors. In order to obtain stable solutions, which transform to homogeneous gels upon drying, the pH is adjusted to 7 and a citric acid content equimolar to the metal ions is selected. The presence of nitrate strongly accelerates the thermo-oxidative decomposition step of the precursor gel around 200 °C, and the decomposition is finished at a lower temperature for the nitrate containing precursor (460 °C) than without nitrates (500 °C) in dynamic dry air. An oxidative ambient is required to fully decompose the precursor. The presented synthesis allows very low temperature (400 °C) crystallization of BiFeO 3 together with a secondary phase, as shown by high temperature XRD. This parasitic phase remains up to high temperatures, where decomposition of BiFeO 3 is observed from 750 °C onwards, and Bi 2 Fe 4 O 9 is formed. However, optimization of the furnace treatment, considering anneal temperatures and heating rates showed that phase pure BiFeO 3 can be obtained, with the heating rate being the crucial factor (5 °C/min). The chemical purity of the powders is confirmed by FTIR, and the antiferromagnetic to paramagnetic phase transition is demonstrated by DSC measurements." @default.
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- W2010446541 date "2009-11-01" @default.
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- W2010446541 title "Effects of precursor chemistry and thermal treatment conditions on obtaining phase pure bismuth ferrite from aqueous gel precursors" @default.
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- W2010446541 doi "https://doi.org/10.1016/j.jeurceramsoc.2009.05.018" @default.
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