Molten salt synthesis of SrFeO3 nanocrystals

摘要

Pure perovskite compound SrFeO₃ nanocrystals were successfully synthesized in molten NaNO₃–KNO₃ eutectic with Na₂O₂ from a mixture of strontium nitrate and ferric nitrate. The effect of metal precursors, salt medium, annealing temperature (mainly 400–800°C), and oxidizing properties of the melt on the phase composition, crystallite size and morphology of the resulting metal oxides were systematically studied by simultaneous TG/DSC, X-ray diffraction (XRD), scanning electron microscopy (SEM) methods. The results showed that the formation of the SrFeO₃ phase mainly depended on the nature of the metal precursor and salt medium. It was found that metal nitrates are the suitable precursors and NaNO₃–KNO₃ eutectic with Na₂O₂ is the suitable salt medium, which results in the formation of pure SrFeO₃ nanocrystals at a much lower temperature of 400°C.