Pure perovskite compound SrFeO 3 nanocrystals were successfully synthesized in molten NaNO 3 KNO 3 eutectic with Na 2 O 2 from a mixture of strontium nitrate and ferric nitrate. The effect of metal precursors, salt medium, annealing temperature (mainly 400800°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 SrFeO 3 phase mainly depended on the nature of the metal precursor and salt medium. It was found that metal nitrates are the suitable precursors and NaNO 3 KNO 3 eutectic with Na 2 O 2 is the suitable salt medium, which results in the formation of pure SrFeO 3 nanocrystals at a much lower temperature of 400°C.
Synthesis of LaMO 3 (M: Fe, Co, Ni) Using Nitrate or Nitrite Molten Salts. -Nanocrystals of the title compounds are prepared from mixtures of La(NO3)3 and Fe(NO3)3, Co(NO3)2, or Ni(NO3)2 in NaNO2, NaNO3-KNO3 eutectic, or NaNO3-KNO3 eutectic with Na2O2 molten salts (450-800°C, 2 h). The samples are characterized by powder XRD and SEM. Addition of Na2O2 facilitates the reaction between La 2 O 3 and NiO or Co 3 O 4 , leading to the formation of LaNiO 3 and LaCoO 3 at a much lower temperature of 450°C. Pure hexagonal LaNiO3 nanocrystals are obtained in molten NaNO3-KNO3 eutectic with Na2O2 at 550-750°C. -(YANG*, J.; LI, R.; ZHOU, J.; LI, X.; ZHANG, Y.; LONG, Y.; LI, Y.; J. Alloys Compd. 508 (2010) 2, 301-308,
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