Abstract
A gel was formed when a aqueous solution of Mg(NO3)2, NbF5 and citric acid in stoichiometric ratio was heated on a water bath. No precipitation was observed at acidic pH and gellation was complete with evaporation of the solvent. This gel on decomposition at 750°C produced nanocrystallites of ternary oxide, Mg4Nb2O9 (M4N2). The phase contents and lattice parameters were studied by powder X-ray diffraction (XRD) at various temperatures. Particle size and morphology were studied by transmission electron spectroscopy (TEM). For comparison, M4N2 powders were also prepared by conventional ceramic route at 900°C.
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Murugan, A.V., Gaikwad, A.B. & Ravi, V. Preparation of nanocrystalline Mg4Nb2O9 by citrate gel method. Bull Mater Sci 29, 7–9 (2006). https://doi.org/10.1007/BF02709346
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DOI: https://doi.org/10.1007/BF02709346