Low-temperature synthesis of K2NbO3F powders by an alternative approach of solid-state reaction |
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Authors: | Tingting Su Hong Gong |
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Institution: | School of Chemistry and Materials Science, Liaoning Shihua University, No. 1 Dandonglu, Wanghua District, Fushun 113001, PR China |
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Abstract: | K2NbO3F powders were directly synthesized by an alternative solid-state method at low temperature. Stoichiometric ammonium niobium oxalate, K2C2O4 and KF were mixed with small amounts of water and then dried at room temperature. X-ray diffraction results show that layered perovskite K2NbO3F powders can be obtained by calcining the mixture in temperature range from 550 to 700 °C for 3 h. The elemental composition, powder morphology and particle size of calcination products were analyzed by scanning electron microscope-energy dispersive spectroscopy (SEM/EDS). The SEM images suggest that the particles of the powders obtained at 550 °C are irregular platelets with a diameter of 0.5-1 μm and a thickness of 100-200 nm. The platelets are 3-5 μm in diameter and 1-2 μm in thickness when the calcination temperature reaches 700 °C. K2NbO3F decomposes to K5(NbO3)4F and KF when the temperature reaches 800 °C. |
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Keywords: | K2NbO3F Alternative solid-state method Ammonium niobium oxalate |
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