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An alternative approach of solid-state reaction to prepare nanocrystalline Knb[O.sub.3]
Ist Teil von
Journal of materials science, 2010-07, Vol.45 (14), p.3778
Ort / Verlag
Springer
Erscheinungsjahr
2010
Link zum Volltext
Quelle
SpringerNature Journals
Beschreibungen/Notizen
A simple preparation of KNb[O.sub.3] powders was proposed by an alternative approach of solid-state reaction. Stoichiometric niobium oxalate and potassium acetate were mixed in water and then dried. It was demonstrated that an ion-exchange reaction occurred with the formation of K[NbO[([C.sub.2][O.sub.4]).sub.2]] n[H.sub.2]O intermediate. The single-phase KNb[O.sub.3] powders were synthesized when K[NbO[([C.sub.2][O.sub.4]).sub.2]]n[H.sub.2]O intermediate was calcined between 500 and 800 °C for 3 h. KNb[O.sub.3] powders obtained at 500 °C are determined as orthorhombic structure with an average particle size of 20-50 nm by X-ray diffraction, scanning electron microscope (SEM), and transmission electron microscopy (TEM) analysis. The morphologies of KNb[O.sub.3] obtained at different temperatures were observed by SEM and TEM analysis. The average band gap energy is estimated to be 3.16 eV by UV-vis diffuse reflectance spectra.