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Direct preparation of K 0.5 Na 0.5 NbO 3 powders
Author(s) -
Jiang Heng,
Su Ting Ting,
Gong Hong,
Zhai Yu Chun
Publication year - 2011
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201000501
Subject(s) - calcination , differential scanning calorimetry , scanning electron microscope , analytical chemistry (journal) , materials science , fourier transform infrared spectroscopy , thermogravimetric analysis , diffuse reflectance infrared fourier transform , stoichiometry , particle size , powder diffraction , diffuse reflection , band gap , nuclear chemistry , chemistry , crystallography , chemical engineering , photocatalysis , optics , organic chemistry , physics , optoelectronics , engineering , composite material , thermodynamics , catalysis
K 0.5 Na 0.5 NbO 3 powders have been directly synthesized by an alternative solid–state method. Stoichimometric mixture of ammonium niobium oxalate and C 4 H 4 O 6 KNa·4H 2 O were calcined in temperature range from 500 to 800 °C for 3 h. The precursor and calcination products were characterized with respect to stoichiometry, purity, crystalline structure, particle size and powder morphology using X–ray diffraction (XRD), X‐ray fluorescence (XRF) spectrometer, scanning electron microscope (SEM), Fourier transform infrared (FTIR) spectra, thermogravimetric (TG) analysis, differential scanning calorimetry (DSC) and UV–Vis diffuse reflectance (UV–Vis) spectroscopy. XRD and XRF results reveal that stoichiometric K 0.5 Na 0.5 NbO 3 powders could be synthesized by the method. The particle size is about 68 nm for the precursor calcined at 500 °C according to XRD data, which is in good agreement with SEM data. The average band gap energy is estimated to be 3.18 eV by UV–vis diffuse reflectance spectra. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)