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Preparation of Nanocrystalline Lithium Niobate Powders at Low Temperature by Ting Ting Su; Heng Jiang; Hong Gong; Yu Chun Zhai is a Materials Science article available to read on EtoBox.

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A facile route to prepare lithium niobate (LiNbO 3 ) powders was proposed by an alternative solid-state method. Stoichiometric Li 2 C 2 O 4 and ammonium niobium oxalate were mixed with small amounts of water and then dried at room temperature. It was demonstrated that Li[NbO(C 2 O 4 ) 2 ]•nH 2 O intermediate was produced by an ion-exchange reaction. Pure LiNbO 3 powders were successfully synthesized by heating the intermediate at 500, 600 and 700 °C for 3 h. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, UV-Vis diffuse reflectance (UV-Vis) spectroscopy and thermogravimetric (TG) analysis were used to characterize the precursor compound and as-prepared samples. XRD results reveal that all the products are identified as hexagonal structure with high relative crystallinity (>87%). The particle size is found to be about 40 nm for the mixture calcined at 500 °C according to XRD data, which is in good agreement with SEM data. The as-prepared LiNbO 3 powders by this method are high quality according to FTIR spectra. (Li 0.996 Nb 0.005 )Nb 0.999 O 3 phase was formed when the calcination temperature was raised to 800 °C.

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Author

Ting Ting Su; Heng Jiang; Hong Gong; Yu Chun Zhai

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Wiley (ISSN 0232-1300)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)