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IJCT Vol.12(3) [May 2005] >


Title: Some properties of sodium tungsten bronzes as a function of sodium concentration
Authors: Sayed, A M El
Mousa, S M A
Keywords: Sodium tungsten bronzes
X-ray
IR
electrical conductivity
optical reflectance
Issue Date: May-2005
Publisher: CSIR
IPC CodeC01B19/00; C21B13/00
Abstract: Sodium tungsten bronzes, NaXWO3 have been prepared having x = 0.25-0.85 at temperatures between 700 and 850 °C in argon atmosphere. X-ray diffraction and IR absorption spectra were used to characterize the structure of the products. It was found to exist in two distinct phases tetragonal and cubic. The absorption spectra between 300 and 780 nm have been obtained by diffuse reflection method, and the characterized absorption peak wave length shows a slight shift to shorter wave lengths with increasing sodium content. The electrical conductivity (s) has been measured as a function of sodium concentration and temperature from 300 to 550 °K. The results indicate metallic conduction and the conductivity was found to increase with increasing sodium concentration.
Page(s): 304-308
ISSN: 0975-0991 (Online); 0971-457X (Print)
Source:IJCT Vol.12(3) [May 2005]

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