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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
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 Code: | C01B19/00; 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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