Determinating Tungsten Oxides Physical Characterization

The physical characterization of surface area, micropore volume, micropore size distribution , mesopore volume, average po re diameter and fractal dimensions of four tungsten oxides of AT B (ammonium tungsten bronze ,(NH4)0 .5W O3), HTB(hydrogen tungsten bronze, H0 .33WO3), TVO (violet tungsten oxide, W18O49)and TBO (tungsten blue oxide , W O3+WO2 .9)were evaluated from analysis of nitrogen adsorption-desorption isotherm data. The results suggested that in this study T VO with the largest mesopore volume , the smallest micropore volume , the narrowest micropo re size distribution , the lowest fractal dimension value and the biggest average pore diameter was adv antageous for hydrogen reduction during fine tungsten powder production process and disadvantageous for doping process; HTB with the largest micropore volume, the widest micropore size distribution, the highest fractal dimension value and the smallest average po re diameter w as favorable for doping process , and characterization properties o f ATB and TBO in this investigation were just between TVO′s and HTB′s. Results showed that it was a preferable method to investigate the physical characterization of oxides by using adsorption desorption isotherms in this study and the physical characterization of tungsten oxides should be taken into account before they w ere used in reduction or doping process.

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