Hydrogen Reduction of Tungsten Oxides Part Ⅱ:Reduction of WO_(2.72) and WO_2,Transformation of β-W

摘要

The hydrogen reduction of tungsten oxides WO272and WO2 were studied directly using high-temperature X-raydiffraction analysis,The pure β-W was obtained from the reduction of WO272The transformation of β-W to x-W was alsostudied in both hydrogen and nitrogen.The forming condition of β-W from WO2 was discussed.Finally.a complete schematicdiagram of reduction of tungsten oxides was given in this paper.