High density blue tungsten oxide is a blue powder with molecular formula of WO2.90.
X-ray Diffraction Method to Measure Phase Composition of WO2.90 in Blue Tungsten Oxide
Industrial blue tungsten oxide is a product containing full or partial blue tungsten oxide. It has become an important raw material for producing high-quality tungsten powder. Industrial blue tungsten oxide, in accordance with different production processes, may contain yellow tungsten oxide (WO3) and/or purple tungsten oxide (WO2.72), and even contain trace amounts of ammonium paratungstate (APT) and/or ammonium tungsten bronze (ATB). In the national standard "GB/T 3457-1998", the provision of WO2.90 phase composition in blue tungsten oxide should not be less than 70%.
The phase composition of WO2.90 in blue tungsten oxide can be accurately measured by X-ray diffraction (XRD) method, which is usually applied in industry at present. The diffraction peak intensity and/or diffraction peak area of WO3 and WO2.72 phases of blue tungsten oxide and the standard sample should be tested respectively, to calculate the ratio of WO2.90、WO3 and WO2.72, then calculate the content of phase.
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