Non-integer ratio tungsten oxides are essentially another term for non-stoichiometric tungsten oxides. Both refer to tungsten oxide compounds where the ratio of oxygen to tungsten deviates from the exact stoichiometric ratio, such as that in tungsten trioxide (WO₃). In non-integer ratio or non-stoichiometric tungsten oxides, the tungsten to oxygen atom ratio is not a strict integer ratio.
This non-integer or non-stoichiometric phenomenon is usually due to variations in preparation conditions (such as temperature, pressure, atmosphere, etc.) or interactions with the environment during subsequent processing or usage. As a result, non-integer ratio tungsten oxides exhibit a range of unique physical and chemical properties that often differ from those of stoichiometric tungsten trioxide.
Non-integer ratio tungsten oxides come in various forms, including but not limited to WO₂, WO₂.₉ (blue tungsten oxide), and W₁₈O₄₉. These compounds have broad application prospects in areas such as catalysts, electrochromic materials, gas sensors, and optical materials. Due to the variation in oxygen content, non-integer ratio tungsten oxides may show higher catalytic activity, superior electrical and optical properties, and unique color-changing characteristics.
In summary, non-integer ratio tungsten oxides are tungsten oxide compounds with special oxygen content and crystal structures, exhibiting a variety of unique physical and chemical properties.
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