Pyrochlore-type tungsten oxide is a special form of tungsten oxide with unique chemical and physical properties. The following is detailed information about pyrochlore-type tungsten oxide:
Definition and basic properties of pyrochlore-type tungsten oxide
Pyrochlore-type tungsten oxide is a layered perovskite structure, and its molecular formula is often recorded as H2W2O7 or WO3·0.5H2O.
The English name is Pyrochlore-type H2W2O7, and the common Chinese names also include pyrochlore-type tungsten oxide and pyrochlore-type tungsten oxide.
Atomic structure of pyrochlore-type tungsten oxide
The atomic structure of pyrochlore-type tungsten oxide is based on the twisted WO6 octahedron as the structural unit, and the corner tops of the tungsten oxygen rigid skeleton are constructed to form a layered structure with a six-membered ring channel.
Research on pyrochlore-type tungsten oxide
In 1988, Coucou et al. in France synthesized pyrochlore-type tungsten oxide for the first time using a soft chemical method. They used (NH4)10W12O41·5H2O as a precursor, heated and refluxed in an acidic ethylene glycol solution to obtain [(NH4)2O]xW2O6, then washed in an acid solution and heated to remove water, and finally obtained pyrochlore-type tungsten oxide powder.
Synthesis method of pyrochlore-type tungsten oxide
There are many methods for synthesizing pyrochlore-type tungsten oxide, two of which are the main methods:
Using Aurivillius-type compound Bi2W2O9 as a precursor, pyrochlore-type tungsten oxide is obtained by acid treatment. This method involves mixing Bi2O3 and WO3 in a molar ratio of 1:2 and calcining at 800℃ for 48 hours, then placing the obtained Bi2W2O9 in concentrated hydrochloric acid and vigorously stirring at room temperature for 72 hours to obtain non-distorted H2W2O7 crystals.
Hydrothermal Synthesis of Pyrochlore Tungsten Oxide
After the sodium tungstate solution is acidified to a certain pH range (usually pH is greater than 3.5 to alkaline range), the hydrothermal reaction is carried out for a certain period of time to obtain pyrochlore tungsten oxide.
Application Fields of Pyrochlore Tungsten Oxide
Pyrochlore tungsten oxide has potential applications in many fields, including layered composite materials, sensing fields, and calcination to prepare tungsten oxide. However, the current research on pyrochlore tungsten oxide is not comprehensive and cannot be mass-produced, so many application fields need to be further developed.
Analysis Method of Pyrochlore Tungsten Oxide
The analysis method of pyrochlore tungsten oxide usually includes steps such as drawing a standard curve and solid phase analysis. These steps can help researchers determine the purity and composition of the sample, and further promote the research and application of pyrochlore tungsten oxide.
In summary, pyrochlore tungsten oxide is a form of tungsten oxide with unique structure and properties, and has potential applications in many fields. With the continuous deepening of research, it is believed that pyrochlore tungsten oxide will play a more important role in the future development of science and technology.
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