How Prepare Pyrochlore Type Tungsten Oxide ?(一)

Soft chemical synthesis under mild conditions, i.e. synthesis of inorganic functional material, or it is sought in the solution to a low temperature starting reactants are uniformly mixed on the molecular size, a controlled chemical reaction after generation precursor or intermediate, the last generation with the specified composition, structure and morphology of the material. 1988 French Coucou, who first synthesized by soft chemistry type of pyrochlore oxide, tungsten, they (NH4) 10-W12O41 • 5H2O as precursor glycol solution is heated in an acidic reflux get [(NH4) 2O] xW2O6 , repeatedly washed in acid solution, and the resulting powder is heated to remove water at 100 ℃, which obtained pyrochlore type tungsten oxide powder. Li et al., 1996, using the same method for preparing a series of (M2O) xWO3 • zH2O (M = H +, Li +, Na +, Ag +, and NH + 4), and to test the performance of the series powder humidity.

These methods often can only get there missing pyrochlore lattice type tungsten oxide, and water molecules which content is generally less than a full H2W2O7. Soft chemical method developed in recent years are generally presented Aurivil-lius Bi2W2O9 as precursor compounds obtained tungsten oxide pyrochlore type by acid treatment. RESchaak and ManabuKu-do, who devised the method detailed preparation process: Bi2O3 and WO3 will follow after 1:2 molar ratio of mixed 48h calcined at 800 ℃, resulting Bi2W2O9 into concentrated hydrochloric acid, and then vigorously stirred at room temperature for 72h to obtain undistorted H2W2O7 crystals. After H2W2O7 the vast majority of studies are based on this approach.

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