Acidic Organic Additives Influence Pyrochlore Type Tungsten Oxide Powder?

Formulated a number of copies 0.3mol than concentrations of sodium tungstate solution of 100ml, according to different proportions join RI (OOH). Or where (OOH) n. The clear solution was then transferred to an autoclave, and heated hydrothermal reaction at 140 ℃, detected during the reaction pH of the solution. 24h after filtration, washing (washing with deionized water and ethanol each 3 to 5 times), dried (5O℃) treatment.

Which changes the whole situation, adding organic matter weak acid solution acidity than adding a solution of hydrochloric acid acidity is lower. Since the preparation of the tungsten oxide pyrochlore type process is actually consumed in expansion, increase in the acidity of the solution will help improve the nucleation rate, such that the formation of hydrothermal more grains in a relatively short period of time. And in the material conditions of a constant increase in the number of grains of system generated will lead to reducing the grain radius. From this perspective, the difference between the actual average particle size of the product categories inconsistent with the theory of judgment, may be due to hydrothermal systems PH stability of the product particle size also play a role in the impact, and the effect is more pronounced.

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