TH13632C3 - Synthesis process of ammonium heptamolybdate vanadium dioxide powder by 2-step sintering method. - Google Patents

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Disclaimer (all) which will not appear on the advertisement page. : ------ 07/09/2017 ------ (OCR) Page 1 of 1 page Disclaimer 1. Synthesis process of ammonium heptamolybdate vanadium dioxide powder. 2-step sintering method has the following steps A. Mix ammonium, metavanedate and distilled water in proportion. 1: 100 by weight, heated in the temperature range 60-80 degrees Celsius, stirring continuously at a speed in the range of 600 - 800 rpm for 10-30 minutes to dissolve the ammonium metavanedate. Homogeneous in water b. Add 1.36 - 1.50% ammonium heptamolybdate dopant by weight. Stirring continuously at speeds in the range of 600- 800 rpm until they melt together. C. Add 0.50 - 1.50 percent oxalic acid dihydrate by weight to the resulting ammonium metavanadate solution. Stirring continuously at speeds in the range of 600 - 800 rpm for 30 - 60 minutes until a blue vanadium oxalate solution is obtained. D. Vanadium oxalate solution is dried in a microwave for 180 - 900 watts for 30 - 60 minutes. E. Grind the powder from baking with a grinder. F. The resulting powder is burned at a temperature range of 400 - 700 degrees Celsius in the atmosphere. Nitrogen was given an increase of 5 - 10 ° C per minute for 1 hour when the powder cooled to room temperature. The resulting powder is to be incinerated again at the same temperature in the atmosphere. Nitrogen at an increase of 5 - 10 ° C / min for 1 h, a powder of vanadium dioxide doped ammonium heptamolybdate with a stable monoclinic crystal structure was obtained. And had thermochromic properties with a transition temperature of about 43 degrees Celsius. ------------ Correction 17/11/2016 1. Process for synthesis of vanadium dioxide powder. Ammonium heptamolybdate is doped by a 2-step sintering method. A. Mix ammonium metavanedate and distilled water in a proportion of 1: 100 by weight, heated in the temperature range 60-80 ° C, stirred continuously at a speed in the range of 600 - 800 rpm for 10. -30 minutes will be dissolved ammonium metavanedate in water. B. Add 1.36 - 1.50% ammonium heptamolybdate dopant by weight. Stirring continuously at speeds in the range of 600 - 800 rpm until they melt together. C. Add 0.50 - 1.50 percent oxalic acid dihydrate by weight to the resulting ammonium metavanadate solution. Stirring continuously at speeds in the range of 600 - 800 rpm for 30 - 60 minutes until a blue vanadium oxalate solution is obtained. D. Vanadium oxalate solution is dried in a microwave for 180 - 900 watts for 30 - 60 minutes. E. Grind the powder from baking with a grinder. F. The resulting powder is incinerated at a temperature range of 400 -700 degrees Celsius in the atmosphere. Nitrogen was given an increase of 5 - 10 ° C per minute for 1 hour when the powder cooled to room temperature. The resulting powder is to be incinerated again at the same temperature in the atmosphere. Nitrogen at an increase of 5 - 10 ° C / min for 1 h, a powder of vanadium dioxide doped ammonium heptamolybdate with a stable monoclinic crystal structure was obtained. And had thermochromic properties with a transition temperature of about 43 degrees Celsius --------------------- 1. Synthesis process of vanadium dioxide powder with additive. With a 2-step method of burning, the steps are as follows A. Mix ammonium metavanadate and water in proportion. 1: 100 by weight given Heat in the temperature range 60-80 degrees Celsius, stirring speed in the range of 600-800 rpm for 10-30 minutes until the ammonium metavanedate is homogeneous in water. B. Add ammonium. Heptamolybdate 1.36-1.50 percent by weight, stirring continuously at a speed in the range of 600-800 stitches per minute until dissolved together. C. Add 0.50-1.50 percent oxalic acid dihydrate. By weight The solution will be yellow-orange. Continue stirring at a speed in the range of 600 - 800 rpm for at least 30-60 minutes. The solution will turn blue. D. The resulting solution is dried in a microwave for 180-900 watts for 30-60 minutes. E. Grind the powder obtained by baking with a grinder. F. The resulting powder is incinerated in the atmosphere temperature range 400-700 ° C. Nitrogen was given an increase of 5-10 ° C per minute for 1 hour when the powder cooled to room temperature. The resulting powder is to be burned again at the same temperature in the nitrogen atmosphere. By increasing the temperature of 5-10 degrees Celsius per minute for 1 hour, vanadium powder was obtained. Doped molybdenum which has a stable crystal structure