Method for preparing magnesium niobate microwave ceramic powder on the basis of sol-gel technique
A sol-gel technology and microwave ceramic technology are applied in the field of preparing magnesium niobate microwave ceramic powder, which can solve problems such as unfavorable microwave ceramic sintering, and achieve the effects of fine particles, good sintering characteristics and high powder purity.
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Embodiment 1
[0028] (1) Preparation of citric acid aqueous solution of niobium
[0029] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) The stoichiometric ratio of the microwave ceramic powder, respectively taking by weighing 5.326 grams of niobium pentoxide powder, 19.2 grams of citric acid, and 14.293 grams of cosolvent potassium carbonate, wherein the molar ratio of niobium pentoxide and potassium carbonate is 1: 10. Add citric acid to 500 ml of deionized water to form an aqueous solution of citric acid; mix niobium pentoxide powder and potassium carbonate powder evenly, put them in a high-alumina crucible, and calcinate at 800 degrees for 4 hours to obtain potassium niobate;
[0030] (b) dissolving the potassium niobate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all niobate precipitates are generated;
[0031] (c) Centrifuge and wash the above-mentioned niobic acid precipitate, then add the niobic acid into the citric aci...
Embodiment 2
[0042] (1) Preparation of citric acid aqueous solution of niobium
[0043] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) The stoichiometric ratio of the microwave ceramic powder, respectively taking by weighing 5.326 grams of niobium pentoxide powder, 19.2 grams of citric acid, and 14.293 grams of cosolvent potassium carbonate, wherein the molar ratio of niobium pentoxide and potassium carbonate is 1: 10. Add citric acid to 500 ml of deionized water to form an aqueous solution of citric acid; mix niobium pentoxide powder and potassium carbonate powder evenly, put them in a high-alumina crucible, and calcinate at 800 degrees for 4 hours to obtain potassium niobate;
[0044] (b) dissolving the potassium niobate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all niobate precipitates are generated;
[0045] (c) Centrifuge and wash the above-mentioned niobic acid precipitate, then add the niobic acid into the citric aci...
Embodiment 3
[0056] (1) Preparation of citric acid aqueous solution of niobium
[0057] (a) According to magnesium niobate (Mg 4 Nb 2 o 9 ) The stoichiometric ratio of the microwave ceramic powder, respectively taking by weighing 5.326 grams of niobium pentoxide powder, 19.2 grams of citric acid, and 14.293 grams of cosolvent potassium carbonate, wherein the molar ratio of niobium pentoxide and potassium carbonate is 1: 10. Add citric acid to 500 ml of deionized water to form an aqueous solution of citric acid; mix niobium pentoxide powder and potassium carbonate powder evenly, put them in a high-alumina crucible, and calcinate at 800 degrees for 4 hours to obtain potassium niobate;
[0058] (b) dissolving the potassium niobate of step (a) in 500ml deionized water, adding nitric acid, adjusting its pH value to 4, ensuring that all niobate precipitates are generated;
[0059] (c) Centrifuge and wash the above-mentioned niobic acid precipitate, then add the niobic acid into the citric aci...
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