Preparation method of niobium-soluble lithium titanate solid-solution medium ceramic powder
A technology of dielectric ceramics and solid solutions, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problems of low sintering activity, low powder purity, coarse particles, etc., to achieve industrial production, process stability, good reproducibility
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[0030] Example 1:
[0031] LiNO 3 , Nb 2 O 5 And Ti(C 4 H 9 O) 4 For raw materials. LiNO 3 , Ti(C 4 H 9 O) 4 And Nb 2 O 5 According to the expression Li 2.06 Nb 0.18 Ti 0.76 O 3 The stoichiometric ratio is formulated. First, the raw material LiNO 3 , Ti(C 4 H 9 O) 4 Weigh the raw materials according to the Li:Ti molar ratio of 2.06:0.76; then weigh the LiNO 3 And Ti(C 4 H 9 O) 4 Add citric acid solution (mass concentration of 50%), the molar ratio of citric acid to metal ions is 3:1, and heat to about 40℃, after stirring for 30 minutes to dissolve, add ammonia water to adjust the pH value and adjust the pH of the solution The value is 5. Then add ethylene glycol to the solution, the molar ratio of ethylene glycol to citric acid is 3:1, while adding sodium polyacrylate, the molar ratio of sodium polyacrylate to ethylene glycol is 0.5:1, while heating the solution to 90°C , And keep stirring for 6h, then a black wet gel can be prepared. Dry the obtained wet gel in an oven a...
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[0032] Example 2:
[0033] LiNO 3 , Nb 2 O 5 And Ti(C 4 H 9 O) 4 For raw materials. LiNO 3 , Ti(C 4 H 9 O) 4 And Nb 2 O 5 According to the expression Li 2.08 Nb 0.24 Ti 0.68 O 3 The stoichiometric ratio is formulated. First, the raw material LiNO 3 , Ti(C 4 H 9 O) 4 Weigh the raw materials according to the Li:Ti molar ratio of 2.08:0.68; then the weighed LiNO 3 And Ti(C 4 H 9 O) 4 Add citric acid solution (mass concentration of 50%), the molar ratio of citric acid to metal ions is 3:1, and heat to about 40℃, after stirring for 30 minutes to dissolve, add ammonia water to adjust the pH value and adjust the pH of the solution The value is 5.5. Then add ethylene glycol (the molar ratio of ethylene glycol to citric acid is 3:1), and add sodium polyacrylate (the molar ratio of sodium polyacrylate to ethylene glycol is 1:1), and heat the solution to 90℃, and keep stirring for 8h, can prepare black wet gel. Dry the obtained wet gel in an oven at 120°C for 36 hours to obtain a black ...
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[0034] Example 3:
[0035] LiNO 3 , Nb 2 O 5 And Ti(C 4 H 9 O) 4 For raw materials. LiNO 3 , Ti(C 4 H 9 O) 4 And Nb 2 O 5 According to the expression Li 2.01 Nb 0.03 Ti 0.96 O 3 The stoichiometric ratio is formulated. First, the raw material LiNO 3 , Ti(C 4 H 9 O) 4 Weigh the raw materials according to the Li:Ti molar ratio of 2.01:0.96; then weigh the LiNO 3 And Ti(C 4 H 9 O) 4 Add citric acid solution (mass concentration of 50%), the molar ratio of citric acid to metal ions is 4:1, and heat to about 40°C. After stirring for 30 minutes to dissolve, add ammonia to adjust the pH value and adjust the pH of the solution The value is 4.5. Then add ethylene glycol (the molar ratio of ethylene glycol to citric acid is 2:1) and add sodium polyacrylate (the molar ratio of sodium polyacrylate to ethylene glycol is 0.5:1), and heat the solution to After stirring for 8 hours at 90°C, a black wet gel can be prepared. Dry the obtained wet gel in an oven at 120°C for 72 hours to obtain a b...
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