A kind of preparation method of nitrogen-doped bismuth ferrite nanopowder
A technology of nano-powder and bismuth ferrite, which is applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of few researches on doping substitution, and achieve the effect of avoiding ferroelectric-paraelectric phase transition
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Embodiment 1
[0029] Weigh 1.213g of bismuth nitrate pentahydrate and 1.01g of ferric nitrate nonahydrate at a molar ratio of 1:1 and dissolve them in 50ml of dilute nitric acid; 3+ The concentration is about 0.025mol / L, and then according to Fe 3+ The ions are added with tartaric acid at a molar ratio of 1:1, and finally by Fe and Fe 3+ The molar ratio of ions is 1.2:1. Add urea to the above solution; preheat the obtained solution in an oil bath at 55°C for 1 hour, then raise the temperature to 105°C and stir the reaction until it is completely evaporated to dryness to form xerogel; The gel is ground into powder, pre-fired in a muffle furnace at 300°C for 2 hours, then heated to 600°C for 1 hour, and then cooled naturally with the furnace; put the sintered powder into a dilute nitric acid solution with a concentration of 1M / L and stir to clean it 1 h, then repeatedly rinsed with deionized water and suction filtered, and finally vacuum-dried at 80° C. to obtain nitrogen-doped bismuth ferri...
Embodiment 2
[0032] Weigh 1.213g of bismuth nitrate pentahydrate and 1.01g of ferric nitrate nonahydrate at a molar ratio of 1:1 and dissolve them in 50ml of dilute nitric acid; 3+ The concentration is about 0.025mol / L, and then according to Fe 3+ The ions are added with tartaric acid at a molar ratio of 1:1, and finally by Fe and Fe 3+ The molar ratio of ions is 0.9:1, and urea is added to the above solution; the resulting solution is preheated for 1.5h under stirring in an oil bath at 60°C, and then heated to 110°C and fully stirred until the reaction is completely evaporated to dryness to form xerogel; The dry gel is ground into powder, pre-fired in a muffle furnace at 350°C for 2 hours, then heated to 650°C for 1 hour, and then cooled naturally with the furnace; put the sintered powder into a dilute nitric acid solution with a concentration of 1M / L and stir Wash for 1 hour, then repeatedly rinse with deionized water and suction filter, and finally vacuum dry at 90° C. to obtain nitrog...
Embodiment 3
[0035] Weigh 1.213g of bismuth nitrate pentahydrate and 1.01g of ferric nitrate nonahydrate at a molar ratio of 1:1 and dissolve them in 50ml of dilute nitric acid; 3+ The concentration is about 0.025mol / L, and then according to Fe 3+ The ions are added with tartaric acid at a molar ratio of 1:1, and finally by Fe and Fe 3+ Add urea to the above solution at a molar ratio of ions of 0.5:1; preheat the resulting solution in an oil bath at 65°C for 2 hours, then raise the temperature to 110°C and stir the reaction until it is completely evaporated to dryness to form a xerogel; The gel is ground into powder, pre-fired in a muffle furnace at 400°C for 2 hours, then heated to 750°C for 2 hours, and then cooled naturally with the furnace; put the sintered powder into a dilute nitric acid solution with a concentration of 1M / L and stir to clean it 1.5h, then repeatedly washed with deionized water and suction filtered, and finally vacuum-dried at 110°C to obtain nitrogen-doped bismuth ...
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