Method for preparing barium ferrite at low temperature
A barium ferrite, low-temperature technology, applied in the field of preparation of magnetic material technology, can solve the problems of long dehydration and heat treatment time, difficult quenching process, complicated washing process, etc., to reduce hard agglomeration of products, improve synthesis efficiency, The effect of simple process
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Embodiment 1
[0018] by FeCl 2 : FeCl 3 The molar ratio is 2:8, the Ba:Fe molar ratio is 1:10.5 and weighs 6.000×10 -3 mol FeCl 2 4H 2 O, 2.400×10 -2 mol FeCl 3 ·6H 2 O, 2.857×10 -3 mol BaCl 2 2H 2 O, 6.571×10 -4 mol KNO 3 Put it into a 50ml small beaker, add 12ml of distilled water and stir with a magnetic stirrer to dissolve. Add 0.1914mol NaOH to another 50ml small beaker, dissolve it with 8ml water, then add it to the stirring mixed solution, stir evenly, pour it into a 40ml reaction kettle, wash the beaker and add it to the reaction kettle to make its liquid volume 30ml , tighten it, put it in an oven and heat it to 250°C for 2 hours, then cool it with the furnace, filter it, and wash it with deionized water until there is no Cl - , dried in an oven at 80°C to obtain hexagonal flaky single-phase BaFe 12 o 19 , Ms=39.4A·m 2 kg -1 , Hc=107kA·m -1 . BaFe 12 o 19 The samples were characterized by XRD and SEM, figure 1 , figure 2 To characterize the result.
Embodiment 2
[0019] Embodiment 2: by FeCl 2 : FeCl 3 The molar ratio is 2:8, the Ba:Fe molar ratio is 1:10.5 and weighs 6.000×10 -3 mol FeCl 2 4H 2 O, 2.400×10 -2mol FeCl 3 ·6H 2 O, 2.857×10 -3 molBaCl 2 2H 2 O, 6.571×10 -4 mol KNO 3 Put it into a 50ml small beaker, add 12ml of distilled water and stir with a magnetic stirrer to dissolve. Add 0.1914mol NaOH to another 50ml small beaker, dissolve it with 8ml water, then add it to the stirring mixed solution, stir evenly, pour it into a 40ml reaction kettle, wash the beaker and add it to the reaction kettle to make its liquid volume 30ml , Tighten it, put it in an oven and heat it to 200°C for 4 hours, then cool it with the furnace, filter, wash with deionized water until there is no Cl - , dried in an oven at 80°C to obtain hexagonal flaky single-phase BaFe 12 o 19 , but the crystal form is not complete, Ms=24.47A·m 2 kg -1 , Hc=111kA·m -1 .
Embodiment 3
[0020] Embodiment 3: Preparation of aluminum-doped barium ferrite
[0021] All iron elements in the raw material of iron elements are replaced by ferrous chloride, and the molar ratio of Ba:(Fe+Al) is 1:9.5 and weighs 2.825×10 -2 mol FeCl 2 4H 2 O, 1.750×10 -3 mol Al(NO 3 ) 3 9H 2 O, 3.158×10 -3 mol BaCl 2 2H 2 O, 6.632×10 -4 mol KNO 3 Put it into a 50ml small beaker, add 12ml distilled water and stir with a magnetic stirrer, wherein Ba 2+ / (Fe 2+ +Al 3+ ) ratio of 1:9.5, dissolved. Add 0.1926mol NaOH to another 50ml small beaker, dissolve it with 8ml water, then add it to the stirring mixed solution, stir evenly, pour it into a 40ml reaction kettle, wash the beaker and add it to the reaction kettle to make its liquid volume 30ml , Tighten it, put it in an oven and heat it to 250°C for 4 hours, then cool it with the furnace, filter, wash with deionized water until there is no Cl - , dried in an oven at 80°C to obtain hexagonal flaky single-phase BaFe 11.3 al 0...
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