Synthesis method of lanthanum manganese doped strontium ferrite magnetic powder
A technology of strontium ferrite and magnetic powder, which is applied in the field of synthesis of strontium ferrite magnetic powder nanostructures, can solve the problems of impurity separation, product uniformity is not as good as co-precipitation, etc., so as to improve product purity, expand application, Improve the effect of magnetism
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Embodiment 1
[0023] FeCl 3 , La (NO 3 )·6H 2 O, SrCl 2 4H 2 O, MnCl 2 4H 2 O was dissolved in deionized water, stirred on a stirrer, then poured into the triethylamine solution, stirred while pouring, until no precipitation was precipitated, then stirred on a heating type stirrer at 70°C for 1 h, and suction filtered with a Buchner funnel. The precipitate was dried in a drying oven at 120°C, ground into powder, baked in a muffle furnace at 900°C and kept for 2 hours. figure 1 The XRD patterns of pre-fired powders with different doping amounts of rare earths after annealing at 900°C show that the crystal lattice of the sample does not change after annealing at 900°C, and a single strontium ferrite phase is formed, which shows that La 3+ , Mn 2+ The ions have been fully incorporated into the strontium ferrite lattice structure in the form of interstitials. According to the XRD pattern, the grain size of the sample calculated by Scherrer's formula is about 280nm, which is much smaller...
Embodiment 2
[0025] FeNO 3 , La (NO 3 ) 3 ·6H 2 O, SrCl 2 4H 2 O, MnCl 2 4H 2 O dissolved in triethylamine, replacing La-Mn with M-type strontium ferrite Sr 1-x Fe 12-x La x mn x o 19 (x=0~0.35) As a precursor, stir on a stirrer, then pour into triethylamine solution, stir while pouring, until no precipitation occurs, then stir for 1h on a heating stirrer at 70°C, use Brookfield The funnel was suction-filtered, and the precipitate was dried in a drying oven at 120°C, ground into powder, put into a muffle furnace for roasting at 900°C and kept for 2 hours. figure 2 It is a scanning electron micrograph of controllable composition x=0.2. SEM shows that the product has a diameter of about 200nm, a nanorod with an aspect ratio of 10:1 and a hexagonal flake powder with a diameter of 500nm. Depend on Image 6 It can be seen that the sample only contains Sr, La, Mn, Fe, O elements, which also shows that the prepared sample does not contain any impurities. From the composition of dop...
Embodiment 3
[0027] FeCl 3 、LaCl 3 ·6H 2 O, SrCl 2 4H 2 O, MnCl 2 4H 2 O was dissolved in deionized water and La-Mn was substituted for M-type strontium ferrite Sr 1-x Fe 12-x La x mn x o 19 (x=0~0.35) As a precursor, stir on a stirrer, then pour into triethylamine solution, stir while pouring, until no precipitation occurs, then stir for 1h on a heating stirrer at 50°C, use Brookfield The funnel was suction-filtered, and the precipitate was dried in a drying oven at 120°C, ground into powder, put into a muffle furnace for roasting at 900°C and kept for 2 hours. Figure 4 is the change of the specific saturation magnetization and specific residual magnetization of the sample with the doping amount x. When the doping amount x=0.15, the coercive force is higher, and other doping amounts, the coercive force drops faster, which shows that the La-Mn doping amount can effectively control the coercive force of strontium ferrite, see Figure 5 .
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