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Novel synthetic method for lanthanum-manganese doped strontium ferrite magnetic powder

A magnetic powder, strontium ferrite technology, applied in the field of co-precipitation method, can solve the problems of impurity separation, product uniformity is not as good as co-precipitation, etc., and achieve the effect of improving product purity, expanding application and improving magnetic properties

Active Publication Date: 2014-02-26
盐城东方汽车广场投资发展有限公司
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  • Application Information

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Problems solved by technology

[0007] Although the above methods can prepare rare earth-doped nano-strontium ferrite, they are not as good as the co-precipitation method in terms of impurity separation and product uniformity.

Method used

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  • Novel synthetic method for lanthanum-manganese doped strontium ferrite magnetic powder
  • Novel synthetic method for lanthanum-manganese doped strontium ferrite magnetic powder
  • Novel synthetic method for lanthanum-manganese doped strontium ferrite magnetic powder

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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 Figure 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 do...

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 on a heating stirrer at 50°C for 1h, 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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Abstract

The invention relates to a formula and a synthetic method for lanthanum-manganese doped strontium ferrite magnetic powder with an adjustable magnetic coercive force, belonging to the technical fields of chemical coprecipitation preparation and preparation of magnetic materials. The method comprises the following steps dissolving soluble salt compounds (e.g., chlorate, nitrate, sulfate and acetate) of iron, strontium, manganese and lanthanum in deionized water according to a certain mol ratio and carrying out magnetic stirring; then adding a triethylamine solution and carrying out stirring while pouring until no precipitated is precipitated; allowing the precipitate to be filtered, putting the precipitate into a baking oven and removing water at a temperature of 120 DEG C; and carrying out grinding again and sintering at a temperature of 900 DEG C to prepare the lanthanum-manganese doped strontium ferrite nanometer powder. According to characterization results of the powder by XRD, the strontium ferrite retains its original structure. According to SEM observation, the microstructure of the strontium ferrite is mainly rod-like and hexagonal flaky semitransparent crystals. Through changing of the doping amount of lanthanum and manganese, the coercive force of the strontium ferrite is effectively adjusted, demands of different magnetic recording materials are met, and the application range of the strontium ferrite is broadened.

Description

technical field [0001] The invention relates to a novel synthesis method of strontium ferrite magnetic powder nanostructure, especially a co-precipitation method using triethylamine as a precipitating agent, which can make the coercive force adjustable within a certain range. Background technique [0002] Permanent magnet ferrite has the advantages of wide range of raw materials, good chemical stability, low price and high coercive force, so it is still the most widely used permanent magnet material with the highest output. However, with the development of science and technology, higher requirements have been put forward for permanent ferrite. In order to obtain high-performance ferrite ultrafine powder, most of the research is considered from two aspects of synthesis method and element doping. At present, the preparation methods mainly include ceramic method, chemical co-precipitation method, hydrothermal method, sol-gel method and so on. [0003] (1) The preparation of m...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/626B82Y30/00
Inventor 尤俊华马理曲迎东邱克强任英磊李荣德邵长健
Owner 盐城东方汽车广场投资发展有限公司
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