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Method for preparing one-dimensional rod-like spinelle ferrite

A technology of spinel ferrite and spinel, applied in the field of magnetic materials, can solve the problems of high cost and complicated process, and achieve the effect of low cost, simple process flow and stable process

Inactive Publication Date: 2011-04-13
SHENYANG LIGONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to the chemical co-precipitation method, the above methods can prepare nanoparticles with different shapes, especially one-dimensional rod-shaped particles, which are complicated in process and high in cost.

Method used

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  • Method for preparing one-dimensional rod-like spinelle ferrite
  • Method for preparing one-dimensional rod-like spinelle ferrite
  • Method for preparing one-dimensional rod-like spinelle ferrite

Examples

Experimental program
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Effect test

Embodiment 1

[0029]Weigh a certain amount of NiSO according to Fe / Ni=2.0 (molar ratio) 4 ·6H 2 O and γ-FeOOH, the NiSO 4 ·6H 2 O was dissolved in deionized water and moved into the reactor, then γ-FeOOH was added to NiSO 4 in the aqueous solution and stir evenly, and control the temperature in the reactor to 25°C; press Ni 2+ / CO 3 2- =1:1 (molar ratio) Weigh Na 2 CO 3 , after it is formulated into an aqueous solution, it is added dropwise into the reactor, and the pH value in the reactor is controlled to be 8-10 during the dropwise addition; after the dropwise addition, the product obtained is left to stand for 10 hours; the product after standing is washed with water to the pH of the filtrate 7.0, suction filtered, and dried at 50°C to obtain the precursor. The precursor was fired at 900 °C for 3 hours. After roasting, grind to obtain the final product.

[0030] attached figure 1 And attached figure 2 XRD and SEM images of the precursor. Both indicate that the precursor is ...

Embodiment 2

[0033] Prepare CoFe by the step of embodiment 1 2 o 4 , but with Co(NO 3 ) 2 ·6H 2 O replaces NiSO 4 ·6H 2 O, α-FeOOH is substituted for γ-FeOOH, Fe / Co=1.9 (molar ratio).

[0034] attached Figure 6 , attached Figure 7 And attached Figure 8 It is the XRD pattern, SEM pattern and hysteresis loop diagram of the final product, which show that the main product in the final product is CoFe 2 o 4 And contains a small amount of α-Fe 2 o 3 Miscellaneous phase, the particles have obvious one-dimensional rod-shaped morphology characteristics, the aspect ratio is 5-10, the particle length is 0.5-1.2μm, its Hc is 574Oe, and Ms is 35.05emu / g. Compared with Example 1, this example illustrates that different types of spinel ferrite can be prepared by the technology of the present invention; secondly, by adjusting the type of A, B or C salt, A 1-x-y B x C y Fe 2 o 4 The aspect ratio, size and static magnetic properties of the particles can be adjusted.

Embodiment 3

[0036] Prepare NiFe by the step of embodiment 1 2 o 4 , the different reaction conditions are: choose NaOH as the precipitating agent, the standing time is 18 hours, pre-calcined at 300°C for 3 hours, and then calcined at 850°C for 3 hours.

[0037] attached Figure 9 And attached Figure 10 It is the SEM figure and the hysteresis loop figure of the final product, both of which show that the final product NiFe 2 o 4 It has obvious one-dimensional rod-shaped morphology, aspect ratio is 4-8, particle length is 0.4-1.0μm, its Hc is 225Oe, and Ms is 33.8emu / g. Compared with Example 1, this example shows that by modulating the synthetic conditions, A 1-x-y B x C y Fe 2 o 4 The particle aspect ratio can be adjusted to adjust its static magnetic properties.

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Abstract

The invention discloses a one-dimensional rod-like spinelle ferrite of which the molecular formula is A1-x-y-BxCyFe2O4 ( A,B and C may be Co, Ni, Zn, Mn, Cu, Mg and Cd, x is more than or equal to 0 and less than or equal to 1, y is more than or equal to 0 and less than or equal to 1 and x+y is more than or equal to 0 and less than 1), and a preparation method thereof. The method is a chemical precipitation-local normalization method, which comprises: adding needlelike alpha-FeOOH or gamma-FeOOH into solution of slats of A,B and C, stirring uniformly, dripping precipitator solution, controlling pH value and obtaining a precursor; and roasting the precursor at a high temperature and obtaining A1-x-y-BxCyFe2O4. The invention has the characteristics that: the prepared A1-x-y-BxCyFe2O4 has an obvious one-dimensional rod-like shape characteristic; the length-to-diameter ratio of the particles of the A1-x-y-BxCyFe2O4 is more than or equal to 4, and the length of the particles reaches nanometer grade, and the particle size distribution is narrow; and different precipitators can be selected, and the particle size of the A1-x-y-BxCyFe2O4 is controlled by synthesis conditions including the roasting condition of the precursor, the types of the salts of A,B and C or the values of x and y and the like. The method makes process simple and reaction process easily controllable and is suitable for industrial production.

Description

technical field [0001] The invention relates to a class of magnetic materials and a preparation method thereof in the technical field of magnetic materials, specifically, rod-shaped A 1-x-y B x C y Fe 2 o 4 (A, B, C are: Co, Ni, Zn, Mn, Cu, Mg, Cd, 0≤x≤1, 0≤y≤1, 0≤x+y<1) spinel ferrite magnetic Powder and its preparation method. Background technique [0002] Due to its excellent magnetic properties, spinel ferrite nanomaterials are widely used in many fields such as wave-absorbing stealth, magnetic recording, biomedicine, magnetic fluid, and catalyst. Factors such as particle size, particle morphology, and chemical composition of nanoparticles have an important impact on the magnetic properties and applications of ferrite. Therefore, it is of great significance to control the synthesis of ferrite nanomaterials from particle size, morphology, and chemical composition. Chao Liu prepared MnFe with a particle size of 4-14nm by using sodium dodecylbenzenesulfonate as a s...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 曹晓晖孟锦宏董鸿飞孙杰葛如振
Owner SHENYANG LIGONG UNIV
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