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Prepn process of nanometer spinel type ferrite powder

A nano-spinel and spinel-type technology is applied in the field of preparation of nano-spinel-type ferrite powder, and can solve the problem that the spinel-type ferrite has a complicated process and cannot obtain homogeneous ferrite. The problem of uneven structure and particle size distribution can achieve the effect of regular crystal shape, uniform size and low cost.

Inactive Publication Date: 2007-10-24
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the product powder particles obtained by using physical methods to prepare spinel ferrite in the prior art are large and have uneven particle size distribution; the preparation of spinel ferrite by chemical methods may be complex or difficult to obtain. To the defects of the homogeneous ferrite structure, thereby providing a preparation method of nano-spinel ferrite powder with nano-sized particles, uniform particle size distribution, simple and cheap process, and mass production

Method used

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  • Prepn process of nanometer spinel type ferrite powder

Examples

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Embodiment 1

[0031] Embodiment 1, preparation homogeneous nanometer CoFe 2 o 4 Ferrite powder:

[0032] 1) Dissolving 4 parts by weight of acrylic acid in 1 part by weight of deionized water, fully dissolved under magnetic stirring, to obtain solution A;

[0033] 2) Fix the molar ratio of iron (III) nitrate and acrylic acid in solution A to be 1:20, weigh cobalt (II) and iron (III) nitrate in molar ratio of 1:2, add to solution A, and A homogeneous system B is obtained under stirring;

[0034] 3) The deionized aqueous solution of ammonium persulfate that is 2wt% by weight is slowly added in the homogeneous system B that step 2) makes under the condition of magnetic stirring, obtains solution C; The added ammonium persulfate and step 1 ) in the weight ratio of acrylic acid is 0.01:1;

[0035] 4) Heat the C solution obtained in step 3) at 100°C for 1 hour to complete the polymerization of the system; then dry it at 80°C for 24 hours; grind it after cooling, then place it in a muffle furn...

Embodiment 2

[0038] Embodiment 2, preparation homogeneous nanometer MnFe 2 o 4 Ferrite powder:

[0039] 1) Dissolving 2 parts by weight of acrylic acid in 1 part by weight of deionized water, fully dissolved under magnetic stirring, to obtain solution A;

[0040] 2) Fix the molar ratio of ferric (III) chloride to acrylic acid in solution A to be 1:20, weigh manganese (II) and ferric chloride (III) in molar ratio of 1:2, add them to solution A, Obtain homogeneous system B under magnetic stirring;

[0041] 3) The deionized aqueous solution of 6wt% ammonium persulfate is slowly added to the homogeneous system B prepared in step 2) under the condition of magnetic stirring to obtain solution C; the added ammonium persulfate and step 1 ) in a weight ratio of acrylic acid of 0.05:1;

[0042] 4) Heat the C solution obtained in step 3) at 60°C for 2 hours to complete the polymerization of the system; then dry it at 75°C for 24 hours; grind it after cooling, and then place it in a muffle furnace...

Embodiment 3

[0044] Embodiment 3, preparation homogeneous nano-NiFe 2 o 4 Ferrite powder:

[0045] 1) Dissolving 1 part by weight of acrylic acid in 1 part by weight of deionized water and fully dissolving it under magnetic stirring to obtain solution A;

[0046]2) Fix the molar ratio of iron (III) sulfate and acrylic acid in solution A to be 1:20, weigh nickel (II) and iron (III) sulfate in molar ratio of 1:2, add them to solution A, and A homogeneous system B is obtained under stirring;

[0047] 3) The deionized aqueous solution of ammonium persulfate that is 8wt% is slowly added to the homogeneous system B prepared in step 2) under the condition of magnetic stirring to obtain solution C; the added ammonium persulfate and step 1 ) in the weight ratio of acrylic acid is 0.1:1;

[0048] 4) Heat the C solution obtained in step 3) at 80°C for 3 hours to complete the polymerization of the system; then dry it at 75°C for 24 hours; grind it after cooling, and then place it in a muffle furna...

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Abstract

The present invention relates to is preparation process of nanometer spinel type ferrite powder. The spinel type ferrite has the general expression of MxM'yM' (1-x-y) Fe2O4, where, M,M' and M' are bivalent Mn,Zn,Co or Ni ion; x is 0-1, y is 0-1, and x+y is not greater than 1. The preparation process of the nanometer spinel type ferrite powder includes the following steps: weighing soluble salts of M,M', M' and Fe in certain weight proportion and adding them into deionized water solution of acrylic acid; adding deionized water solution of peroxide initiator; heating at 60-100 for complete polymerization; and drying, cooling, grinding and calcining in a muffle furnace. Compared with available technology, the nanometer spinel type ferrite powder of the present invention has the advantages of high dispersivity, homogeneous size within 8-50 nm, etc.

Description

technical field [0001] The invention relates to a preparation method of nano spinel type ferrite powder. Background technique [0002] Nanoscale materials have received increasing attention because they have very unique electrical, magnetic, optical, and chemical properties compared with bulk materials. In recent years, nanomagnetic materials have been widely used in magnetic storage, superfluids, and magnetic transport of drugs. Among them, by changing the spinel ferrite MFe 2 o 4 (M is a divalent ion selected from Mn, Zn, Co, Ni and other elements) the type of divalent metal ion M can obtain spinel ferrite with different magnetic properties. [0003] The existing method of producing spinel ferrite mainly adopts ceramic sintering technology and powder metallurgy technology. However, the ferrite powder obtained by these physical methods has large particles and uneven particle size distribution, which greatly damages the final properties of the product particles. [0004...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 付绍云刘献明肖红梅黄传军潘勤彦
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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