CN100567169C - A kind of ferromagnetic gamma Fe 2O 3The preparation method of powder - Google Patents
A kind of ferromagnetic gamma Fe 2O 3The preparation method of powder Download PDFInfo
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- CN100567169C CN100567169C CNB2007101868806A CN200710186880A CN100567169C CN 100567169 C CN100567169 C CN 100567169C CN B2007101868806 A CNB2007101868806 A CN B2007101868806A CN 200710186880 A CN200710186880 A CN 200710186880A CN 100567169 C CN100567169 C CN 100567169C
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- powder
- preparation
- ferromagnetic
- gamma
- ferromagnetic gamma
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Abstract
The invention discloses a kind of ferromagnetic gamma Fe
2O
3The preparation method of powder, this method directly go out γ Fe from the urea complex preparation of iron
2O
3Powder.The granularity controlled range of powder is that its saturation magnetization can reach 73emu/g from several nanometers to tens micron, with aciculiform γ Fe
2O
3Substantially consistent.With traditional γ Fe
2O
3Powder preparation method is compared, and the simple one-step synthesis of this technology does not need complicated equipment, and cost is low.
Description
Technical field
The present invention relates to a kind of Fe
2O
3The preparation method of powder refers in particular to a kind of ferromagnetic gamma Fe
2O
3The preparation method of powder.
Background technology
Ferromagnetic gamma Fe
2O
3Powder is quite extensive in the application in following field: 1, be applied to various sound carriers (magnetic storage) as tape; 2, be applied to electronics and photoelectron product (electronicsand optoelectronics); 3, be applied to biologic medical (biomedical) aspect: (a) cellular segregation (cell separation); (b) protein purification (protein purification); (c) immunoassay (immunoassays).Traditional ferromagnetic gamma Fe that is used for tape, magnetic fluid
2O
3The preparation method of powder is very complicated, and it just can obtain by following six steps:
1, contains that the hydro-oxidation sodium solution prepares Fe (OH) in the solution of ferrous ion
2Precipitation;
2, atmospheric oxidation Fe (OH)
2Precipitation makes it change into needle-like alpha-feooh or γ-FeOOH crystal;
3,300 ℃ of calcinings needle-like alpha-feooh or γ-FeOOH crystal make it change into acicular α-Fe
2O
3Crystal;
4,600 ℃ of calcining α-Fe
2O
3Crystal;
5, at nitrogen, hydrogen, 400 ℃ of calcinings (reduction) α-Fe in the mist of steam
2O
3Crystal makes it change into needle-like Fe
3O
4
6,300 ℃ of calcinings (oxidation) needle-like Fe in air
3O
4, make it change into needle-like γ Fe
2O
3
From the above-mentioned shortcoming of finding out the traditional preparation process method: 1, the needed step of technology is too complicated; 2, because from ferrous ion, institute thinks control reaction needed air-isolation (logical usually nitrogen).
Summary of the invention
The technical problem to be solved in the present invention provides a kind of ferromagnetic gamma Fe
2O
3The preparation method of powder, this method device therefor is simple, cost is low, can a step obtain γ Fe
2O
3Powder.The another one characteristics are that the urea title complex and the raw material thereof of iron is all nontoxic, all are common chemical feedstockss.
The technical problem to be solved in the present invention is realized by following scheme:
A kind of ferromagnetic gamma Fe
2O
3The preparation method of powder is characterized in that: with the urea complex [Fe (CON of iron
2H
4)
6] (NO
3)
3100 ℃～300 ℃ heating flames just obtain γ Fe in air
2O
3Powder.
Advantage of the present invention is: this method directly goes out γ Fe from the urea complex preparation of iron
2O
3Powder.The granularity controlled range of powder is that its saturation magnetization can reach 73emu/g from several nanometers to tens micron, with aciculiform γ Fe
2O
3Substantially consistent.With traditional γ Fe
2O
3Powder preparation method is compared, and this preparation method one-step synthesis is fairly simple, does not need complicated equipment, and cost is low.
Description of drawings
Fig. 1 is with [Fe (CON
2H
4)
6] (NO
3)
3200 ℃ are heated the x-ray diffraction pattern that obtained powder in 1 hour in air.Table 1 is the contrast that records spacing value (d) and JCPD standard card.Can find out, obtain data and γ Fe
2O
3Standard card basically identical, and be different from Fe
3O
4Standard card.As shown in Figure 1, table 1 is the contrast of d value and standard card
a：JCPDS?file?No.39-1346
b：JCPDS?file?No.19-629
Fig. 2 is with [Fe (CON
2H
4)
6] (NO
3)
3200 ℃ are heated the hysteresis curve (M-H curve) that obtained powder in 1 hour in air.This result shows, obtains the feature that powder has strong magnetic material.Its saturation magnetization (Ms) is 67.45emu/g, and coercivity (Hc) is 212Oe, and remanent magnetism (Mr) is 16.82emu/g.
Embodiment
One embodiment is described in detail in detail below: in the organic solvents such as ethanol with urea (CON
2H
4) and Fe
3+Soluble inorganic salt such as ferric nitrate, can obtain absinthe-green [Fe (CON by 1: 6 mixed in molar ratio
2H
4)
6] (NO
3)
3Crystal powder;
Reaction equation: Fe
3++ 6CON
2H
4+ 3NO
3 -→ [Fe (CON
2H
4)
6] (NO
3)
3.
Get 20g ferric nitrate (Fe (NO
3)
39H
2O) under the magnetic agitation condition, be dissolved in the 40mL absolute ethyl alcohol, add again 20g urea (CON
2H
4), continue to stir 3 hours, generate a large amount of light green precipitation urea iron complexes, normal pressure filters and with absolute ethanol washing for several times, naturally dries, and obtains the light green powder.Get this powder of 5g in crucible, and put in the electric furnace, the programming rate with 10 ℃/minute in air is warming up to 200 ℃, continues heating and just obtains γ Fe in 1 hour
2O
3Powder.
Claims (1)
1, a kind of ferromagnetic gamma Fe
2O
3The preparation method of powder is characterized in that: with the urea complex [Fe (CON of iron
2H
4)
6] (NO
3)
3100 ℃～300 ℃ heating flames just obtain γ Fe in air
2O
3Powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101868806A CN100567169C (en) | 2007-11-20 | 2007-11-20 | A kind of ferromagnetic gamma Fe 2O 3The preparation method of powder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101868806A CN100567169C (en) | 2007-11-20 | 2007-11-20 | A kind of ferromagnetic gamma Fe 2O 3The preparation method of powder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101172662A CN101172662A (en) | 2008-05-07 |
| CN100567169C true CN100567169C (en) | 2009-12-09 |
Family
ID=39421451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007101868806A Expired - Fee Related CN100567169C (en) | 2007-11-20 | 2007-11-20 | A kind of ferromagnetic gamma Fe 2O 3The preparation method of powder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100567169C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114606527B (en) * | 2022-04-06 | 2023-05-12 | 齐鲁工业大学 | One-dimensional defective ferric oxide nano rod visible light anode and preparation method and application thereof |
-
2007
- 2007-11-20 CN CNB2007101868806A patent/CN100567169C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101172662A (en) | 2008-05-07 |
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Granted publication date: 20091209 Termination date: 20121120 |