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Method for preparing L10-FePt Nano-particles through water bath alternate reduction

A technology of l10-fept and nanoparticles, applied in the field of alternate reduction of water bath to prepare L10-FePt nanoparticles, can solve the problems of carbonyl iron being highly toxic and unsuitable for large-scale use, and achieve the effect of reducing the ordering temperature

Inactive Publication Date: 2012-09-26
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Thermal decomposition of carbonyl iron and reduction of platinum acetylacetonate are commonly used early methods for the preparation of FePt nanoparticles, but carbonyl iron is highly toxic and not suitable for large-scale use

Method used

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  • Method for preparing L10-FePt Nano-particles through water bath alternate reduction
  • Method for preparing L10-FePt Nano-particles through water bath alternate reduction

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0016] 1. With the sample: the H 2 PtCl 6 ·6H 2 O(n Pt mol) is soluble in water, the volume of water (liter) is related to n pt (mole) ratio is 25:1, dubbed into aqueous solution; FeCl 2 4H 2 O(n Fe mol) is soluble in water, the volume of water (liter) is related to n Fe (mole) ratio is 25:1, made into an aqueous solution, weighed CTAB n Fe +n Pt mol.

[0017] 2. Experimental steps

[0018] ①Put CTAB into a three-necked flask to make an aqueous solution. The ratio of the volume of water (liter) to the molar amount of CTAB is 25:1. Heat the three-neck flask to 70°C in a collector-type constant temperature heating magnetic stirrer, keep stirring and argon until the end of the experiment.

[0019] ② Set the molar weight as n Fe +n Pt The hydrazine hydrate was added to the three-necked flask, and then the Pt 2+ One-tenth of the solution was dripped into the three-neck flask very slowly (dropping time was 10 minutes) and evenly. After the dropwise addition was compl...

preparation example 2

[0025] 1. Sample preparation is the same as Example 1

[0026] 2. Experimental steps

[0027] ① Put CTAB(n Fe +n Pt mol) into a three-necked flask to form an aqueous solution, in which the ratio of the volume of water (liter) to the molar amount of CTAB is 25:1. Heat the three-neck flask to 70°C in a collector-type constant temperature heating magnetic stirrer, keep stirring and pass argon protection gas until the end of the experiment.

[0028] ② put n Fe +n Pt Moles of hydrazine hydrate were added to the three-necked flask, and then the Fe 2+ One-tenth of the solution was dripped into the three-necked flask very slowly (dropping time was 10 minutes) and evenly, and reacted for 30 minutes.

[0029] ③Inject Pt with an infusion set needle 2+ One-tenth of the solution was slowly and evenly dropped into the three-necked flask (dropping time was 10 minutes), and reacted for 30 minutes.

[0030] ④ Repeat steps ② and ③ 10 times, adding FeCl alternately 2 4H 2 O solution a...

preparation example 3

[0033] 1. Sample preparation is the same as Example 1

[0034] 2. Experimental steps

[0035]

x1

x2

x3

x4

x5

x6

x7

x8

x9

x10

Fe 2+

0.025V

0.042V

0.058V

0.072V

0.092V

0.108V

0.125V

0.142V

0.158V

0.175V

Pt 2+

0.025V

0.042V

0.058V

0.072V

0.092V

0.108V

0.125V

0.142V

0158V

0.175V

[0036] ① Put CTAB(n Fe +n Pt mol) into a three-necked flask to form an aqueous solution, wherein the ratio of the volume of water (liter) to the molar amount of CTAB is 25:1. Heat the three-neck flask to 70°C in a collector-type constant temperature heating magnetic stirrer, keep stirring and pass argon protection gas until the end of the experiment.

[0037] ② put n Fe +n Pt Mole of hydrazine hydrate was added to the three-necked flask, and then x1 ml FeCl 2 4H 2 O solution is dropped ...

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Abstract

The invention relates to a method for preparing L10-FePt Nano-particles through water bath alternate reduction, and the method comprises the following steps of: controlling degree of order of Fe elements and Pt elements in particles; modulating chemical degree of order of the Nano-particles, thereby reducing phase transformation temperature of the Nano-particles; the phase transformation temperature of the L10-FePt Nano-particles is reduced, so that the L10-FePt Nano-particles are of important significance in application of ultrahigh density information storage field. In the method, FePt Nano-particles can be prepared at a lower temperature through a simple operation craft and a low-cost experiment method. The FePt Nano-particles prepared by the method disclosed by the invention is of a certain chemical order, therefore, ordering temperature of the L10-FePt Nano-particles can be effectively reduced, and the method disclosed by the invention belongs to a development field for ultrahigh density perpendicular magnetic recording materials...

Description

technical field [0001] The present invention relates to a kind of water bath alternating reduction preparation L1 0 - A method of preparing FePt nanoparticles involving a chemically ordered L1 0 - Chemistry of FePt nanoparticles. Background technique [0002] L1 0 -FePt nanoparticles have high magnetocrystalline anisotropy (K=6.6×10 6 ~10×10 6 jm -3 ), high coercive force, high magnetic energy product, high Curie temperature (Tc=480°C) and very low superparamagnetic critical size (D=2.8-3.3nm), and good chemical stability, is The most promising ultra-high-density magnetic storage material for the next generation. Compared to physical deposition methods, chemically synthesized, self-assembled L1 0 -FePt nanostructure has the advantages of easy-to-obtain raw materials, simple equipment, mild preparation conditions, easy large-scale industrial production, narrow particle size distribution, and controllable size and shape. It has great application prospects in the field o...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 白晓军曹崇德张媛媛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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