Method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as precursor

A nanoparticle and hard magnetic technology, applied in the field of preparing hard magnetic FePt nanoparticles, can solve the problems of complex preparation process of hard magnetic L10-FePt nanoparticles, irregular nanoparticle morphology, uncontrollable size, etc. Industrialized production, excellent magnetic properties, low cost of raw materials

Inactive Publication Date: 2017-03-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems of complex preparation process, high energy consumption, irregular shape of nanoparticles and uncontrollable size of hard magnetic L10-FePt nano

Method used

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  • Method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as precursor
  • Method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as precursor
  • Method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as precursor

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specific Embodiment approach 1

[0026] Specific embodiment 1: This embodiment is a method for preparing hard magnetic iron-platinum nanoparticles using inorganic salt as a precursor, which is specifically carried out in the following steps:

[0027] 1. Mixing and stirring under protective gas: Add ferrous chloride, potassium chloroplatinate and oleylamine into a three-necked flask, and blow in nitrogen under the conditions of magnetic stirring and room temperature to exhaust air for 40 minutes to obtain a mixture; The ratio of the amount of iron and potassium chloroplatinate is 1: (1 to 1.2); the ratio of the amount of potassium chloroplatinate and oleylamine is 1: (150 to 160);

[0028] 2. Heating: The mixture prepared in step 1 is heated from room temperature to 200℃ at a heating rate of 5℃ / min~10℃ / min under the conditions of magnetic stirring and nitrogen protection, and then under magnetic stirring, nitrogen protection and the temperature is 200℃. Incubate at ℃ for 4h~5h; under the conditions of magnetic stir...

specific Embodiment approach 2

[0036] Specific embodiment two: this embodiment is different from specific embodiment one in that the ratio of the amount of ferrous chloride and potassium chloroplatinate described in step one is 1:1. Others are the same as the specific implementation.

specific Embodiment approach 3

[0037] Specific embodiment three: This embodiment is different from specific embodiment one in that the ratio of the amount of potassium chloroplatinate and oleylamine mentioned in step one is 1:150. Others are the same as the first embodiment.

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Abstract

The invention discloses a method for preparing hard magnetism iron platinum (FePt) nanometer-particles by using inorganic salt as a precursor and relates to the method for preparing the hard magnetism FePt nanometer-particles. According to the method for preparing the hard magnetism FePt nanometer-particles, the present technical problems of the complex preparation process, high energy consumption, irregular morphology of the nanometer particles and uncontrollable sizes of hard magnetism L10- FePt nanometer-particles obtained by using the surface coating method to conduct high-temperature annealing or a salt bath method are resolved. The method includes the following steps that 1, mixing and stirring are conducted under the shielding gas; 2, heating is conducted; 3, cooling is conducted; and 4, washing and drying are conducted. An easy liquid phrase thermal synthesis method is adopted; oleylamine is used as a solvent, a surfactant and a reducing agent; then, high-temperature thermal reduction of ferrous chloride and potassium chloroplatinate is conducted under a nitrogen atmosphere; the hard magnetism L10- FePt nanometer-particles with excellent magnetic performance is obtained through one step of preparation; and the magnetic performance, morphology and sizes of a product are adjusted further by adjusting the heating rate and the reaction time.

Description

Technical field [0001] The invention relates to a method for preparing hard magnetic iron platinum nanoparticles. [0002] technical background [0003] Fe-platinum nanoparticles have good chemical stability and high magnetocrystalline anisotropy (7×10 6 J / cm 3 ), high Curie temperature (480℃) and extremely small superparamagnetic limit size (2.8-3.3nm), so the grain size can be reduced while maintaining high enough thermal stability to obtain smaller records The information unit achieves higher recording density and is therefore an ideal material for ultra-high density magnetic recording media. Since Sun Shouheng used wet chemical method in 2000, using dioctyl ether as solvent and hexadecanediol as reducing agent to reduce platinum acetylacetonate, while thermally decomposing iron pentacarbonyl, the monodisperse, particle size was prepared by reaction at 297℃ for 30 minutes It is a 4nm superparamagnetic face-centered cubic structure of iron platinum (fcc-FePt) nanoparticles. Aft...

Claims

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Application Information

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IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00
Inventor 于永生雷文娟杨微微
Owner HARBIN INST OF TECH
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