A method for preparing hard magnetic iron-platinum nanoparticles using inorganic salts as precursors

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

Inactive Publication Date: 2018-03-27
HARBIN INST OF TECH
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Problems solved by technology

[0005] 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 nanoparticles obtained by surface coating method at high temperature annealing or salt bath method , and provide a method for preparing hard magnetic iron-platinum nanoparticles using inorganic salts as precursors

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  • A method for preparing hard magnetic iron-platinum nanoparticles using inorganic salts as precursors
  • A method for preparing hard magnetic iron-platinum nanoparticles using inorganic salts as precursors
  • A method for preparing hard magnetic iron-platinum nanoparticles using inorganic salts as precursors

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specific Embodiment approach 1

[0025] Embodiment 1: This embodiment is a method for preparing hard magnetic iron-platinum nanoparticles using inorganic salt as a precursor, specifically according to the following steps:

[0026] 1. Mixing and stirring under protective gas: Add ferrous chloride, potassium chloroplatinate and oleylamine into a three-necked flask, and pass nitrogen gas and exhaust air for 40 minutes under magnetic stirring and room temperature conditions to obtain a mixture; The ratio of the amount of substance of iron and potassium chloroplatinate is 1:(1~1.2); the ratio of the amount of substance of potassium chloroplatinate and oleylamine is 1:(150~160);

[0027] 2. Heating: Heat the mixture prepared in step 1 from room temperature to 200°C at a heating rate of 5°C / min to 10°C / min under the conditions of magnetic stirring and nitrogen protection, and then heat it under magnetic stirring, nitrogen protection and a temperature of 200 Keep warm for 4h~5h at ℃; heat from 200℃ to 350℃ at a heati...

specific Embodiment approach 2

[0035] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the ratio of the amount of ferrous chloride and potassium chloroplatinate described in step 1 is 1:1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the ratio of potassium chloroplatinate and oleylamine in step 1 is 1:150. Others are the same as in 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. technical background [0002] Iron-platinum nanoparticles have good chemical stability and high magnetocrystalline anisotropy (7×10 6 J / cm 3 ), high Curie temperature (480°C) 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 Information unit, to achieve higher recording density, so it is an ideal material for ultra-high density magnetic recording media. Since Sun Shouheng used the wet chemical method in 2000 to reduce platinum acetylacetonate with dioctyl ether as the solvent and cetanediol as the reducing agent, and thermally decompose iron pentacarbonyl at the same time, and reacted at 297°C for 30 minutes to prepare a monodisperse, particle-sized Iron-platinum (fcc-FePt) nanoparticles with a superparamagnetic face-centered cubic structure o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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