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Method for preparing FePt:RE amorphous alloy nano material mixed with rare earth elements

A rare earth element and nano-alloy technology, applied in the field of materials, can solve the problems of uneven doping, strict technical requirements, large particle size, etc., and achieve the effects of good monodispersity, uniform particle size, and inhibiting phase transformation.

Inactive Publication Date: 2009-09-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods all have problems such as harsh equipment and technical requirements, large particle size, and uneven doping.

Method used

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  • Method for preparing FePt:RE amorphous alloy nano material mixed with rare earth elements
  • Method for preparing FePt:RE amorphous alloy nano material mixed with rare earth elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: the preparation of FePt:Eu alloy magnetic nanoparticles

[0029] In the first step, 0.031mmol H 2 PtCl 6 ·6H 2 O with 0.031mmol Fe 2 (C 2 o 4 ) 3 ·5H 2 O and 0.007mmolEu(NO 3 ) 3 Completely dissolve in 2ml of absolute ethanol, then add 0.2g of sodium oleate and 0.011mol of DB24C8 in sequence, and stir with ultrasonic vibration for 10 minutes until the solid is completely dissolved.

[0030] In the second step, add a mixed solution of 4ml 1,2-propanediol and 2ml oleic acid, then transfer the whole mixed system to the autoclave, raise the temperature to 423K at a rate of 2°C / min, and heat it in a muffle furnace at 423K Under the condition of insulation for 15 hours, after the reaction was completed, it was cooled to room temperature.

[0031] In the third step, the particles deposited at the bottom of the reactor were washed several times with absolute ethanol and distilled water successively, and centrifuged at a speed of 5000 rpm for 10 minutes, ...

Embodiment 2

[0033] Embodiment 2: the preparation of FePt:Dy alloy magnetic nanoparticles

[0034] 0.031mmol H 2 PtCl 6 ·6H 2 O with 0.031mmol Fe 2 (C 2 o 4 ) 3 ·5H 2 O and 0.007mmol Dy(NO 3 ) 3Completely dissolve in 2ml of absolute ethanol, then add 0.2g of sodium oleate and 0.011mol of DB24C8 in sequence, and stir with ultrasonic vibration for 10 minutes until the solid is completely dissolved. Add a mixed solution of 4ml 1,2-propanediol and 2ml oleic acid, then transfer the whole mixed system to an autoclave, react in a muffle furnace at 423K for 15 hours, and cool to room temperature after the reaction. The rest are operated according to the steps described in Example 1. figure 1 The TEM photomicrograph in (b) shows that the product is an amorphous nanoscale particle with a small particle size and monodispersity. figure 2 When excited at 397nm, two emission peaks at 467nm and 597nm appear on the emission spectrum of FePt:Dy, which correspond to Dy 3+ 4F 9 / 2 -6H 15 / 2 with...

Embodiment 3

[0035] Embodiment 3: the preparation of FePt: Ce alloy magnetic nanoparticles

[0036] 0.031mmol H 2 PtCl 6 ·6H 2 O with 0.031mmol Fe 2 (C 2 o 4 ) 3 ·5H 2 O and 0.007mmol Ce(NO 3 ) 3 Completely dissolve in 2ml of absolute ethanol, then add 0.2g of sodium oleate and 0.011mol of DB24C8 successively, and react according to the steps described in Example 2. figure 1 The TEM photomicrograph in (c) shows that the product is an amorphous nanoscale particle with a small particle size and monodispersity.

[0037] The magnetic performance characterization data of the product obtained in Table 1 embodiment 1, example 2, example 3

[0038] Alloy nanoparticles

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Abstract

The invention discloses a method for preparing FePt:RE amorphous alloy nano material mixed with rare earth elements, platinum-containing inorganic salt / platinum-containing composition, iron-containing inorganic salt / iron-containing composition and water soluble salt of RE(RE=Eu, Dy, Ce) are used as the reaction precursor, the reaction precursor, organic solvent and phase transfer catalyst crown ether are put into a high pressure kettle, and the needed product is obtained through reaction by making use of the phase transfer among the reactants and the coreduction of the reaction precursor and taking oleic acid as the stabilizer. Based on the invention, alloy nano particles of FePt:Ce, FePt:Dy and FePt:Eu with the particle diameter being 3-5nm can be synthesized, the synthesized alloy nano particles have chemical out-of sequence fcc structure, the amorphous state inclination of the alloy is reinforced by mixing Eu, and the coercive force is greatly enhanced. The alloy nano particles of FePt:Ce and FePt:Dy are processed by backfire at 600 DEG C, the structure thereof carries out phase variation on sequenced L10. At the same time, with the enhanced coercive force, the thermal stability of the FePt:Eu alloy is reinforced by mixing Eu, thus having certain phase variation inhibition effect; in addition, the FePt alloy nano particles are caused to have fluorescence by mixing rare earth elements.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of novel fluorescent FePt alloy nanoparticles doped with rare earth elements RE (RE=Eu, Dy, Ce). Background technique [0002] With the rapid development of the electronic information industry, the demand for high-density and large-capacity magnetic recording devices is becoming more and more intense. The research on ultra-high-density magnetic recording has become an important frontier topic in magnetic materials and engineering research, showing very Attractive application prospects. Among them, FePt nanostructure materials have good chemical stability and high magnetocrystalline anisotropy, showing great application potential in the field of ultra-high-density information storage. L 10 Phase FePt alloy has very high magnetocrystalline anisotropy, and its uniaxial magnetocrystalline anisotropy constant Ku is (6.6~10)×10 7 erg / cm 2 , which ...

Claims

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Application Information

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IPC IPC(8): C22C45/00
Inventor 张凡温鸣赵文钢朱远征杨丹
Owner TONGJI UNIV
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