Method for preparing rare-earth magnetic ferrite through in-situ polymerization cracking process

A magnetic ferrite, in-situ polymerization technology, applied in the field of preparation of rare earth magnetic ferrite by in-situ polymerization cracking method, can solve the problems of difficult control of nanoparticle size distribution, poor structural stability, high preparation temperature, etc., and achieve nucleation and The effect of accelerated growth rate, increased diffusion ability, and low preparation temperature

Inactive Publication Date: 2014-08-06
HUBEI ENG UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the common problems of high preparation temperature, difficulty in controlling the size distribution of nanoparticles, poor structural stability, a large number of crystal defects and impurity in the preparation of rare earth magnetic nano-ferrite materials by the existing method, and provide a A new preparation method of rare earth magnetic nano-ferrite material

Method used

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  • Method for preparing rare-earth magnetic ferrite through in-situ polymerization cracking process
  • Method for preparing rare-earth magnetic ferrite through in-situ polymerization cracking process
  • Method for preparing rare-earth magnetic ferrite through in-situ polymerization cracking process

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Embodiment 1

[0024] Preparation of rare earth magnetic ferrite PrFeO by an in-situ polymerization cracking method 3 Methods:

[0025] Fe(NO 3 ) 3 9H 2 O and Pr(NO 3 ) 3 ·6H 2 O was dissolved in an aqueous solution of acrylic acid and stirred well to form a transparent homogeneous solution. The mass ratio of the substance in the solution Fe(NO 3 ) 3 9H 2 O: acrylic acid: deionized water = 1:10:1. Then to the homogeneous solution, the concentration of 1 / 30 of the volume of acrylic acid was added to be 5 wt% (NH 4 ) 2 S 2 o 8 Aqueous solution was used as initiator, mixed evenly and then stirred at 80°C for 2 hours, fully polymerized to form a uniformly distributed polymer precursor, then dried at 120°C for 12 hours, and then crushed (thermogravimetric of the resulting product - difference see heat map figure 1 ), pyrolyzed at 500°C for 3 hours in an air atmosphere, and obtained a powder product after cooling to room temperature, which was confirmed to be PrFeO by characterizati...

Embodiment 2

[0027] Preparation of rare earth magnetic ferrite SmFeO by an in-situ polymerization cracking method 3 Methods:

[0028] Fe(NO 3 ) 3 9H 2 O and Sm(NO 3 ) 3 ·6H 2 O was dissolved in an aqueous solution of acrylic acid and stirred well to form a transparent homogeneous solution. The mass ratio of the substance in the solution Fe(NO 3 ) 3 9H 2 O: acrylic acid: deionized water = 1:10:1. Then to the homogeneous solution, the concentration of 1 / 30 of the volume of acrylic acid is 5wt% (NH 4 ) 2 S 2 o8 The aqueous solution is used as the initiator, mixed evenly and then stirred at 80°C for 2 hours to carry out sufficient polymerization reaction to form a uniformly distributed polymer precursor, then dried at 120°C for 12 hours, then crushed, and placed in an air atmosphere at 500°C After pyrolysis for 3 hours, the powder product was obtained after cooling to room temperature, which was confirmed to be SmFeO by characterization 3 .

Embodiment 3

[0030] Preparation of rare earth magnetic ferrite EuFeO by an in-situ polymerization cracking method 3 Methods:

[0031] Fe(NO 3 ) 3 9H 2 O and Eu(NO 3 ) 3 ·6H 2 O was dissolved in an aqueous solution of acrylic acid and stirred well to form a transparent homogeneous solution. The mass ratio of the substance in the solution Fe(NO 3 ) 3 9H 2 O: acrylic acid: deionized water = 1:10:1. Then to the homogeneous solution, the concentration of 1 / 30 of the volume of acrylic acid is 5wt% (NH 4 ) 2 S 2 o 8 The aqueous solution is used as the initiator, mixed evenly and then stirred at 80°C for 2 hours to carry out sufficient polymerization reaction to form a uniformly distributed polymer precursor, then dried at 120°C for 12 hours, then crushed, and placed in an air atmosphere at 500°C After pyrolysis for 3 hours, the powder product was obtained after cooling to room temperature, which was confirmed to be EuFeO by characterization 3 .

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Abstract

The invention discloses a method for preparing rare-earth magnetic ferrite through an in-situ polymerization cracking process. Before a reaction begins, a stable solution is formed by dispersing metal ions in the stoichiometric ratio in an acrylic aqueous solution, various reactant metal ions are thoroughly mixed, and an initiator is added so that a polymerization reaction is aroused quickly. Lots of heat is released in the reaction, and the volume of the reactants expands sharply due to water vapor, so that a honeycombed solid-state polymer is formed. Due to volume expansion, the metal ions are dispersed more evenly, the nanocrystallization degree is high, the reaction activity among nanoparticles is increased, the diffusion distance of ions in a solid-phase reaction is reduced, the diffusibility is improved, and the nucleation and growth speed of a crystalline-state material is accelerated, and then a material uniform in dimension can be obtained through subsequent relative low heat treatment. The prepared material is good in crystallinity and few in crystal defects, and the nanoparticles are dispersed evenly. The method for preparing the rare-earth magnetic ferrite is simple in process, low in preparation temperature, short in heat-preserving time and advantageous for industrial production.

Description

technical field [0001] The invention relates to the technical field of preparation of rare earth magnetic materials, in particular to a method for preparing rare earth magnetic ferrite by an in-situ polymerization and cracking method. Background technique [0002] Crystal rare earth ferrite materials have attracted the attention of many researchers due to their wide application in optomagnetic materials, catalysts, fuel cell electrode materials, and magnetic sensing materials. The common synthesis method is mainly prepared by solid-solid reaction of iron oxide and rare earth oxide under certain stoichiometric ratio conditions. Because the solid-solid reaction ion diffusion rate is slow, high temperature reaction is often used to prepare such materials. . Such as the preparation of GdFeO 3 The material is to use α-Fe 2 o 3 and Gd 2 o 3 Prepared by solid-solid reaction at 1000-1100°C. Rare earth ferrite material (abbreviation: LnFeO 3 ) is generally considered to be a ...

Claims

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Application Information

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IPC IPC(8): C04B35/40C04B35/50C04B35/622
Inventor 王锋丁瑜池琴彭建张宇沈浩德王婷
Owner HUBEI ENG UNIV
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