Yttrium-doped nickel-zinc-cobalt ferrite and preparation method thereof

A technology of cobalt ferrite and nickel zinc, which is applied in the field of soft magnetic ferrite materials, can solve the problems of easy pollution of the environment, high cost, and long preparation cycle, and achieve no pollution in the process, low DC resistivity, improved magnetic properties and The effect of electrical properties

Inactive Publication Date: 2021-01-01
CHENGDU UNIV OF INFORMATION TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The material is synthesized by a hydrothermal method, which has a long preparation period, high cost, and is easy to pollute the environment

Method used

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  • Yttrium-doped nickel-zinc-cobalt ferrite and preparation method thereof
  • Yttrium-doped nickel-zinc-cobalt ferrite and preparation method thereof
  • Yttrium-doped nickel-zinc-cobalt ferrite and preparation method thereof

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preparation example Construction

[0041] The preparation method of the nickel-zinc-cobalt ferrite doped with yttrium of the present invention comprises the steps:

[0042] a. Preparation of wet gel precursor: Mix nickel salt, zinc salt, cobalt salt, iron salt, yttrium salt and water, add citric acid after dissolving, stir and react at 70-90°C for 2-4 hours, and control the reaction system The pH value is 6.5-7.5, so as to obtain the wet gel precursor;

[0043] b. Preparing the xerogel precursor: drying the wet gel precursor to obtain the xerogel precursor;

[0044] c. Self-propagating combustion reaction: the dry gel precursor is mixed with an igniter and ignited, self-propagating into nano-scale powder, and then adding polyvinyl alcohol for granulation;

[0045] d. Billet making: the granulated powder is pressed into a billet;

[0046] e. Sintering: Sinter the blank at 1000-1200°C for 1-4 hours to obtain yttrium-doped nickel-zinc-cobalt ferrite.

[0047] The method of the present invention adopts the combi...

Embodiment 1

[0067] 1. According to Ni 0.6 Zn 0.3 co 0.1 Y 0.025 Fe 1.975 o 4 The components are batched and configured as a solution with a volume of 1L and a concentration of 0.15mol / L. Weigh Ni(NO 3 ) 2 ·6H 2 O 26.1720g, Zn(NO 3 ) 2 ·6H 2 O 13.3871g, Co(NO 3 ) 2 ·6H 2 O4.3655g, Fe(NO 3 ) 3 9H 2 O 119.6909g, Y (NO 3 ) 3 ·6H 2 0.1.4365g, 165.052g of powder in total; Add all of the above powders into a beaker, add deionized water to mix and stir for 30 minutes, until all nitrates are dissolved, and add citric acid that is 3:1 with the nitrate molar ratio;

[0068] 2. Stir the prepared solution at 80° C. for 3 hours with a constant temperature magnetic stirrer, and gradually add ammonia water to keep the pH value at about 7, so as to obtain a wet gel precursor;

[0069] 3. Put the obtained wet gel precursor into an oven and dry it at 80°C; and obtain the dry gel precursor;

[0070] 4. Add a little alcohol to the dry gel precursor and ignite it, self-propagating combustio...

Embodiment 2

[0075] 1. According to Ni 0.6 Zn 0.3 co 0.1 Y 0.05 Fe 1.95 o 4 The components are batched and configured as a solution with a volume of 1L and a concentration of 0.15mol / L. Weigh Ni(NO 3 ) 2 ·6H 2 O 26.1720g, Zn(NO 3 ) 2 ·6H 2 O 13.3871g, Co(NO 3 ) 2 ·6H 2 O4.3655g, Fe(NO 3 ) 3 9H 2 O 118.1759g, Y (NO 3 ) 3 ·6H 2 0. 2.8730g, 164.973g of powder in total; Add all the above powders into a beaker, add deionized water to mix and stir for 30 minutes, until all nitrates are dissolved, and add citric acid with a nitrate molar ratio of 3:1;

[0076] 2. Stir the prepared solution at 80° C. for 3 hours with a constant temperature magnetic stirrer, and gradually add ammonia water to keep the pH value at about 7, so as to obtain a wet gel precursor;

[0077] 3. Put the obtained wet gel precursor into an oven and dry it at 80°C; and obtain the dry gel precursor;

[0078] 4. Add a little alcohol to the dry gel precursor and ignite it, self-propagating combustion into nano...

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Abstract

The invention relates to nickel-zinc-cobalt ferrite and a preparation method thereof, and belongs to the technical field of soft magnetic ferrite materials. The technical problem to be solved by the invention is to provide the yttrium-doped nickel-zinc-cobalt ferrite prepared by high-performance microwave sintering. The molecular formula of the yttrium-doped nickel-zinc-cobalt ferrite is Ni < m >Zn < n > Co < 1 > m < n > Y < x > Fe < 2 > x < O4 >, and the electromagnetic performance of the material is improved by combining microwave sintering and sol-gel self-propagating on the basis of Ni <m > Zn < n > Co < 1 > m < n > Fe < 2 > O < 4 > ferrite. Iron deficiency and Y < 3 + > are used for replacing Fe < 3 + > to improve the magnetic performance and the electrical performance of the material, the preparation process is simple, the process is pollution-free, the obtained material simultaneously obtains high sintering density, initial permeability and direct-current resistivity and low coercive force and dielectric loss, a key material can be provided for high-frequency inductors and capacitors. The current situation that related electronic components in the field of high-frequency weak current do not exist in China is solved, the core competitiveness of miniaturization and integration of high-frequency and even ultrahigh-frequency electronic devices in China is expected to be improved, and foreign technical blockage is broken through.

Description

technical field [0001] The invention relates to a nickel-zinc-cobalt ferrite and a preparation method thereof, in particular to a nickel-zinc-cobalt ferrite doped with yttrium and a preparation method thereof, belonging to the technical field of soft magnetic ferrite materials. Background technique [0002] Spinel type soft ferrite (MeFe 2 o 4 , Me=Mn, Ni, Zn, Mg, etc.) have high saturation magnetization (150-300emu / g), Curie temperature (450-460°C), DC resistivity (10 5 ~10 9 Ω·m) and excellent electromagnetic characteristics. In recent years, continuous breakthroughs have been made in the field of high-frequency and weak currents, and it has the important potential to become high-frequency inductors, capacitors, filters and other devices. However, after the successful development of various electronic components such as circulators, isolators and phase shifters, no major breakthroughs have been made in the research of multilayer chip inductors, capacitors and filters in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622C04B35/624C04B35/63
CPCC04B35/2608C04B35/622C04B35/624C04B35/6303C04B2235/3272C04B2235/3284C04B2235/3279C04B2235/3275C04B2235/3225C04B2235/602C04B2235/656C04B2235/6567C04B2235/77
Inventor 李乐中吴晓辉吴波王瑞涂小强何磊
Owner CHENGDU UNIV OF INFORMATION TECH
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