Preparation method of Bi1-xNdxFeO3 rare earth ferrite magnetic wave-absorbing material

A magnetic wave absorbing and ferrite technology, applied in the fields of magnetic field/electric field shielding, electrical components, etc., can solve the problems of limited electromagnetic response, weak ferromagnetism and ferroelectricity, etc., to achieve easy regulation, simple process, and product uniformity. and high purity

Inactive Publication Date: 2020-05-29
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

BiFeO 3 Due to the coexistence of magnetoelectric properties and ferromagnetic properties, there have been researches on its microwave electromagnetic properties in recent years, but its weak ferromagnetism and ferroelectricity limit its electromagnetic response.

Method used

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  • Preparation method of Bi1-xNdxFeO3 rare earth ferrite magnetic wave-absorbing material
  • Preparation method of Bi1-xNdxFeO3 rare earth ferrite magnetic wave-absorbing material
  • Preparation method of Bi1-xNdxFeO3 rare earth ferrite magnetic wave-absorbing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a Bi 1-x Nd x FeO 3 Preparation method of rare earth ferrite magnetic wave absorbing material, see figure 1 ,Include:

[0037] (1) Analytically pure bismuth nitrate pentahydrate (Bi(NO) 3 ) 3 ·5H 2 O), ferric nitrate nonahydrate (Fe(NO) 3 ) 3 ·9H 2 O) as the ion source of Bi and Fe, according to BiFeO 3 The stoichiometric ratio of the sample is weighed, and ultrasonic dispersion is utilized to dissolve the sample into the dilute nitric acid with a volume ratio of 1:7 to obtain a solution;

[0038] (2) adding the tartaric acid that is 1:1 with the sum molar ratio of the above-mentioned metal ions in the solution, and adjusting pH by dripping ammonia water is 5.0;

[0039] (3) Put the prepared solution in a water bath at 80°C, and stir with a magnetic stirrer for 2 hours until the solution is uniform and in the form of a transparent wet gel;

[0040] (4) drying the wet gel in a drying oven at 100°C for 20 hours to obtain a dry gel;

[0041] (5) put the obtained ...

Embodiment 2

[0052] a Bi 1-x Nd x FeO 3 The preparation method of the rare earth ferrite magnetic wave absorbing material is basically the same as that of Example 1, the difference is:

[0053] In step (1), also added neodymium nitrate hexahydrate (Nd(NO 3 ) 3 ·6H 2 O) as the ion source of Nd, according to Bi 0.95 Nd 0.05 FeO 3 The stoichiometric ratio of the sample is weighed; the volume ratio of each sample and dilute nitric acid is 1:5;

[0054] In step (2), the sum molar ratio of tartaric acid and metal ions is 3:1, and pH is adjusted to 7.0 by dripping ammonia water;

[0055] In step (3), the temperature of the water bath was 70°C, and the stirring time was 3h;

[0056] In step (4), the drying oven temperature is 110°C, and the drying time is 18h;

[0057] In step (5), the pre-burning temperature is 350°C, and the pre-burning time is 5h;

[0058] In step (6), the mass fraction of polyvinyl alcohol glue is 8%, and the pressure is 10.0Mpa;

[0059] In step (7), debonding is ...

Embodiment 3

[0065] a Bi 1-x Nd x FeO 3 The preparation method of the rare earth ferrite magnetic wave absorbing material is basically the same as that of Example 1, the difference is:

[0066] In step (1), also added neodymium nitrate hexahydrate (Nd(NO 3 ) 3 ·6H 2 O) as the ion source of Nd, according to Bi 0.9 Nd 0.1 FeO 3 The stoichiometric ratio of the sample is weighed; the volume ratio of each sample and dilute nitric acid is 1:10;

[0067] In step (2), the sum molar ratio of tartaric acid and metal ions is 2:1, and pH is adjusted to 7.0 by dripping ammonia water;

[0068] In step (3), the temperature of the water bath is 60°C, and the stirring time is 5h;

[0069] In step (4), the drying oven temperature is 100°C, and the drying time is 24h;

[0070] In step (5), the pre-burning temperature is 400°C, and the pre-burning time is 2h;

[0071] In step (6), the mass fraction of polyvinyl alcohol glue is 7%, and the pressure is 10.0Mpa;

[0072] In step (7), debonding is car...

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Abstract

The invention discloses a preparation method of a Bi1-xNdxFeO3 rare earth ferrite magnetic wave-absorbing material, wherein the method comprises the steps: (1) dissolving raw materials bismuth nitrate, ferric nitrate and neodymium nitrate respectively as ion sources of Bi, Fe and Nd into dilute nitric acid; (2) adding tartaric acid, and adjusting the pH value to 5-7; (3) stirring at the temperature of 60-80 DEG C until the solution is uniform and is in a transparent gel wet gel state; (4) drying the obtained wet gel at the temperature of 100-120 DEG C to obtain dry gel; (5) presintering the dry gel at the temperature of 300-400 DEG C to remove organic matters to obtain precursor powder; (6) granulating the precursor powder by using polyvinyl alcohol glue, grinding, and pressing and formingthe powder; and (7) carrying out heat preservation and glue discharging on the pressed and formed sample in an annealing furnace at the temperature of 400 DEG C, and annealing at the temperature of 600-800 DEG C. The magnetic wave-absorbing material prepared by the method disclosed by the invention has a relatively wide microwave absorption frequency band and relatively wide microwave absorptionefficiency in a 2-18 GHz microwave frequency band.

Description

technical field [0001] The invention relates to a preparation method of a rare earth ferrite magnetic wave absorbing material, in particular to a Bi 1-x Nd x FeO 3 Preparation method of rare earth ferrite magnetic wave absorbing material. Background technique [0002] In modern life, more and more electronic products enter people's daily life and work. While these electronic products bring us convenience, they also inevitably cause electromagnetic radiation and electromagnetic interference, which not only affects the surrounding environment. Instruments and electronic equipment cause interference, and disordered and super-strong electromagnetic radiation will seriously affect human production and life, and cause great harm to human health. According to research, electromagnetic radiation has become the fourth largest pollution after water, air and noise pollution, which is extremely harmful and difficult to protect. For example: in the power system, the work of electroni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/40H05K9/00
CPCC04B35/2675C04B2235/443C04B2235/96H05K9/0081
Inventor 姚青荣饶光辉田创邓健秋王江周怀营
Owner GUILIN UNIV OF ELECTRONIC TECH
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