Lanthanum-doped nano-barium ferrite thin film and preparation method thereof

A barium ferrite and lanthanum-doped technology, which is applied in the field of preparing the precursor of lanthanum-doped nano-barium ferrite, to achieve the effects of increasing wave-absorbing performance, controlling film composition and microstructure, and facilitating quantitative doping

Inactive Publication Date: 2011-12-14
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the lanthanum-doped nano-barium ferrite thin film and its preparation by sol-gel method

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  • Lanthanum-doped nano-barium ferrite thin film and preparation method thereof
  • Lanthanum-doped nano-barium ferrite thin film and preparation method thereof
  • Lanthanum-doped nano-barium ferrite thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This experiment is to prepare a rare earth lanthanum-doped nano-barium ferrite film with a ratio of La / Ba=0.2. The specific steps are as follows:

[0027] 1. Put barium nitrate (0.5g) and lanthanum nitrate (0.1243g) into beaker A, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;

[0028] 2. Put the main salt ferric nitrate (6.956g) into the B beaker, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;

[0029] 3. Add citric acid (10.252g) into the B beaker and stir until completely dissolved;

[0030] 4. Put the beaker A into the beaker B, and stir for 5 minutes; slowly add ethylene glycol (5.44ml), continue to stir and control the temperature between 70°C, and slowly evaporate to obtain the sol;

[0031] 5. Soak the silica substrate in the sol, and use the dipping-pulling method to coat the film; pull it out of the liquid surface vertically at a rate of 2mm / s to fo...

Embodiment 2

[0036] This experiment is to prepare a rare earth lanthanum-doped nano-barium ferrite film with a ratio of La / Ba=0.4. The specific steps are as follows:

[0037] 1. Put barium nitrate (0.5g) and lanthanum nitrate (0.2486g) into beaker A, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;

[0038] 2. Put the main salt ferric nitrate (6.956g) into the B beaker, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;

[0039] 3. Add citric acid (10.453g) into beaker B and stir until completely dissolved;

[0040] 4. Put the beaker A into the beaker B and stir for 5 minutes; slowly add ethylene glycol (5.55ml), continue to stir and keep the temperature between 80°C and evaporate slowly to obtain a sol with a suitable viscosity;

[0041] 5. Soak the silica substrate in the sol, and use the dipping-pulling method to coat the film; pull it up and out of the liquid surface at a rate of ...

Embodiment 3

[0046] This embodiment is to prepare a rare earth lanthanum-doped nano-barium ferrite film with a ratio of La / Ba=0.6, and the specific steps are as follows:

[0047] 1. Put barium nitrate (0.5g) and lanthanum nitrate (0.3729g) into beaker A, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;

[0048] 2. Put the main salt ferric nitrate (6.956g) into the B beaker, add 200ml of distilled water to make the solution viscosity 2-4mPa·s, stir until completely dissolved;

[0049] 3. Add citric acid (10.654g) into the B beaker and stir until completely dissolved;

[0050] 4. Put the beaker A into the beaker B, stir for 5 minutes; slowly add ethylene glycol (5.65ml), continue to stir and keep the temperature between 75°C, evaporate slowly to obtain a sol with a suitable viscosity;

[0051] 5. Soak the silica substrate in the sol, and use the dipping-pulling method to coat the film; pull it out of the liquid surface vertically at a ra...

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Abstract

The invention relates to a lanthanum-doped nano-barium ferrite film and a preparation method thereof. The technical characteristics are that the formula is as follows: ethylene glycol 1.48-1.60g / 100ml, citric acid 2.51-2.71g / 100ml, ferric nitrate 1.74g / 100ml, barium nitrate 0.125g / 100ml and lanthanum nitrate 0.03~0.125g / 100ml. The preparation method uses ferric nitrate, barium nitrate, lanthanum nitrate, etc. as raw materials to prepare the precursor of lanthanum-doped nano-barium ferrite by sol-gel method; , Lanthanum nitrate as the main salt, citric acid as a complexing agent, ethylene glycol as a co-complexing agent, and the immersion-pulling method is used to form the film. The advantages of this method are: simple process flow and low cost; it is convenient to prepare thin films on substrates of various shapes to obtain high-purity lanthanum-doped barium ferrite nano-films, and the thin films can be used to prepare magnetic recording materials and wave absorbing materials .

Description

technical field [0001] The invention relates to a lanthanum-doped nano-barium ferrite thin film and a preparation method thereof, mainly using ferric nitrate, barium nitrate, lanthanum nitrate, etc. as raw materials to prepare a precursor of lanthanum-doped nano-barium ferrite by using a sol-gel method body; with clean silicon dioxide as the substrate, ferric nitrate, barium nitrate, and lanthanum nitrate as the main salt, citric acid as the complexing agent, and ethylene glycol as the auxiliary complexing agent, the film is formed by dipping-pulling method. Background technique [0002] The current research on the nano-barium ferrite material shows that the material has unsatisfactory absorbing properties and the absorbing frequency band needs to be further broadened. Rare earth elements are rich in f-layer electrons, and their compounds themselves are absorbing materials with excellent magnetic properties. Therefore, the doping of rare earth elements will inevitably play a...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C04B35/26C04B35/624
Inventor黄英杨永峰齐暑华李玉青黄飞
OwnerNORTHWESTERN POLYTECHNICAL UNIV