Process of thermally decomposing hydrotalcite-like coating to prepare stoichiometric ferrite film

A ferrite thin film, stoichiometric technology, applied in the magnetic layer and other directions, can solve the problems of few precursor varieties, large film pores, environmental pollution, etc., and achieve easy control of reaction conditions, good magnetic properties, and low preparation costs. Effect

Inactive Publication Date: 2007-06-27
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing stoichiometric ferrite films by pyrolysis of hydrotalcite-like coatings, which solves the pr

Method used

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  • Process of thermally decomposing hydrotalcite-like coating to prepare stoichiometric ferrite film
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  • Process of thermally decomposing hydrotalcite-like coating to prepare stoichiometric ferrite film

Examples

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Embodiment 1

[0027] Mg(NO 3 ) 2 , FeCl 2 , Fe(NO 3 ) 3 The mixed salt solution, in which the metal ion concentration is: Mg 2+ 0.33mol / L, Fe 2+ 0.165mol / L, Fe 3+ 0.165 mol / L, and it was placed in a four-necked bottle; then, the alkali dripping salt single drop method was used to drip the mixed solution of sodium hydroxide and anhydrous sodium carbonate (wherein sodium hydroxide : 1.5mol / L, sodium carbonate: 0.7mol / L) until the system reaches a pH value of 11, crystallize in a water bath at 40°C for 15 hours, cool, centrifugally wash and separate, add water and ultrasonically disperse for 30 minutes, and prepare a particle size of 120- 130nm, stable MgFe II Fe III CO 3 LDH Serum. In order to monitor the preparation process and quality of the slurry, a small amount of slurry was taken out and dried, and analyzed by X-ray diffraction. As shown in Figure 2, MgFe II Fe III CO 3 (003), (006), (009) and (110), (113) and other characteristic diffraction peaks of LDH.

[0028] The abo...

Embodiment 2

[0032] Take 3.3×10 -2 mol of Mg(NO 3 ) 2 , 1.65×10 -2 mol of Fe(NO 3 ) 3 and 1.65×10 -2 mol FeCl 2 In the beaker, add 100ml and pass through N 2 deionized water, made into inorganic salt mixed liquid; take 1.5×10 -1 mol of NaOH and 7.0×10 -2 mol sodium carbonate, its mixture was dissolved in 100ml and passed through N 2 Alkaline solution in deionized water. Measure 70ml of lye and inorganic salt solution and add drop by drop quickly to the fully back-mixed rotating liquid film reactor for reaction. The slurry obtained after the reaction is crystallized in a water bath at 40°C for 15h under the protection of nitrogen, cooled, and centrifuged Wash and separate, add water and ultrasonically disperse for 30 minutes, and prepare a stable MgFe with a particle size of 120-130nm II Fe III LDH Serum.

[0033] Using the same conditions and methods as in Example 1, it is also possible to prepare MgFe with a thickness in the micron order, uniform, dense, and a single crystal ...

Embodiment 3

[0035] Prepare stable MgFe under the same conditions as in Example 2 II Fe III CO 3 LDH Serum. Using the slurry coating technology on the cleaned quartz substrate, a uniform and dense MgFe with a thickness of micron is prepared. 2 o 4 Stoichiometric ferrite films.

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Abstract

The process of thermally decomposing hydrotalcite-like coating to prepare stoichiometric ferrite film belongs to the field of ferrite film preparing technology. The process includes the first preparing hydrotalcite-like slurry through single dropping or nucleation/crystallization isolating, coating the slurry on the substrate to obtain hydrotalcite-like coating precursor, and high temperature thermal decomposing to obtain stoichiometric ferrite film. The simple process has low cost and environment friendship, and can prepare compact ferrite film with single crystal phase and excellent magnetic performance.

Description

technical field [0001] The invention belongs to the technical field of ferrite film preparation, and in particular provides a method for preparing a stoichiometric ferrite film by pyrolyzing a hydrotalcite-like coating. Background technique [0002] Ferrite thin film materials have been widely used in research fields such as magnetic micro-devices, pH electrodes, sensors for water, oxygen and urea, and hydrogenation catalysts due to their magnetic, electrical properties, high chemical stability, and high mechanical strength. The exploration of new preparation techniques for ferrite thin films has become a hot research topic in recent years. The coating thermal decomposition method is a chemical film-forming method, which has the advantages of simple preparation process, cheap equipment, good film uniformity, can form a film on an irregularly shaped surface, and is suitable for large-area film production, and the chemical composition is easy to control. It can be designed an...

Claims

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Application Information

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IPC IPC(8): C04B35/26H01F10/20
Inventor 杨兰尹烈张英超李峰
Owner BEIJING UNIV OF CHEM TECH
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