Process of thermally decomposing hydrotalcite-like coating to prepare stoichiometric ferrite film
A ferrite thin film, stoichiometric technology, applied in the direction of the magnetic layer, etc., can solve the problems of few precursors, large pores in the film, high price, etc., and achieve easy control of reaction conditions, good magnetic properties, and low preparation costs. Effect
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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+ 0.165mol / L, and it is placed in the four-necked bottle; Adopt alkali dropping salt single drop method afterwards, 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 the prepared particle size is 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 then analyzed by X-ray diffraction. The results are as follows: figure 2 As shown, the occurrence of MgFe II Fe III CO 3 (003), (006), (009) and (110), (113) and other characte...
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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