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Preparation of superfine cubic phase barium titanate powder
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A phase barium titanate, cubic technology, applied in the field of powder material preparation, can solve the problems of high raw material cost, complicated process, etc., and achieve the effects of reducing production cost, simple operation process and cost reduction
Inactive Publication Date: 2009-02-25
EAST CHINA NORMAL UNIVERSITY
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The cost of raw materials required is high and the process is complicated
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Embodiment 1
[0019] a. Weigh 40g of sodium hydroxide, 10g of industrial grade metatitanic acid and 31.5g of barium hydroxide octahydrate into a 250ml beaker, add 100ml of deionized water; stir for 30 minutes.
[0020] b. Sonicate the above mixture for 60 minutes.
[0021] c. The above mixture was transferred to an autoclave, and reacted at 130° C. for 15 hours.
[0022] d. After the reaction is finished, perform suction filtration to obtain a solid, add 125 ml of 1 mol / L acetic acid to the solid, suction filter, wash with deionized water until pH = 7, dry at 60°C, and grind to obtain Ultrafine cubic barium titanate 17.50g.
Embodiment 2
[0024] a. Weigh 20g of sodium hydroxide, 5g of industrial grade metatitanic acid and 18.9g of barium hydroxide octahydrate into a 100ml beaker, add 50ml of deionized water; stir for 30 minutes.
[0025] b. Sonicate the above mixture for 30 minutes.
[0026] c. Transfer the above mixture to an autoclave, and react at 170° C. for 4 hours.
[0027] d. After the reaction is finished, centrifuge to obtain a solid, add 60ml of 1mol / L acetic acid to the solid, filter with suction, wash with deionized water to pH=7, dry at 60°C, and grind to obtain super Fine cubic phase barium titanate 7.80g.
Embodiment 3
[0029] a. Weigh 28g of potassium hydroxide, 5g of industrial grade metatitanic acid and 18.9g of barium hydroxide octahydrate into a 150ml beaker, add 50ml of deionized water; and stir for 30 minutes.
[0030] b. Sonicate the above mixture for 40 minutes.
[0031] c. Transfer the above mixture to an autoclave, and react at 150° C. for 15 hours.
[0032] d. After the reaction is finished, perform suction filtration to obtain a solid, add 60 ml of 1 mol / L acetic acid to the solid, suction filter, wash with deionized water until pH = 7, dry at 60°C, and grind to obtain Ultrafine cubic barium titanate 8.24g.
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Abstract
The invention discloses a method for preparing superfine cubic phase bariumtitanatepowder, which comprises the following steps: sodiumhydroxide or potassiumhydroxide, industrial metatitanic acid, bariumhydroxide octahydrate and water are mixed at the mol ratio of 10:1:0.5-2:55, stirred for 30min and then ultrasonically treated for 30-60min; the obtained mixture is transferred to a high pressure reaction kettle and reacts at the temperature of 90-200 DEG C for 4-15h; when the reaction is completed, the mixture is filtered or centrifugated to obtain a solid; the obtained solid is added with 1mol / L acetic acid until no bubble is generated, filtered, washed with deionized water until the pH value equals 7, and the solid is dried at the temperature of 60-80 DEG C and ground to obtain the superfine cubic phase bariumtitanate. The method has the advantages of simple operations, low requirement for equipment and low cost, and that the method is suitable for industrial production.
Description
technical field [0001] The invention relates to the preparation of a powder material, in particular to a method for preparing superfine cubic phase barium titanatepowder by using industrial-grade metatitanic acid as a titanium source. Background technique [0002] As an important electronic ceramicraw material, barium titanate has attracted more and more attention due to its good ferroelectric and dielectric properties. It is widely used in high dielectric constant capacitors, PTC (positivetemperature coefficient) resistors, semiconductor As well as the production of ferroelectric memory, it is known as "the pillar of the electronics industry". The size and distribution uniformity of barium titanate powder particles, the agglomeration between particles, etc. will affect the performance of barium titanateceramic components. Due to the miniaturization of particle size, the surface area of nano barium titanate increases sharply, and the proportion of atoms on the particle...
Claims
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