Preparation method of barium strontium titanate ceramic

A technology of barium strontium titanate and ceramics, applied in the field of dielectric ceramic materials, can solve the problem of high cost, achieve the effects of good dielectric properties, high product activity and lower production costs

Inactive Publication Date: 2016-01-27
UNIV OF JINAN
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The traditional process of preparing BST materials by the sol-gel method uses barium acetate, strontium acetate, and tetrabutyl titanate as raw materials, and the cost is relatively high.

Method used

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  • Preparation method of barium strontium titanate ceramic
  • Preparation method of barium strontium titanate ceramic
  • Preparation method of barium strontium titanate ceramic

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Embodiment 1

[0032] (1) Weigh 0.02mol of TiO 2 Put the powder into a plastic bottle and add HF acid to heat in a water bath. The temperature of the water bath is 80°C for about 24 hours. 2 After the powder is completely dissolved, slowly add ammonia water to the HF acid solution of Ti until a white precipitate is formed and the solution becomes alkaline. After suction filtration to obtain a white precipitate, add 0.06 mol of citric acid according to the ratio of n (citric acid): n (metal ion) = 3:1, and stir in a heat-collecting magnetic stirrer until the solution becomes white and transparent . Then 0.01mol of Ba(NO 3 ) 2 , Sr(NO 3 ) 2 Dissolve Ti in a citric acid solution, stir for 30 minutes, then add 60 ml of ethylene glycol and stir magnetically at a constant temperature for 30 minutes to obtain a precursor solution. The temperature of the magnetic stirrer is always 80°C.

[0033] (2) Dry the precursor solution prepared in step (1) in a drying oven at a constant temperature of 8...

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Abstract

The invention discloses a sol gel preparation method of barium strontium titanate (BST), which takes cheap inorganic matter including TiO2, Ba(NO3)2, Sr (NO3)2 and the like as raw materials. The formula of a ceramic component is Ba0.5Sr0.5TiO3. The sol gel preparation method comprises the specific steps: (1) preparing BST precursor sol; (2) preparing ceramic by using BST ceramic powder. The barium strontium titanate powder prepared by the sol gel preparation method has a high crystallization degree and a uniform crystal grain size; the size of crystal grains reaches to a nano grade which is about 30nm to 40nm. When the prepared Ba0.5Sr0.5TiO3 ceramic is subjected to heat preservation for 2 hours at a sintering temperature of 1250 DEG C, and the density is up to be 95% of theoretical density; compared with a traditional solid-phase preparation method, the method has the advantages that the sintering temperature of the product is reduced and the product has good dielectric properties: under the frequency of 1KHz, a room-temperature dielectric constant epsilon is equal to 930 and the dielectric loss tan delta is equal to 0.08.

Description

technical field [0001] The invention relates to the technical field of dielectric ceramic materials, specifically TiO 2 , Ba(NO 3 ) 2 , Sr(NO 3 ) 2 A method in which barium strontium titanate powder is prepared by sol-gel method using cheap inorganic materials as raw materials, and then barium strontium titanate ceramics are prepared by sintering. Background technique [0002] Barium strontium titanate (BST for short) is an infinite solid solution structure formed by barium titanate and strontium titanate, since both barium titanate and strontium titanate are typical ABO 3 Perovskite structure, so the BST they form is also a typical perovskite structure, and through the analysis of its unit cell, it is found that in the specific crystal structure of barium strontium titanate, Ba atoms and Sr atoms are randomly distributed in the A position of the unit cell . In [TiO 6 ] In the framework composed of octahedrons, the Ba atoms or Sr atoms are in the interstices of the un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465
Inventor 赵丽萍陶文宏付兴华程国园马闻辛
Owner UNIV OF JINAN
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