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Barium strontium titanate-based superfine powder and preparation method thereof

A technology of strontium barium titanate and base powder, which is applied in the field of preparation of strontium barium titanate based ultrafine powder for ceramic capacitor materials, which can solve the problems of easy agglomeration of powder, reduction of uniformity of powder raw materials, and increase in particle size, etc. question

Inactive Publication Date: 2010-12-22
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, one of the disadvantages of the ultrafine powder prepared by the chemical co-precipitation method is that the powder is easy to agglomerate, and the powder agglomeration may occur in each process step of preparing the powder, such as the co-precipitation process, the later water bath treatment process, and drying and dehydration. during calcination
This will affect the uniformity of the microstructure of the ceramic body obtained by powder sintering and the compactness of the ceramic body, thereby directly affecting the electrical properties of the ceramic capacitor material, and the agglomeration of the powder will reduce the uniformity of the powder raw material and the particle size It also has an adverse effect on reducing the sintering temperature of the ceramic body

Method used

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  • Barium strontium titanate-based superfine powder and preparation method thereof
  • Barium strontium titanate-based superfine powder and preparation method thereof
  • Barium strontium titanate-based superfine powder and preparation method thereof

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Embodiment 1

[0023] The experimental flow chart is as figure 1 shown. Press Ba 0.80 Sr 0.20 TiO 3 The stoichiometric ratio of Ba(NO 3 ) 2 , Sr(NO 3 ) 2 62.7216g, 12.1978g, added to deionized water, stirred vigorously and heated to 50°C to dissolve, added ammonia water to adjust the pH value to 2.0, and obtained a strontium barium salt solution with a concentration of 0.10mol / L. 20.0g NH 4 NO 3 Dissolve in 500ml deionized water with HNO 3 Adjust the pH value to 2.0, add 0.5wt% polyethylene glycol (PEG) as a dispersant, and prepare a 0.5mol / L ammonium nitrate buffer solution. Weigh 63.0280g of oxalic acid, 350ml each of absolute ethanol and deionized water, stir until dissolved, and prepare an oxalic acid solution with a concentration of 1.0mol / L. Add 102ml of butyl titanate to 500ml of absolute ethanol to prepare a 0.5mol / L butyl titanate ethanol solution, and stir evenly with a high-speed mixer. The prepared oxalic acid solution was added to the butyl titanate ethanol solution ...

Embodiment 2

[0026] The specific process is as example 1, the difference is that in the BST powder preparation process, according to Ba 0.60 Sr 0.40 TiO 3 The stoichiometric ratio of Ba(NO 3 ) 2 , Sr(NO 3 ) 2 They are 47.0412g and 25.3956g respectively, and after being dissolved in deionized water, ammonia water is added to adjust the pH value to 2.5 to obtain a strontium barium salt solution with a concentration of 0.20mol / L. 24.0g NH 4 NO 3 Dissolve in 500ml deionized water with HNO 3 The pH value was adjusted to 3.0, and 1.0 wt % polyethylene glycol (PEG) was added as a dispersant to prepare a 0.60 mol / L ammonium nitrate buffer solution. Weigh 75.6336g of oxalic acid, 350ml each of absolute ethanol and deionized water, stir until dissolved, and prepare an oxalic acid solution with a concentration of 1.2mol / L. Add 153ml of butyl titanate to 500ml of absolute ethanol to prepare a 0.70mol / L butyl titanate ethanol solution. Other processes in the middle are the same as Example 1. ...

Embodiment 3

[0028] The specific process is as example 1, the difference is that in the BST powder preparation process, according to Ba 0.20 Sr 0.80 TiO 3 The stoichiometric ratio of Ba(NO 3 ) 2 , Sr(NO 3 ) 2 They were 15.6804g and 50.7912g respectively, dissolved in deionized water and then added ammonia water to adjust the pH value to 3.0 to obtain a strontium barium calcium salt solution with a concentration of 0.30mol / L. 26.0g NH 4 NO 3 Dissolve in 500ml deionized water with HNO 3 Adjust the pH value to 3.5, add 1.5 wt% alkyl glycoside (APG) as a dispersant, and prepare a 0.65 mol / L ammonium nitrate buffer solution. Weigh 94.5420g of oxalic acid, 350ml each of absolute ethanol and deionized water, stir until dissolved, and prepare an oxalic acid solution with a concentration of 1.5mol / L. 187ml of butyl titanate was added to 500ml of absolute ethanol to prepare a 0.80mol / L butyl titanate ethanol solution. Other processes in the middle are the same as Example 1. After the titr...

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Abstract

The invention relates to barium strontium titanate-based superfine powder and a preparation method thereof. The powder is Ba1-xSrxTiO3, wherein x=0.2-0.8; or the powder is Ca2+ doped Ba1-z-ySrxCayTiO3, wherein z=0.2-0.7 and y=0-0.2. The method comprises the following steps of: preparing salt solution, buffer solution of ammonium nitrate, oxalic acid solution, ethanol solution of titanium butoxide and acid solution of titanyl oxalate monohydrate; performing coprecipitation reaction; and ageing, drying and calcining to obtain barium strontium calcium titanate powder. The barium strontium titanate-based superfine powder with the advantages of a little agglomeration, high dispersability, and high chemical activity is prepared by the chemical copercipitation method, accords with a stoichiometric ratio, has the advantages of small grain size, high uniformity, a little agglomeration, large specific surface area, and high chemical activity, and contributes to the compactness and sintering performance of the prepared ceramic capacitor materials.

Description

technical field [0001] The invention belongs to the field of electronic materials, and relates to a method for preparing strontium barium titanate-based ultrafine powder for manufacturing ceramic capacitor materials. Background technique [0002] Barium strontium titanate (BST)-based ferroelectric materials are widely used in the field of electronic ceramics due to their high dielectric properties and continuously adjustable dielectric constant-temperature characteristics, especially in the field of microwave devices. prospect. In recent years, in addition to various doping modifications on barium strontium titanate in the field of scientific research, the research on the optimization of its powder properties and the improvement of sintering process has also been extensive and in-depth. Among them, the performance of powder is the most important factor affecting the performance of ceramic body. The refinement of powder has a fundamental and significant effect on improving t...

Claims

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Application Information

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IPC IPC(8): C04B35/468C04B35/47
Inventor 季惠明李晓雷刘珊贾倩倩邢永慧梁辉
Owner TIANJIN UNIV
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