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Method for preparing nano strontium titanate by lactic acid adjuvant process

A nano-strontium titanate and lactic acid technology, applied in chemical instruments and methods, crystal growth, self-gel state and other directions, can solve the problems of combustion and explosion, less strontium titanate, etc. high rate effect

Inactive Publication Date: 2008-02-06
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the strontium nitrate raw material has the danger of burning and explosion, and will produce NO, NO in the subsequent sintering 2 and other harmful gases
[0004] There are few methods for preparing strontium titanate in foreign countries, and there is no process for preparing nano-strontium titanate by sol-gel method.

Method used

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  • Method for preparing nano strontium titanate by lactic acid adjuvant process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 0.1 mol of strontium carbonate and dissolve it in 0.8 mol of lactic acid, add 10 ml of deionized water, stir on a magnetic constant temperature stirrer at 80°C for 3 hours until uniform and transparent, and obtain solution A. Then weigh 0.1 mol of butyl titanate, slowly drop it into solution A, and stir at a speed of 200 rpm. After mixing, continue stirring for 30 minutes to obtain a uniform and transparent sol. Nitric acid and ammonia water were added to adjust the pH of the sol to 5. The sol was placed in an oven at 50°C for 23 hours to obtain a uniform and transparent gel. The gel was dried under vacuum at 120° C. for 11 hours to obtain the gel, and the dried gel was ground and then heat-treated at 600° C. and then ground to obtain strontium titanate nanopowder.

Embodiment 2

[0029] Weigh 0.15 mol of strontium carbonate and dissolve it in 1.2 mol of lactic acid, add 30 ml of deionized water, and stir on a magnetic constant temperature stirrer at 90°C for 3 hours until uniform and transparent to obtain solution A. Then weigh 0.15 mol of butyl titanate, slowly add it dropwise into solution A, and stir at a speed of 250 rpm. After mixing, continue stirring for 45 minutes to obtain a uniform and transparent sol. Nitric acid and ammonia water were added to adjust the pH of the sol to 4. The sol was placed in an oven at 70°C for 24 hours to obtain a uniform and transparent gel. The gel was vacuum-dried at 130° C. for 10 hours to obtain a xerogel, and the xerogel was ground and then heat-treated at 700° C. and then ground to obtain strontium titanate nanopowder.

Embodiment 3

[0031] Weigh 0.2 mol of strontium carbonate and dissolve it in 1.4 mol of lactic acid, add 50 ml of deionized water, and stir on a magnetic constant temperature stirrer at 70°C for 3 hours until uniform and transparent to obtain solution A. Then weigh 0.2 mol of butyl titanate, slowly add it dropwise into solution A, and stir at a speed of 300 rpm. After mixing, continue stirring for 30 minutes to obtain a uniform and transparent sol. Nitric acid and ammonia water were added to adjust the pH of the sol to 4. The sol was placed in an oven at 60°C for 23 hours to obtain a uniform and transparent gel. The gel was vacuum-dried at 120° C. for 11 hours to obtain a xerogel, and the xerogel was ground and then heat-treated at 600° C. and then ground to obtain strontium titanate nanopowder.

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Abstract

The invention relates to a preparation method of nanometer strontium titanate with lactic acid aid. The invention takes strontium salt and butyl titanate as materials, lactic acid as solvent and inhibitor, and takes a small amount of water to promote hydrolyzing. The procedures of the invention are as follows: Firstly, strontium titanate is dissolved in the lactic acid, and then is added with the solvent of the butyl titanate slowly with violent stirring, and is kept still, thus homogeneous and transparent gel is obtained. The gel is calcineed at a high temperature, thus nanometer strontium titanate power is obtained. The composition components of the invention are less, can be got easily and are environment friendly without pollution. The lactic acid acts as the solvent of the strontium salt and as the inhibitor of the butyl titanate, and can well control the sol-gel process; therefore, the productive rate of the nanometer strontium titanate power prepared by the method is increased. The invention needs only 80 ml of gel for to make 0.1 mol of SrTiO3r. The proposal has a wide application and is suitable for the preparations of nanometer barium titanate and nanometer barium strontium titanate, etc.

Description

technical field [0001] The invention relates to a preparation method of nano strontium titanate powder. Specifically, a sol-gel preparation method using lactic acid as a solvent and an inhibitor. Background technique [0002] Strontium titanate (SrTiO 3 ) has a typical ABO 3 Perovskite (ABO 3 ) structure, is an important electronic ceramic material, which has the advantages of high dielectric constant, low dielectric loss, and good temperature stability. It is widely used in high voltage capacitors, grain boundary layer capacitors, varistor ceramics, heat sensitive components and other fields. The prospects are very bright. At present, with the improvement of the performance requirements of fine functional materials in the electronics industry, the requirements for the performance of strontium titanate powders are becoming more and more stringent. control etc. The research on nano-strontium titanate materials has been very active. Many researchers have successfully pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624C04B35/47C30B29/32C30B5/00
Inventor 刘斌王峰李鸿岩陈维陈寿田刘冠芳
Owner XI AN JIAOTONG UNIV
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