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Synthesis of solvent heat method nano strontium titanate powder

A nano-strontium titanate and powder technology is applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., to achieve the effects of reducing equipment requirements, simple process, and cheap reaction raw materials

Inactive Publication Date: 2008-06-04
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvothermal method can change the thermodynamic properties of the system and the grain morphology in the hydrothermal system. Moreover, there is no report on the one-step synthesis of strontium titanate by solvothermal method under normal pressure using metatitanic acid as raw material.

Method used

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  • Synthesis of solvent heat method nano strontium titanate powder
  • Synthesis of solvent heat method nano strontium titanate powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A three-necked flask of 50 ml is fixed on a heat-collecting constant temperature magnetic stirrer, and a condenser, a thermometer, and a constant-pressure dropping funnel are installed on the three-necked flask. Under normal pressure, put 0.08mol of strontium chloride and 25ml of ethanol into a three-necked flask for mixing and stirring at 60°C, adjust the pH to 8 with ammonia water to obtain suspension A, and beat 0.1mol of metatitanic acid in 15ml of ethanol to obtain a suspension For turbid solution B, inject B into a constant pressure dropping funnel, slowly drop into suspension A, and heat the oil bath with magnetic stirring. Timed reaction 4h.

[0021] After the reaction is finished, the reaction liquid is filtered and processed to obtain the product. The titanium-strontium ratio of the product was 1.12 by chemical analysis. XRD analysis product is cubic phase. According to Scherrer's formula, the average primary particle diameter of strontium titanate was calc...

Embodiment 2

[0023] A three-necked flask of 50 ml is fixed on a heat-collecting constant temperature magnetic stirrer, and a condenser, a thermometer, and a constant-pressure dropping funnel are installed on the three-necked flask. Under normal pressure, put 0.1mol of strontium chloride and 15ml of distilled water into a three-necked flask for mixing and stirring at 90°C, adjust the pH to 10 with potassium hydroxide to obtain suspension A; beat 0.1mol of metatitanic acid in 15ml of water, Obtain suspension B; inject B into a constant pressure dropping funnel, slowly drop into suspension A, and heat with magnetic stirring in an oil bath. Time the reaction for 1 h.

[0024] After the reaction is finished, the reaction liquid is filtered and processed to obtain the product. The titanium-strontium ratio of the product was found to be 1.03 by chemical analysis. XRD analysis product is cubic phase. According to Scherrer's formula, the average primary particle diameter of strontium titanate is...

Embodiment 3

[0026] A three-necked flask of 100 ml is fixed on a heat-collecting constant temperature magnetic stirrer, and a condenser tube, a thermometer, and a constant-pressure dropping funnel are installed on the three-necked flask. Under normal pressure, put 0.1mol of metatitanic acid and 40ml of propanol into a three-necked flask for slurry at 80°C to obtain a suspension A; mix and stir 0.12mol of strontium nitrate and 15ml of distilled water, adjust the pH to 10 with sodium hydroxide, Suspension B was obtained. Pour B into the constant pressure dropping funnel, slowly drop into the suspension A, and heat the oil bath with magnetic stirring. Timed reaction 6h.

[0027] After the reaction is finished, the reaction liquid is filtered and processed to obtain the product. The titanium-strontium ratio of the product was found to be 0.98 by chemical analysis. XRD analysis product is cubic phase. According to Scherrer's formula, the average primary particle diameter of strontium titana...

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Abstract

The present invention discloses a kind of fast, simple and cheap method of preparing strontium titanate. At normal pressure, metatitanic acid, soluble strontium salt, alkali and solvent are mixed and reacted for certain time to obtain precipitate; and the precipitate is dried to obtain high purity superfine nanometer strontium titanate powder. The obtained strontium titanate powder has high purity, completely developed crystal grain and small granularity, and can meet the requirement for use in electronic ceramic field. Compared with other synthesis paths, the present invention has the advantages of cheap material, mild reaction condition, relaxed requirement in apparatus, simple technological process, etc.

Description

technical field [0001] The invention relates to a method for synthesizing strontium titanate powder in one step by solvothermal method. Furthermore, it relates to a method for synthesizing strontium titanate powder in one step by solvothermal method using metatitanic acid as a raw material under normal pressure. Background of the invention [0002] Strontium titanate has good dielectric properties, excellent semiconductor properties, high voltage resistance, and better temperature stability, and is widely used in the field of electronic ceramics industry. With the rapid development of science and technology, the requirements of high precision, high reliability, multi-function and miniaturization are put forward for electronic ceramic components. The key to meet the above requirements is to prepare high-purity, ultra-fine strontium titanate powder raw materials. [0003] At present, the industrial production methods of strontium titanate are mainly solid-phase sintering meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/47C04B35/626C01G23/00
Inventor 王公应冯秀丽王越曾毅
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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