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Method for synthesizing Bi0.5Na0.5TiO3 spheroidal particles by microwave hydrothermal method

A microwave hydrothermal method and spherical particle technology are applied in the preparation field of microwave hydrothermal synthesis of BNT single-diameter spherical particles, which can solve problems such as steps of increasing cost and purification, and reaction time restricting industrial production, etc. The effect of reduced production cost and simple process

Inactive Publication Date: 2009-09-09
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the addition of too high amount of alkali has high requirements on the synthesis equipment, which increases the cost of synthesis and the steps of purification, and the long reaction time also limits its industrial production

Method used

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  • Method for synthesizing Bi0.5Na0.5TiO3 spheroidal particles by microwave hydrothermal method
  • Method for synthesizing Bi0.5Na0.5TiO3 spheroidal particles by microwave hydrothermal method
  • Method for synthesizing Bi0.5Na0.5TiO3 spheroidal particles by microwave hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 3.359g Bi(BO 3 ) 3 ·5H 2 O was dissolved in 50 mL of deionized water, and then 3.5 mL of Ti(OC 4 h 9 ) 4 , stirring to form a mixed solution (solution A), control [Ti 4+ ] / [Bi 3+ ] The molar ratio is 1.5. Weigh 16.0106g NaOH and dissolve in 50mL deionized water (solution B). Drop solution B into solution A drop by drop, stir to form a uniform mixed solution (solution C), and control [OH] in the solution after the reaction - ]=5M. Measure 10 mL of solution C into a reaction vessel, put it into a microwave hydrothermal system (PIEMEX) for microwave heating; control the synthesis temperature to 190° C., and the reaction time to 2 h. After the reaction, the precipitate was filtered and washed with deionized water until neutral. Put the precipitate into an oven and dry it at 80°C to obtain a spherical ultrafine BNT powder with a single particle size.

[0023] Take a little BNT powder and place it in 30ml ethanol, and ultrasonically disperse it in an ultrason...

Embodiment 2

[0026] Weigh 2.5192g Bi(BO 3 ) 3 ·5H 2 O was dissolved in 50 mL of deionized water, and then 3.5 mL of Ti(OC 4 h 9 ) 4 , stirring to form a mixed solution (solution A), control [Ti 4+ ] / [Bi 3+ ] The molar ratio is 2. Weigh 6.7375g NaOH and dissolve in 50mL deionized water (Solution B). Drop solution B into solution A drop by drop, stir to form a uniform mixed solution (solution C), and control [OH] in the solution after the reaction - ]=1M. Measure 10 mL of solution C into a reaction vessel, and put it into a microwave hydrothermal system for microwave heating. The synthesis temperature was controlled to be 140° C., and the reaction time was 6 h.

[0027] Other steps are the same as described in Example 1. The SEI of the obtained BNT powder is as follows image 3 shown.

Embodiment 3

[0029] Weigh 2.675g Bi(BO 3 ) 3 ·5H 2 O was dissolved in 50 mL of deionized water, and 1.2 mL of TiCl was added dropwise into it 4 , stirring to form a mixed solution (solution A), control [Ti 4+ ] / [Bi 3+ ] The molar ratio is 2. Weigh 6.8964g NaOH and dissolve in 50mL deionized water (Solution B). Drop solution B into solution A drop by drop, stir to form a uniform mixed solution (solution C), and control [OH] in the solution after the reaction- ]=1M. Measure 10 mL of solution C into a reaction vessel, and put it into a microwave hydrothermal system for microwave heating. The synthesis temperature was controlled at 190° C., and the reaction time was 2 h.

[0030] Other steps are the same as described in Example 1. The SEI of the obtained BNT powder is as follows Figure 4 shown.

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Abstract

The invention relates to a method for synthesizing Bi0.5Na0.5TiO3 spheroidal particles by a microwave hydrothermal method. The method for synthesizing Bi0.5Na0.5TiO3 spheroidal particles comprises the following concrete steps: firstly, preparing bismuth nitrate solution; then, dripping titanium-containing compound solution into the bismuth nitrate solution to form uniform mixed solution; gradually dripping NaOH water-solubility solution into the uniform mixed solution and controlling the molar concentration of the OH<-> of the mixed solution between 1M and 5M; carrying out heating reaction for the mixing solution in a microwave heating way and controlling the temperature of the heating reaction between 140 DEG C and 190 DEG C and the reaction time of the heating reaction between 2 hours and 6 hours; and obtaining the Bi0.5Na0.5TiO3 spheroidal particles by filtering, washing to be neutral and drying after the heating reaction is finished. The production method has simple process, uses no organic solvent or organic reactant, has short reaction time and is suitable for industrialized production. The particle size distribution of the synthesized Bi0.5Na0.5TiO3 spheroidal particles is narrow, thus the invention meets the requirement of high reliability, multifunction and micromation proposed for electronic ceramic components.

Description

technical field [0001] The present invention relates to a kind of sodium bismuth titanate (Bi 0.5 Na 0.5 TiO 3 , BNT) preparation method, in particular to a preparation method for microwave hydrothermal synthesis of BNT single-diameter spherical particles, the method can synthesize BNT single-diameter spherical particles that meet the requirements of piezoelectric ceramic components. Background technique [0002] Piezoelectric ceramic materials are widely used in high-tech fields such as electronic information, integrated circuits, computers, automatic control, aerospace, marine surveying and mapping, communication technology, automobiles and energy, and become the basic materials for many new electronic components. It occupies a very important strategic position in the construction. Traditional piezoelectric ceramics include PZT-based binary and multi-component ceramic materials and have a wide range of applications, but in PZT-based piezoelectric ceramics, the content o...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/64C04B35/475
Inventor 吕忆农刘云飞戴沈华施书哲
Owner NANJING UNIV OF TECH
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