Method for preparing strontium sodium bismuth titanate piezoelectric ceramic by sol-gel auto-igniting process

A technology of sodium bismuth titanate and piezoelectric ceramics, which is applied in the field of low temperature preparation, can solve the problems that piezoelectric properties cannot be fully exhibited, it is difficult to sinter samples of dense microcrystalline structure, and the coercive field strength of sodium bismuth titanate is high. High repeatability, good piezoelectric performance, stable process effect

Active Publication Date: 2014-04-23
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sodium bismuth titanate has a high coercive field strength at room temperature and high conductivity in the ferroelectric phase region; and it is difficult to sinter a sample with a dense microcrystalline structure, which makes it very difficult to polarize the material, and its piezoelectric properties cannot fully expressed, it is difficult to be practical

Method used

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  • Method for preparing strontium sodium bismuth titanate piezoelectric ceramic by sol-gel auto-igniting process
  • Method for preparing strontium sodium bismuth titanate piezoelectric ceramic by sol-gel auto-igniting process

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Experimental program
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Effect test

Embodiment 1

[0025] 1) According to stoichiometric ratio 0.76Na 0.5 Bi 0.5 TiO 3 -0.24SrTiO 3 Weigh bismuth nitrate, sodium nitrate and strontium nitrate to prepare a nitrate aqueous solution with a nitrate ion concentration of 1mol / L, add citric acid and ethylenediaminetetraacetic acid (the moles of citric acid and ethylenediaminetetraacetic acid) to the nitrate aqueous solution ratio of 1:1) as a complexing agent to obtain mixture A, wherein the molar ratio of complexing agent to nitrate ion is 1.25:1;

[0026] 2) Dissolve the butyl titanate weighed according to the stoichiometric ratio in ethanol to obtain an ethanol solution of butyl titanate, add glacial acetic acid to the ethanol solution of butyl titanate to obtain a mixture B, and the mass fraction of glacial acetic acid in the mixture B is 1%, mixture B is added in mixture A to obtain mixture C;

[0027] 3) Add the dispersant ethylene glycol ether to the mixture C to obtain the mixture D, the mass fraction of the dispersant in...

Embodiment 2

[0033] 1) According to stoichiometric ratio 0.74Na 0.5 Bi 0.5 TiO 3 -0.26SrTiO 3 Weigh bismuth acetate, sodium acetate and strontium acetate to prepare an acetate solution with an acetate ion concentration of 1mol / L, add citric acid and ethylenediaminetetraacetic acid (citric acid and ethylenediaminetetraacetic acid) to the acetate solution The molar ratio is 1:1) mixture as complexing agent to obtain mixture A, wherein the molar ratio of complexing agent and acetate ion is 1:1;

[0034] 2) Dissolve the butyl titanate weighed according to the stoichiometric ratio in ethanol to obtain an ethanol solution of butyl titanate, add glacial acetic acid to the ethanol solution of butyl titanate to obtain a mixture B, and the mass fraction of glacial acetic acid in the mixture B is 1%, mixture B is added in mixture A to obtain mixture C;

[0035] 3) Add dispersant polyacrylic acid to mixture C to obtain mixture D, the mass fraction of dispersant in mixture D is 5%, adjust the pH va...

Embodiment 3

[0041] 1) According to stoichiometric ratio 0.72Na 0.5 Bi 0.5 TiO 3 -0.28SrTiO 3 Weigh bismuth carbonate, sodium carbonate and strontium carbonate to prepare an aqueous carbonate solution with a carbonate ion concentration of 1mol / L, add citric acid and ethylenediaminetetraacetic acid (citric acid and ethylenediaminetetraacetic acid) to the aqueous carbonate solution The molar ratio is 1:1) mixture as complexing agent to obtain mixture A, wherein the molar ratio of complexing agent to carbonate ion is 1.5:1;

[0042]2) Dissolve the butyl titanate weighed according to the stoichiometric ratio in ethanol to obtain an ethanol solution of butyl titanate, add glacial acetic acid to the ethanol solution of butyl titanate to obtain a mixture B, and the mass fraction of glacial acetic acid in the mixture B is 1%, mixture B is added in mixture A to obtain mixture C;

[0043] 3) Add dispersant polyvinyl alcohol to mixture C to obtain mixture D, the mass fraction of dispersant in mix...

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Abstract

The invention discloses a method for preparing strontium sodium bismuth titanate piezoelectric ceramic by a sol-gel auto-igniting process. The method comprises the steps of: by using a complexing agent, nitric acid, acetic acid or carbonate and butyl titanate as raw materials, adjusting pH value by adopting ammonium hydroxide, carrying out complexing hydrolysis reaction in water and alcohol solution, performing microwave heating for dehydration condensation to obtain xerogel, and heating the xerogel at 500 DEG C to perform auto-igniting reaction to obtain strontium sodium bismuth titanate ceramic powder with narrow particle size (10-40nm). The ceramic can be densely sintered at 980-1020 DEG C due to nanometer small-size effect and can keep good piezoelectric property, the equipment required by the method is simple and has no special environment requirement, the process is stable at normal temperature, the repeatability is strong, the synthesized powder has high purity and the heat treatment temperature is low, therefore, the ceramic can be widely applied to the fields such as piezoelectric vibrators, micro positioners, ultrasonic transducers and the like.

Description

technical field [0001] The invention relates to a low-temperature preparation method of inorganic functional materials, in particular to a low-temperature synthesis method of sol-gel self-propagating combustion of bismuth titanate, sodium strontium lead-free piezoelectric ceramics. Background technique [0002] Piezoelectric ceramics are the most widely used and mature category of piezoelectric materials. However, in the field of piezoelectric ceramics, lead zirconate titanate has dominated for a long time, and the toxic lead oxide (or lead tetraoxide) in lead zirconate titanate ceramics accounts for about 70% of the total raw materials. Such a high lead The content will bring harm to the environment and human beings in the process of preparation, use and recycling. Bismuth sodium titanate series materials with perovskite structure have excellent characteristics such as large anisotropy of electromechanical coupling coefficient, high Curie temperature, small relative permit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/624C04B35/64
Inventor 杜慧玲杜娴史翔和娇娇姚淼
Owner XIAN UNIV OF SCI & TECH
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