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Method of preparing potassium sodium niobate-sodium bismuth titanate unleaded piezoelectric composite thick film with KNN powder in different particle diameters

A technology of potassium sodium niobate and sodium bismuth titanate, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, etc., can solve the problems of low phase transition temperature, high coercive field, and difficulty in preparing compactness. , to achieve the effect of reducing the sintering temperature and improving the piezoelectric performance

Inactive Publication Date: 2015-04-29
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, potassium sodium niobate (molecular formula K 0.5 Na 0.5 NbO 3 , referred to as KNN) based piezoelectric ceramics has attracted much attention because of its high piezoelectricity and high Curie temperature, but it is difficult to prepare pure potassium sodium niobate ceramic body with good density by using traditional ceramic sintering process
Sodium bismuth titanate (Bi 0.5 Na 0.5 TiO 3 , referred to as BNT) has also received attention because of its strong ferroelectricity at room temperature, but pure bismuth sodium titanate piezoelectric ceramics have the disadvantages of high coercive field and low phase transition temperature, which affect its practical application.

Method used

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  • Method of preparing potassium sodium niobate-sodium bismuth titanate unleaded piezoelectric composite thick film with KNN powder in different particle diameters
  • Method of preparing potassium sodium niobate-sodium bismuth titanate unleaded piezoelectric composite thick film with KNN powder in different particle diameters
  • Method of preparing potassium sodium niobate-sodium bismuth titanate unleaded piezoelectric composite thick film with KNN powder in different particle diameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1) Preparation of sodium bismuth titanate precursor sol:

[0054] 1.1) Dissolve bismuth nitrate pentahydrate in ethylene glycol methyl ether, stir at room temperature for 30 minutes until uniform, and obtain a ethylene glycol methyl ether solution of bismuth nitrate;

[0055] 1.2) Dissolve anhydrous sodium acetate in ethylene glycol methyl ether, add dropwise glacial acetic acid as a catalyst at the same time, stir at room temperature for 30 minutes until uniform, and obtain a sodium acetate solution;

[0056] 1.3) Dissolve tetra-n-butyl titanate and acetylacetone in ethylene glycol methyl ether, stir magnetically at room temperature for 40 minutes until uniform, and obtain a mixed solution of tetra-n-butyl titanate; among them, tetra-n-butyl titanate and acetylacetone The molar ratio is 1:2;

[0057] 1.4) According to Bi 0.5 Na 0.5 TiO 3 The stoichiometric ratio of bismuth nitrate in ethylene glycol methyl ether solution, sodium acetate solution and tetra-n-butyl t...

Embodiment 2

[0065] 1) Preparation of sodium bismuth titanate precursor sol:

[0066] 1.1) Dissolve bismuth nitrate pentahydrate in ethylene glycol methyl ether, stir at room temperature for 30 minutes until uniform, and obtain a ethylene glycol methyl ether solution of bismuth nitrate;

[0067] 1.2) Dissolve anhydrous sodium acetate in ethylene glycol methyl ether, add dropwise glacial acetic acid as a catalyst at the same time, stir at room temperature for 30 minutes until uniform, and obtain a sodium acetate solution;

[0068] 1.3) Dissolve tetra-n-butyl titanate and acetylacetone in ethylene glycol methyl ether, stir magnetically at room temperature for 40 minutes until uniform, and obtain a mixed solution of tetra-n-butyl titanate; among them, tetra-n-butyl titanate and acetylacetone The molar ratio is 1:2;

[0069] 1.4) According to Bi 0.5 Na 0.5 TiO 3 The stoichiometric ratio of bismuth nitrate in ethylene glycol methyl ether solution, sodium acetate solution and tetra-n-butyl t...

Embodiment 3

[0077] 1) Preparation of sodium bismuth titanate precursor sol:

[0078] 1.1) Dissolve bismuth nitrate pentahydrate in ethylene glycol methyl ether, stir at room temperature for 30 minutes until uniform, and obtain a ethylene glycol methyl ether solution of bismuth nitrate;

[0079] 1.2) Dissolve anhydrous sodium acetate in ethylene glycol methyl ether, add dropwise glacial acetic acid as a catalyst at the same time, stir at room temperature for 30 minutes until uniform, and obtain a sodium acetate solution;

[0080] 1.3) Dissolve tetra-n-butyl titanate and acetylacetone in ethylene glycol methyl ether, stir magnetically at room temperature for 40 minutes until uniform, and obtain a mixed solution of tetra-n-butyl titanate; among them, tetra-n-butyl titanate and acetylacetone The molar ratio is 1:2;

[0081] 1.4) According to Bi 0.5 Na 0.5TiO 3 The stoichiometric ratio of bismuth nitrate in ethylene glycol methyl ether solution, sodium acetate solution and tetra-n-butyl ti...

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Abstract

The invention relates to a method of preparing a potassium sodium niobate-sodium bismuth titanate (KNN-BNT) unleaded piezoelectric composite thick film with KNN (potassium sodium niobate) powder in different particle diameters. The method comprises the steps of stirring an ethylene glycol monomethyl ether solution, a sodium acetate solution and a tetra-n-butyl titanate mixed solution of bismuth nitrate at 80-100 DEG C, cooling to a room temperature, obtaining sodium bismuth titanate precursor sol, uniformly ball-milling potassium carbonate, sodium carbonate and niobium pentoxide, drying, tableting, sintering into a potassium sodium niobate green body, ball-milling the potassium sodium niobate green body, obtaining the potassium sodium niobate powder, mixing the potassium sodium niobate powder with the sodium bismuth titanate precursor sol, adding polyvinylpyrrolidone, uniformly ball-milling, stirring, obtaining stable mixed slurry, repeating a spin-coating process and a heat treatment process, and obtaining the KNN-BNT unleaded piezoelectric composite thick film with a pure perovskite phase structure. The method can reduce a sintering temperature of the thick film effectively, reduce volatilization of sodium and bismuth, and improve dielectric, ferroelectric, and piezoelectric properties of the thick film.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and relates to a method for preparing piezoelectric composite thick films, in particular to a method for preparing potassium sodium niobate-sodium bismuth titanate lead-free piezoelectric composite thick films by using KNN powders with different particle sizes. Background technique [0002] In view of the harm to the environment and human health caused by lead-containing materials in the process of preparation, use and disposal, research on lead-free materials has gradually become the main research and development direction in the field of materials. At present, potassium sodium niobate (molecular formula K 0.5 Na 0.5 NbO 3 , referred to as KNN) based piezoelectric ceramics has attracted much attention because of its high piezoelectricity and high Curie temperature, but it is difficult to prepare pure potassium sodium niobate ceramic body with good density by using traditional ceramic sinteri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/37H01L41/43H10N30/092H10N30/097
Inventor 任巍纪红芬史鹏吴小清王玲艳赵金燕
Owner XI AN JIAOTONG UNIV