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Process for preparing flaky potassium-sodium niobate powders

A technology of potassium sodium niobate and flakes, which is applied in the field of preparation of flake potassium sodium niobate powder, can solve the problems of restricting the performance of KNN-based lead-free piezoelectric ceramics, slow research progress, and structural complexity, etc., to achieve convenient The effect of promotion and application, wide source of raw materials, and easy operation

Inactive Publication Date: 2012-09-12
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the use of flake NaNbO 3 or KNbO 3 The template is a heterogeneous template with a different composition from the KNN base material, which greatly restricts the further improvement of the performance of KNN-based lead-free piezoelectric ceramics
However, the preparation of sheet-like isotropic KNN templates, due to the complexity of its own structure and other reasons, has made slow progress in this area in recent years.

Method used

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  • Process for preparing flaky potassium-sodium niobate powders
  • Process for preparing flaky potassium-sodium niobate powders
  • Process for preparing flaky potassium-sodium niobate powders

Examples

Experimental program
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Embodiment 1

[0017] The preparation method of present embodiment flake potassium sodium niobate powder, its steps are as follows:

[0018] in flake K 4 Nb 6 o 17 , and K 2 CO 3 , KCl, NaCl are reactants, where K 2 CO 3 , KCl, NaCl are ball-milled and dried in advance and passed through a 60-mesh sieve, according to the molar ratio K 4 Nb 6 o 17 : K 2 CO 3 =1:1, KCl:NaCl=2:1, according to mass ratio {K 2 CO 3 +K 4 Nb 6 o 17}:{KCl+NaCl}=1:11; the above-mentioned reactants were stirred and mixed evenly with a magnetic stirrer in an anhydrous ethanol medium, and the powder obtained by drying the mixed solution was placed in a muffle furnace for molten salt reaction, at a rate of 7°C / min to 1050°C, the holding time is 0min; the powder obtained after the molten salt reaction is washed with deionized water to remove the remaining soluble salt, and dried to obtain potassium sodium niobate powder with a flake shape body. According to the energy spectrum test, the molar ratio of K a...

Embodiment 2

[0020] The preparation method of present embodiment flake potassium sodium niobate powder, its steps are as follows:

[0021] in flake K 4 Nb 6 o 17 , and K 2 CO 3 , KCl, NaCl are reactants, where K 2 CO 3 , KCl, NaCl are ball-milled and dried in advance and passed through a 60-mesh sieve, according to the molar ratio K 4 Nb 6 o 17 : K 2 CO 3 =1:1.2, KCl:NaCl=2:1, according to mass ratio {K 2 CO 3 +K 4 Nb 6 o 17}:{KCl+NaCl}=1:1.2; the above-mentioned reactants were stirred and mixed uniformly with a magnetic stirrer in an anhydrous ethanol medium, and the powder obtained by drying the mixed solution was placed in a muffle furnace for molten salt reaction. 3°C / min to 1000°C, the holding time is 0min; the powder obtained after the molten salt reaction is washed with deionized water to remove the remaining soluble salt, and dried to obtain potassium sodium niobate powder with a flake shape body. According to the energy spectrum test, the molar ratio of K and Na i...

Embodiment 3

[0023] The preparation method of present embodiment flake potassium sodium niobate powder, its steps are as follows:

[0024] in flake K 4 Nb 6 o 17 , and K 2 CO 3 , KCl, NaCl are reactants, where K 2 CO 3 , KCl, NaCl are ball-milled and dried in advance and passed through a 60-mesh sieve, according to the molar ratio K 4 Nb 6 o 17 : K 2 CO 3 =1:1, KCl:NaCl=4:1, according to mass ratio {K 2 CO 3 +K 4 Nb 6 o 17}:{KCl+NaCl}=1:1.1; the above-mentioned reactants were stirred and mixed evenly in an anhydrous ethanol medium with a magnetic stirrer, and the powder obtained by drying the mixed solution was placed in a muffle furnace for molten salt reaction. 7°C / min to 950°C, the holding time is 10min; the powder obtained after the molten salt reaction is washed with deionized water to remove the remaining soluble salt, and dried to obtain potassium sodium niobate powder with a flake shape body. According to the energy spectrum test, the molar ratio of K and Na in the...

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Abstract

The invention discloses a process for preparing flaky potassium-sodium niobate powders. The process includes using flaky K4b6O17, K2CO3, KCl and NaCl as reactants, using absolute ethyl alcohol as a medium, stirring and evenly mixing the mixture and subjecting the mixed liquid to drying, reaction, washing and drying to obtain the flaky potassium-sodium niobate powders KxNa1-xNbO3, wherein the x represents the molar fraction of the K, and X=0.4-0.6. The obtained flaky KNN powders are applicable to the technical field of piezoelectric ceramics, provide a flaky isotropic KNN template for texturing preparation of KNN-based leadless piezoelectric ceramics, and greatly promote the development of the technology of the texturing preparation of the leadless piezoelectric ceramics. The process for preparing the flaky potassium-sodium niobate powders is easy and convenient to operate, wide in material sources, low in device costs and convenient to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of inorganic material synthesis, in particular to a method for preparing flake potassium sodium niobate powder. Background technique [0002] Potassium sodium niobate (KNN) is an important piezoelectric ceramic raw material. Due to its excellent piezoelectric properties, it is currently the most widely studied, most practical, and most likely to replace lead zirconate titanate (PZT) based piezoelectric ceramics. Lead-free piezoelectric ceramic system for electrical materials. The textured growth technology in the preparation method of lead-free piezoelectric ceramics in the prior art can make the material achieve a crystal form similar to a single crystal, thereby showing performance similar to a single crystal, so that the material has better piezoelectric performance. At present, the existing texture preparation technology of KNN-based lead-free piezoelectric ceramics is based on flake NaNbO 3 or KNbO 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G33/00C04B35/495
Inventor 李月明沈宗洋刘志王竹梅洪燕谢俊
Owner JINGDEZHEN CERAMIC INSTITUTE