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Colloidal sols gelatin synthesizing method for leadless piezoelectric ceramic lithium sodium kalium niobate nano-powder

A nano-powder, lead-free piezoelectric technology, applied in the field of piezoelectric ceramic material preparation, can solve the problems of restricting the industrialization of niobate powder, high price of niobium ethanol, cumbersome use and operation, etc., and achieve a narrow range of size distribution , high sintering activity, and the effect of lowering the synthesis temperature

Inactive Publication Date: 2008-07-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, niobium ethanol is expensive, easily hydrolyzed and needs to be stored under special conditions, and the operation is cumbersome, which limits the industrialization of niobate powder prepared by sol-gel method

Method used

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  • Colloidal sols gelatin synthesizing method for leadless piezoelectric ceramic lithium sodium kalium niobate nano-powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) The product obtained by mixing niobium pentoxide and potassium pyrosulfate in a molar ratio of 1:8 and calcining at 300°C for 2 hours was dissolved in deionized water; then the pH value was titrated to 2 with nitric acid to obtain a white precipitate; the obtained product was centrifuged The white precipitate is dissolved in oxalic acid solution, and after stirring, a clear and transparent niobium-containing oxalic acid solution A is obtained;

[0019] (2) Titrate the niobium-containing oxalic acid solution A obtained in step 1 with ammonia water to a pH value of 10, and obtain a white precipitate B through centrifugation and deionized water washing;

[0020] (3) press piezoelectric ceramic lithium sodium potassium niobate (Li0.06Na0.47K0.47) NbO Composition ratio, lithium carbonate, sodium carbonate and salt of wormwood are dissolved in acetic acid and make solution, this solution and step 2 obtain The white precipitate B was added to the citric acid aqueous soluti...

Embodiment 2

[0026] Mix niobium pentoxide and potassium pyrosulfate at a molar ratio of 1:8 and calcinate at 280°C for 1 hour to dissolve in deionized water; then titrate the pH value to 3 with nitric acid; Calcination 2h, all the other conditions are the same as in Example 1. Prepare ceramic powder b. The powder X-ray diffraction pattern of product b is shown in Figure 1.

Embodiment 3

[0028] The product obtained by mixing niobium pentoxide and potassium pyrosulfate at a molar ratio of 1:8 and calcining at 320°C for 2 h was dissolved in deionized water; the niobium-containing oxalic acid solution A was titrated with ammonia water to a pH value of 11; the transparent sol C was Dry at 120°C for 48 hours to obtain a transparent xerogel D; the intermediate product E obtained above was calcined at 600°C for 5 hours, and the rest of the conditions were the same as in Example 1. Prepare ceramic powder c. The powder X-ray diffraction pattern of product c is shown in Figure 1.

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Abstract

The invention belongs to a technical field for preparing piezoelectric ceramic material. The existing commercial piezoelectric ceramic still takes ceramic of lead zirconate titanate matrix as the main material, which causes great damage to the environment. The invention comprises the following processes: products obtained by calcining mixture of niobium pentoxide and potassium pyrosulfate by molar ratio of 1:8 at temperature of 280 to 320 DEG C for 1 to 2 hours are dissolved in oxalic acid solution to regulate the pH value to 2 to 3 and obtain white sedimentation; the white sedimentation is then centrifugally settled and dissolved in the oxalic acid solution; after stirring, transparent and clear oxalic acid solution A containing niobium is obtained; the pH value of the solution A is adjusted to 10 to 11, and white sedimentation B is obtained through centrifugation; according to ratio of lithium, sodium and kalium niobate of piezoelectric ceramic, lithium carbonate, sodium carbonate and kalium carbonate are dissolved in acetic acid to obtain solution; the solution and the sedimentation B are added in citric acid solution with concentration of 8 to 10 mol / L, and a yellow transparent sol C is obtained through stirring; the yellow transparent sol C is dried at 80 to 120 DEG C for 48 hours to obtain a transparent dry gel D; after the transparent dry gel D is processed at 300 to 400 DEG C for 2 hours and organic components are removed, an intermediate E is obtained; then the intermediate E is calcined for 2 to 8 hours at 500 to 600 DEG C. The method has narrow range of size distribution of powder particles, uniform components, and reduced cost.

Description

technical field [0001] The invention relates to a sol-gel synthesis method of lead-free piezoelectric ceramic lithium sodium potassium niobate nanopowder, which belongs to the technical field of piezoelectric ceramic material preparation. Background technique [0002] At present, the commercial piezoelectric ceramics are still based on lead zirconate titanate (Pb(Zr,Ti)O3, abbreviated as PZT) based ceramics. However, the main raw material of PZT-based ceramics is PbO, which has high toxicity and will cause great damage to human health and the environment during production and recycling. [0003] Lead-free piezoelectric ceramic lithium sodium potassium niobate ((Li0.06Na0.47K0.47)NbO3, abbreviated as LNKN) has attracted widespread attention due to its excellent piezoelectric properties and is considered to be the best choice for PZT-based piezoelectric ceramics. possible substitutes. At present, the synthesis of potassium lithium niobate piezoelectric ceramic powder general...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/624
Inventor 侯育冬王超朱满康唐剑兰宋雪梅王如志张铭汪浩王波严辉
Owner BEIJING UNIV OF TECH
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