Unlock instant, AI-driven research and patent intelligence for your innovation.

Sol-gel synthesis method for bismuth layer high-temperature piezoelectric ceramic sodium bismuth niobate nanopowder

A high-temperature piezoelectric, sodium bismuth niobate technology, applied in the field of piezoelectric ceramic materials, can solve the problems of sol difficulty, high price and limitation of niobium ethoxide, and achieve the effects of low price, high sintering activity and lower synthesis temperature.

Inactive Publication Date: 2013-07-31
BEIJING UNIV OF TECH
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of bismuth sodium niobate powder by sol-gel method needs to solve two key problems: one is the selection of niobium source, because niobium ethanol (Nb(OC 2 h 5 ) 5 ) has good solubility, so it is often used as a niobium source for the preparation of niobate powder by sol-gel method, but niobium ethanol is expensive and easy to hydrolyze, which limits the promotion of niobate powder prepared by sol-gel method The second is to prevent the hydrolysis of bismuth ions, which are easily hydrolyzed to generate bismuth oxynitrate (BiONO 3 ) white precipitate, which makes it very difficult to prepare a stable sol

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sol-gel synthesis method for bismuth layer high-temperature piezoelectric ceramic sodium bismuth niobate nanopowder
  • Sol-gel synthesis method for bismuth layer high-temperature piezoelectric ceramic sodium bismuth niobate nanopowder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Mix niobium pentoxide and potassium hydroxide at a molar ratio of 1:16, place the mixture in a platinum crucible and calcinate at 320°C for 3 hours to obtain a product that is dissolved in deionized water; titrate to pH=2 with nitric acid to obtain a large amount of The white precipitate was collected by centrifugation and washed with nitric acid to remove potassium ions; the precipitate was dissolved in oxalic acid solution, heated and stirred to obtain a clear and transparent niobium-containing oxalic acid solution A.

[0021] (2) Titrate the niobium-containing oxalic acid solution A obtained in step (1) with ammonia water to pH = 10, and obtain a white precipitate B through centrifugation.

[0022] (3) According to citric acid and Nb 5+ The ion molar ratio is 2:1. Weigh citric acid and prepare it as an aqueous solution. Dissolve the white precipitate B obtained in step (2) in the citric acid aqueous solution, heat and stir to obtain solution C.

[0023] (4) Acco...

Embodiment 2

[0030] Mix niobium pentoxide and potassium hydroxide at a molar ratio of 1:16, place the mixture in a platinum crucible, mix and calcinate at 300°C for 2 hours to obtain a product dissolved in deionized water; titrate to pH=3 with nitric acid; the rest are the same as in the examples 1. The obtained intermediate product G was calcined at 650° C. for 4 hours; the rest were the same as in Example 1. Made Na 0.5 Bi 2.5 Nb 2 o 9 (NBN) ceramic powder b, the powder X-ray diffraction pattern of product b is shown in figure 1 .

Embodiment 3

[0032] Mix niobium pentoxide and potassium hydroxide at a molar ratio of 1:16, place the mixture in a platinum crucible and mix and calcinate at 360°C for 2 hours to obtain a product that is dissolved in deionized water; Oxalic acid solution A to pH = 11; add ethanolamine to transparent sol E to adjust pH = 9; dry the obtained transparent sol E at 120°C for 48 hours to obtain transparent xerogel F; calcinate the above-mentioned intermediate product G at 850°C for 2 hours ; All the other are with embodiment 1. Made Na 0.5 Bi 2.5 Nb 2 o 9 (NBN) ceramic powder c, the powder X-ray diffraction pattern of product c is shown in figure 1 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Curie pointaaaaaaaaaa
Curie pointaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a sol-gel synthesis method for bismuth layer high-temperature piezoelectric ceramic sodium bismuth niobate nanopowder, and belongs to the technical field of piezoelectric ceramic materials. The method comprises the following steps of: mixing Nb2O5 and KOH, calcining to obtain a product, dissolving in deionized water, titrating by using nitric acid until the pH is 2 to 3, collecting a precipitate, and dissolving in oxalic acid to obtain a solution A; titrating by using ammonia water until the pH is 10 to 11, and performing centrifugal separation to obtain a white precipitate B; dissolving the B in citric acid to obtain a solution C; dissolving Na2CO3 and Bi(NO3)3 in acetic acid, adding ethanolamine for complexing Bi<3+> ions, and heating and stirring to form a solution D; mixing the solutions C and D, and adding ethanolamine to regulate the pH to 7-9 so as to obtain sol E; drying the E to obtain dried gel F; treating the dried gel F at the temperature of between 300 and 350 DEG C to obtain an intermediate product G; and crystallizing the intermediate product G at the temperature of between 650 and 850 DEG C. The production process is simple and low in cost and energy consumption, and the prepared NBN nanopowder comprises uniform components.

Description

technical field [0001] The invention relates to a preparation method of bismuth-layer high-temperature piezoelectric ceramic bismuth sodium niobate nanopowder, in particular to a sol-gel synthesis method of bismuth-layer high-temperature piezoelectric ceramic bismuth sodium niobate nanopowder, which belongs to piezoelectric ceramic materials technology field. Background technique [0002] The piezoelectric ceramics currently commercially used are still lead zirconate titanate Pb(Zr,Ti)O with a perovskite structure. 3 (abbreviated as PZT) system, the Curie temperature of this type of material is lower than 400°C (generally 250-380°C), and it is only suitable for use under normal conditions. With the rapid development of aerospace industry, nuclear energy industry, automobile manufacturing and other industries, the demand for high-temperature piezoelectric ceramic materials (Curie temperature greater than 400°C) is becoming more and more urgent. [0003] Bismuth-layer high-t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/624
Inventor 侯育冬荣井阳朱满康葛海燕严辉
Owner BEIJING UNIV OF TECH