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Bismuth sodium titanate nanometer flower and preparation method thereof

A technology of sodium bismuth titanate and nanoflowers, applied in chemical instruments and methods, titanium compounds, bismuth compounds, etc., can solve the problems of undisclosed production process parameters, failure to produce sodium bismuth titanate, and not nanoflower structure, etc. Achieve the effects of easy industrial production, good single crystal property, and cheap raw materials

Inactive Publication Date: 2011-04-20
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are deficiencies in both the product and the preparation method. First, the shape of the product is spherical or cubic, rather than a nanoflower structure, especially not a nanoflower structure composed of nanosheets.
This spherical or cubic nano-scale sodium bismuth titanate, because of its lower dielectric constant and higher dielectric loss, makes its ferroelectric properties different from that of traditional lead zirconate titanate (PbTiO 3 -PbZrO 3 , abbreviated as PZT) there is still a certain gap; secondly, the preparation method can neither produce sodium bismuth titanate with a nanoflower structure composed of nanosheets, nor disclose specific production process parameters, and even uses organic ethanol as a solvent , which increases the cost of making

Method used

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  • Bismuth sodium titanate nanometer flower and preparation method thereof
  • Bismuth sodium titanate nanometer flower and preparation method thereof
  • Bismuth sodium titanate nanometer flower and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020]The specific steps of preparation are as follows: firstly, add ammonia water to the 0.8M citric acid aqueous solution to adjust the pH to 4.5, then add tetrabutyl titanate to it, and stir it at 50°C for 9h to obtain A clear solution; wherein, the citric acid aqueous solution is prepared by adding citric acid to water at a temperature of 60° C., and the molar ratio between tetrabutyl titanate and citric acid is 1:2.5. In the second step, first mix the aqueous solution of bismuth nitrate pentahydrate with the clear solution, and stir it at 80°C for 40 minutes to obtain a uniform, transparent, and viscous mixed solution; wherein, the aqueous solution of bismuth nitrate pentahydrate is the Bismuth nitrate is prepared by adding bismuth nitrate to water at a temperature of 90°C and stirring for 25 minutes. The molar ratio between bismuth nitrate pentahydrate and citric acid in the clear solution is 1:3.5. Add sodium hydroxide to the mixed solution, and continue to stir for 25 ...

Embodiment 2

[0022] The specific steps of preparation are as follows: firstly, add ammonia water to the aqueous solution of citric acid with a concentration of 0.9M to adjust the pH to 5, then add tetrabutyl titanate to it, and stir it at 55°C for 8 hours to obtain A clear solution; wherein, the citric acid aqueous solution is prepared by adding citric acid to water at a temperature of 63° C., and the molar ratio between tetrabutyl titanate and citric acid is 1:2.8. In the second step, first mix the aqueous solution of bismuth nitrate pentahydrate with the clear solution, and stir it at 85°C for 38 minutes to obtain a uniform, transparent and viscous mixed solution; wherein, the aqueous solution of bismuth nitrate pentahydrate is the Bismuth nitrate is prepared by adding bismuth nitrate to water at a temperature of 93°C and stirring for 23 minutes. The molar ratio between bismuth nitrate pentahydrate and citric acid in the clear solution is 1:3.3. Add sodium hydroxide to the mixed solution...

Embodiment 3

[0024] The specific steps of preparation are as follows: the first step is to add ammonia water to the 1M citric acid aqueous solution to adjust the pH to 5.3, then add tetrabutyl titanate to it, and stir it at 60°C for 7 hours to obtain a clear solution; wherein, the citric acid aqueous solution is prepared by adding citric acid to water at a temperature of 65° C., and the molar ratio between tetrabutyl titanate and citric acid is 1:3. In the second step, first mix the aqueous solution of bismuth nitrate pentahydrate with the clear solution, and stir it at 90°C for 35 minutes to obtain a uniform, transparent, viscous mixed solution; wherein, the aqueous solution of bismuth nitrate pentahydrate is the Bismuth nitrate is prepared by adding bismuth nitrate to water at a temperature of 95°C and stirring for 20 minutes. The molar ratio between bismuth nitrate pentahydrate and citric acid in the clear solution is 1:3. Add sodium hydroxide to the mixed solution, and continue to stir...

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Abstract

The invention discloses a bismuth sodium titanate nanometer flower and a preparation method thereof. The nanometer flower comprises crossed vertical nanometer sheets which have the length of 250 nm to350 nm, the height of 50 nm to 150 nm and the thickness of 5 nm to 15 nm and are made of monocrystal perovskite bismuth sodium titanate. The method comprises the following steps: firstly, adding ammonia to a citric acid aqueous solution with the density of 0.8M to 1.2M and adjusting a pH value to be between 4.5 and 6; adding tetrabutyl titanate and stirring at 50 DEG C to 70 DEG C for longer than5 hours to obtain a clear solution; then, mixing a bismuth nitrate pentahydrate aqueous solution with the clear solution and stirring at 80 DEG C to 100 DEG C for longer than 30 minutes to obtain a mixed solution; afterwards, adding sodium hydroxide to the mixed solution and continuously stirring for longer than 15 minutes to obtain a synthetic solution; later, keeping the synthetic solution at 80 DEG C to 180 DEG C for 0 to 10 hours and washing to be neutral to obtain a product; and finally, drying the product to obtain the bismuth sodium titanate nanometer flower. The invention can be widely applied to the fields of machinery, electrons, precise control, and the like.

Description

technical field [0001] The invention relates to a nano flower and a preparation method thereof, in particular to a bismuth sodium titanate nano flower and a preparation method thereof. Background technique [0002] Sodium bismuth titanate as a lead-free alternative to ferroelectric materials is a very important ABO 3 Functional materials with a perovskite structure are widely used in the fields of machinery, electronics, and precision control. Utilizing its dielectric properties, ceramic capacitors can be made; when used as piezoelectric materials, it can be prepared into various sensors, high-temperature piezoelectric devices, piezoelectric transducers and driving devices, etc. The nanostructure of sodium bismuth titanate has attracted extensive attention of scientific researchers because of its large specific surface area. In order to explore and expand its application range, some attempts and efforts have been made, such as in the "Electronic Components and Materials, V...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G29/00C01G23/00
Inventor 李杰汪国忠蔡伟平王洪强
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI