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, unable to produce sodium bismuth titanate, not nanoflower structure, and the like, Achieve the effect of easy industrial production, good single crystallinity, and cheap raw materials

Inactive Publication Date: 2009-10-28
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 proper...

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

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Embodiment 1

[0020]The specific preparation steps are as follows: the first step, adding ammonia water to the citric acid aqueous solution with a concentration of 0.8M to adjust the pH to 4.5, then adding tetrabutyl titanate to it, and stirring it at 50° C. for 9 hours to obtain A clear solution; wherein, the aqueous citric acid 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, the aqueous solution of bismuth nitrate pentahydrate is mixed with the clear solution, and stirred at 80° C. for 40 minutes to obtain a uniform, transparent and viscous mixed solution; wherein, the aqueous solution of bismuth nitrate pentahydrate is a mixture of The bismuth nitrate is added into water at a temperature of 90° C. and stirred for 25 minutes to prepare, and the molar ratio between the bismuth nitrate pentahydrate and the citric acid in the clear solution is 1:3.5. The sodium hydroxid...

Embodiment 2

[0022] The specific preparation steps are as follows: the first step, adding ammonia water to the citric acid aqueous solution with a concentration of 0.9M to adjust the pH to 5, then adding tetrabutyl titanate thereinto, and stirring 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 bismuth nitrate pentahydrate solution 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 a mixture of The bismuth nitrate was added into water at a temperature of 93° C. and stirred for 23 minutes to prepare, and the molar ratio between the bismuth nitrate pentahydrate and the citric acid in the clear solution was 1:3.3. The sodium hydroxi...

Embodiment 3

[0024] The specific preparation steps are as follows: the first step, adding ammonia water to the citric acid aqueous solution with a concentration of 1M to adjust the pH to 5.3, then adding tetrabutyl titanate to it, and stirring it at 60° C. for 7 hours to obtain clarification 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, the aqueous bismuth nitrate pentahydrate solution is mixed with the clear solution, and stirred at 90° C. for 35 minutes to obtain a uniform, transparent and viscous mixed solution; wherein, the aqueous bismuth nitrate pentahydrate solution is a mixture of The bismuth nitrate is added into water at a temperature of 95° C. and stirred for 20 minutes to prepare, and the molar ratio between the bismuth nitrate pentahydrate and the citric acid in the clear solution is 1:3. The sodium hydroxide was...

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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 to 350 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 than 5 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, in particular to a sodium bismuth titanate nano flower and a preparation method thereof. Background technique [0002] Sodium bismuth titanate is a very important ABO as a lead-free substitute for ferroelectric materials 3 The functional materials with perovskite structure have a wide range of applications in the fields of machinery, electronics, and precision control. Using 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. The nanostructure of sodium bismuth titanate has aroused extensive attention of scientific researchers because of its large specific surface area. In order to explore and expand its application scope, people have made some attempts and efforts, such as the "Electronics" published in November 200...

Claims

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Application Information

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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
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