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Preparation method and product of Bi4Ti3O12 micron sheets

A technology of micron flakes and concentration, applied in chemical instruments and methods, inorganic chemistry, bismuth compounds, etc., can solve the problems of difficulty in controlling the shape of bismuth titanate, serious agglomeration, etc., and achieve easy large-scale production, simple preparation process, and product purity. high effect

Inactive Publication Date: 2014-12-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually, Bi 4 Ti 3 o 12 The preparation of bismuth titanate mostly adopts solid phase method, but the prepared product not only agglomerates seriously, but also it is difficult to control the shape of the synthesized bismuth titanate

Method used

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  • Preparation method and product of Bi4Ti3O12 micron sheets
  • Preparation method and product of Bi4Ti3O12 micron sheets
  • Preparation method and product of Bi4Ti3O12 micron sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh 5.1 mmol of tetrabutyl titanate, add it dropwise into deionized water, and control the concentration of tetrabutyl titanate to 0.4 mol / L.

[0033] 2) Weigh 6.8 mmol of bismuth nitrate pentahydrate, add it into the suspension prepared in step 1), and stir thoroughly.

[0034] 3) Weigh 0.04 mol of potassium hydroxide, add to the suspension solution prepared in step 2), and stir for at least 30 minutes.

[0035] 4) Weigh 1.13 mmol polyvinyl alcohol (PVA), dissolve it in deionized water, and control the concentration of PVA to be 0.113 mol / L.

[0036] 5) In the stirring state, add the PVA solution prepared in step 4) dropwise to the suspension prepared in step 3), and disperse through sufficient stirring and ultrasonic vibration, and adjust its volume to account for the reaction with deionized water. 4 / 5 of the volume of the inner tank of the kettle, and the precursor solution is obtained at this time.

[0037] 6) Add the precursor solution prepared in step 5) in...

Embodiment 2

[0040] 1) Weigh 5.1 mmol of tetrabutyl titanate, add it dropwise into deionized water, and control the concentration of tetrabutyl titanate to 0.6 mol / L.

[0041] 2) Weigh 6.8 mmol of bismuth nitrate pentahydrate, add it into the suspension prepared in step 1), and stir thoroughly.

[0042] 3) Weigh 0.04 mol of potassium hydroxide, add to the suspension solution prepared in step 2), and stir for at least 30 minutes.

[0043] 4) Weigh 1.15 mmol polyvinyl alcohol (PVA), dissolve it in deionized water, and control the concentration of PVA to be 0.115 mol / L.

[0044] 5) In the stirring state, add the PVA solution prepared in step 4) dropwise to the suspension prepared in step 3), and disperse through sufficient stirring and ultrasonic vibration, and adjust its volume to account for the reaction with deionized water. 4 / 5 of the volume of the inner tank of the kettle, and the precursor solution is obtained at this time.

[0045] 6) Add the precursor solution prepared in step 5) in...

Embodiment 3

[0048] 1) Weigh 5.1 mmol of tetrabutyl titanate, add it dropwise into deionized water, and control the concentration of tetrabutyl titanate to 0.6 mol / L.

[0049] 2) Weigh 6.8 mmol of bismuth nitrate pentahydrate, add it into the suspension prepared in step 1), and stir thoroughly.

[0050] 3) Weigh 0.04 mol of potassium hydroxide, add to the suspension solution prepared in step 2), and stir for at least 30 minutes.

[0051] 4) Weigh 1.17 mmol polyvinyl alcohol (PVA), dissolve it in deionized water, and control the concentration of PVA to be 0.117 mol / L.

[0052] 5) In the stirring state, add the PVA solution prepared in step 4) dropwise to the suspension prepared in step 3), and disperse through sufficient stirring and ultrasonic vibration, and adjust its volume to account for the reaction with deionized water. 4 / 5 of the volume of the inner tank of the kettle, and the precursor solution is obtained at this time.

[0053] 6) Add the precursor solution prepared in step 5) into...

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Abstract

The invention discloses a preparation method of Bi4Ti3O12 micron sheets. The preparation method comprises the following steps: mixing tetrabutyl titanate, bismuth nitrate pentahydrate and water so as to obtain suspension, mixing KOH with the suspension, further dripping a PVA solution into the suspension so as to obtain a precursor solution, and performing hydrothermal reaction for 22-24 hours at 220-240 DEG C, thereby obtaining the Bi4Ti3O12 micron sheets, wherein the mole ratio of bismuth nitrate pentahydrate to tetrabutyl titanate is (3.75-4.25) to (2.75-3.25), the concentration of KOH in the precursor solution is 0.8-1.2mol / L, the concentration of Bi<3+> is 0.1-0.2mol / L, and the concentration of PVA is 0.02-0.03mol / L. By precisely regulating and controlling the use amount of the above raw materials and the conditions of the hydrothermal reaction, the Bi4Ti3O12 micron sheets are prepared, and the preparation process is simple, can be easily controlled and can be applied to large-scale industrialized production.

Description

technical field [0001] The present invention relates to the preparation method of bismuth titanate material, relate in particular to a kind of Bi 4 Ti 3 o 12 Preparation method and product of microsheet. Background technique [0002] It is well known that the structure and morphology of materials have an important impact on their physical and chemical properties, which has also triggered a lot of research on micro-nano materials with various morphological structures. Ferroelectric materials with properties such as ferroelectricity, piezoelectricity, pyroelectricity, electro-optic and nonlinear optics are also an important class of functional materials, and the research on their preparation and properties has become a research hotspot today. [0003] Bi 4 Ti 3 o 12 It has a high Curie temperature and polarization strength, and the Curie temperature of its ferroelectric phase transition is 750 ° C. It also has many advantages such as a low dielectric constant and signifi...

Claims

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Application Information

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IPC IPC(8): C01G29/00
Inventor 徐刚白惠文邓世琪沈鸽韩高荣
Owner ZHEJIANG UNIV
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