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Method for preparing monocrystal bismuth titanate nanosheet

A technology of bismuth titanate and nanosheets, applied in the direction of single crystal growth, nanotechnology, single crystal growth, etc., can solve the problems of irregular powder morphology, uneven particle size distribution, affecting material properties, etc., and achieve the reaction time. The effect of short time, lower reaction temperature and simple equipment

Active Publication Date: 2015-01-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods generally need to be sintered at a temperature higher than 600°C, which consumes a lot of energy, and will lead to uneven particle size distribution or irregular powder morphology, which will eventually affect the performance of the material.

Method used

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  • Method for preparing monocrystal bismuth titanate nanosheet
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  • Method for preparing monocrystal bismuth titanate nanosheet

Examples

Experimental program
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Embodiment 1

[0028] Such as figure 1 As shown, the Bi of this embodiment 4 Ti 3 o 12 The preparation process includes the following steps:

[0029] According to Bi 4 Ti 3 o 12 Chemical formula, weigh 4mmol Bi 2 o 3 and 6mmol TiO 2 . The weighed Bi 2 o 3 and TiO 2 Put it into a ceramic mortar, add 84mmol tartaric acid, and after fully grinding in the ceramic mortar for 10 minutes, move the mixture to a crucible; put the crucible in a heating mantle and heat it to 250°C, and the mixture starts to burn; after the combustion is complete, naturally cool to room temperature , wash the obtained powder with 3mol / L dilute nitric acid to remove unreacted Bi 2 o 3 and TiO 2 , and then washed with deionized water until neutral, and dried in an oven at 85° C. to obtain the product bismuth titanate nanopowder, and the bismuth titanate is a nanosheet.

[0030] figure 2 For the prepared Bi of embodiment 1 of the present invention 4 Ti 3 o 12 X-ray diffraction pattern of the powder. D...

Embodiment 2

[0035] Bi of this embodiment 4 Ti 3 o 12 The preparation process comprises the following steps: according to Bi 4 Ti 3 o 12 Chemical formula, weigh 2mmol Bi 2 o 3 and 3 mmol TiO 2 . The weighed Bi 2 o 3 and TiO 2 Put into a ceramic mortar, add 45mmol sucrose, fully grind in the ceramic mortar for 8 minutes, move the mixture to a crucible; put the crucible in a heating mantle and heat it to 300°C, and the mixture starts to burn; after the combustion is complete, cool it naturally to room temperature, Wash the obtained powder with 2mol / L dilute nitric acid to remove unreacted Bi 2 o 3 and TiO 2, washed with deionized water until neutral, and dried in an oven at 85°C to obtain a single crystal bismuth titanate nanosheet with an edge size of about 150-250nm and a thickness of about 15-30nm.

Embodiment 3

[0037] According to Bi 4 Ti 3 o 12 Chemical formula, weigh 3mmol Bi 2 o 3 and 4.5 mmol TiO 2 . The weighed Bi 2 o 3 and TiO 2 Put it into a ceramic mortar, add 65mmol glycine, fully grind in the ceramic mortar for 10 minutes, and move the mixture to a crucible; put the crucible in a heating mantle and heat it to 300°C, and the mixture starts to burn; after the combustion is complete, cool it naturally to room temperature, Wash the obtained powder with 2.5mol / L dilute nitric acid to remove unreacted Bi 2 o 3 and TiO 2 , and then washed with deionized water until neutral, and dried in an oven at 85°C to obtain a single-crystal bismuth titanate nanosheet with an edge size of about 100-250nm and a thickness of about 20-35nm.

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Abstract

The invention discloses a method for preparing monocrystal bismuth titanate nanosheet, which comprises the following steps: 1)according to a chemical reaction of Bi4Ti3O12, metering and weighing Bi2O3 and TiO2, and placing in a ceramic mortar, adding carbohydrate, grinding for 8-10 minutes in the ceramic mortar to obtain a mixture; 2)heating the obtained mixture until the mixture begins to combust, and obtaining the powder after completely combustion; and 3)washing the obtained power in the step 2) by using dilute nitric acid, removing the unreacted bismuth oxide and titanium oxide, washing to neutrality by using deionized water, and placing in a baking oven for drying to obtain the products monocrystal bismuth titanate nanosheet. The preparation method has the advantages of low temperature, saved energy, simple step, short reaction time within 10 minutes for whole combustion reaction, high efficiency, high crystallization degree of the synthesized monocrystal bismuth titanate nanosheet, and easy control of synthesis, equipment required by synthesis is simple, and a high-energy bowl mill and a high temperature furnace are not required.

Description

technical field [0001] The invention relates to a method for preparing bismuth titanate nanopowder, in particular to a method for preparing single crystal bismuth titanate nanosheets. Background technique [0002] Currently, lead zirconate titanate (Pb x Zr 1–x TiO 3 )-based materials have been widely used as piezoelectric ceramics. However, Pb x Zr 1–x TaO 3 Ceramics will pollute the environment in the process of preparation and waste disposal. With people's increasing attention to environmental issues, lead-free piezoelectric ceramic materials have become one of the urgent research topics in the field of electronic materials. Bismuth titanate (Bi 4 Ti 3 o 12 ) crystal with bismuth oxide layer (Bi 2 o 2 ) 2+ and perovskite-like layers (Bi 2 Ti 3 o 10 ) 2- Arranged alternately, it is a piezoelectric material with a typical layered perovskite structure. Bi 4 Ti 3 o 12 The ferroelectric properties have large anisotropy, and the spontaneous polarization (2P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B1/10B82Y40/00
CPCC30B29/32B82Y40/00C30B1/10
Inventor 陈志武金无量康雄兵
Owner SOUTH CHINA UNIV OF TECH
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