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Method for preparing nano-particle self-assembled square perovskite phase PbTiO3 micron piece

A perovskite phase and nanoparticle technology, which is applied in chemical instruments and methods, solutions from room temperature liquid solvents, single crystal growth, etc., can solve the problems of no discovery, low orientation, etc., and achieve regular morphology and good crystallinity , the effect of high purity

Active Publication Date: 2014-09-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Synthesis of PbTiO by Hydrothermal Method 3 In the process, only irregular products with relatively low orientation can be prepared through the traditional crystal growth route, and no regular product with a certain orientation can be synthesized by self-assembly through particle aggregation.

Method used

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  • Method for preparing nano-particle self-assembled square perovskite phase PbTiO3 micron piece
  • Method for preparing nano-particle self-assembled square perovskite phase PbTiO3 micron piece
  • Method for preparing nano-particle self-assembled square perovskite phase PbTiO3 micron piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) TiO 2 The powder was dissolved in a 15 mol / L KOH aqueous solution to adjust the Ti 4+ Concentration is 0.5 mol / L, get TiO 2 alkaline aqueous solution;

[0019] 2) Under stirring, add TiO prepared in step 1) 2 Add Pb(NO 3 ) 2 powder, adjusted Pb 2+ The ion concentration is 0.5 mol / L. After stirring for 5 min, add absolute ethanol solution to the system. The volume of absolute ethanol added is twice the volume of KOH aqueous solution used in step 1), and continue stirring for 2 h to obtain titanium and lead hydroxide suspension;

[0020] 3) Add the titanium and lead hydroxide suspension prepared in step 2) into a polytetrafluoroethylene reactor liner with a volume of 50 ml, and adjust the reaction materials in the reactor liner with absolute ethanol The volume reaches 80% of the inner tank volume of the reactor to obtain the reaction material;

[0021] 4) Put the reactor liner equipped with reaction materials in step 3) into the reactor, seal it, and set it at ...

Embodiment 2

[0023] 1) TiO 2 The powder was dissolved in a 15 mol / L KOH aqueous solution to adjust the Ti 4+ Concentration is 0.5 mol / L, get TiO 2 alkaline aqueous solution;

[0024] 2) Under stirring, add TiO prepared in step 1) 2 Add Pb(NO 3 ) 2 powder, adjusted Pb 2+ The ion concentration is 0.625 mol / L. After stirring for 5 minutes, add absolute ethanol solution to the system. The volume of absolute ethanol added is 3 times the volume of the KOH aqueous solution used in step 1), and continue stirring for 3 hours to obtain titanium and lead hydroxide suspension;

[0025] 3) Add the titanium and lead hydroxide suspension prepared in step 2) into a polytetrafluoroethylene reactor liner with a volume of 50 ml, and adjust the reaction materials in the reactor liner with absolute ethanol The volume reaches 80% of the inner tank volume of the reactor to obtain the reaction material;

[0026] 4) Place the reactor liner equipped with reaction materials in step 3) into the reactor, seal ...

Embodiment 3

[0028] 1) TiO 2 The powder was dissolved in a 15 mol / L KOH aqueous solution to adjust the Ti 4+ Concentration is 0.5 mol / L, get TiO 2 alkaline aqueous solution;

[0029] 2) Under stirring, add TiO prepared in step 1) 2 Add Pb(NO 3 ) 2 powder, adjusted Pb 2+ The ion concentration is 0.6 mol / L. After stirring for 5 min, add absolute ethanol solution to the system. The volume of absolute ethanol added is twice the volume of KOH aqueous solution used in step 1), and continue stirring for 3 h to obtain Titanium and lead hydroxide suspensions;

[0030] 3) Add the titanium and lead hydroxide suspension prepared in step 2) into a polytetrafluoroethylene reactor liner with a volume of 50 ml, and adjust the reaction materials in the reactor liner with absolute ethanol The volume reaches 80% of the inner tank volume of the reactor to obtain the reaction material;

[0031] 4) Put the reactor liner equipped with reaction materials in step 3) into the reactor, seal it, and set it at...

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Abstract

The invention discloses a method for preparing a nano-particle self-assembled square perovskite phase PbTiO3 micron piece. According to the method, a hydrothermal reaction method is adopted, titanium dioxide, potassium hydroxide, lead nitrate, deionized water and absolute ethyl alcohol are used as reaction materials, and hydrothermal reaction is performed in a reaction kettle at 120-200 DEG C, thereby obtaining the nano-particle self-assembled square perovskite phase PbTiO3 micron piece. The square perovskite phase PbTiO3 micron piece is high in crystallization property, high in purity and good in dispersity. The method is simple in process, regular and stable in product morphology, easy to control the product morphology, low in cost, free of pollution and easy to produce in large scale.

Description

technical field [0001] The present invention relates to a kind of PbTiO 3 Preparation method of microsheets, especially nanoparticle self-assembled tetragonal perovskite phase PbTiO 3 The invention discloses a method for preparing microsheets, belonging to the technical field of inorganic non-metallic materials. technical background [0002] Perovskite structure PbTiO 3 It is a typical ferroelectric oxide with simple structure and excellent ferroelectric, piezoelectric and dielectric properties. PbTiO 3 Has a high ferroelectric phase transition Curie temperature (490 o C) and high spontaneous polarization, it has a wide range of applications in the preparation of microelectronic devices such as non-volatile ferroelectric memory, piezoelectric sensors, infrared detectors and high dielectric capacitors. The advancement of science and technology and the miniaturization of electronic devices have put forward more and more requirements for the micronization and even nanoniza...

Claims

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Application Information

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IPC IPC(8): C30B29/32C30B7/10
Inventor 韩高荣尹思敏任召辉任杰沈鸽
Owner ZHEJIANG UNIV
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