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Method for preparing barium titanate monocrystal nano particles of six-pin structural perovskite

A technology of ore barium titanate and single crystal nano-particles, which is applied in the field of preparation of hexapod structure perovskite barium titanate single crystal nanoparticles, can solve the problem of few hexapod structures of barium titanate, and achieve easy scale production , High crystal purity, easy to control effect

Inactive Publication Date: 2012-09-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the work on nanomaterials with a hexapod structure is concentrated on single crystals or metal oxides, and there are few reports on ternary metal oxides, and the preparation of these hexapod structures requires the addition of additives such as CTBA or PVP. There are few reports on the hexapod structure of barium titanate

Method used

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  • Method for preparing barium titanate monocrystal nano particles of six-pin structural perovskite
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  • Method for preparing barium titanate monocrystal nano particles of six-pin structural perovskite

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example 1

[0020] 1) Using 5mM butyl titanate as the precursor, ethylene glycol monomethyl ether was used to prepare the titanium oxyhydroxide precipitation, and washed with deionized water for 5 times;

[0021] 2) Add the titanium oxyhydroxide precipitate prepared in step 1) to the potassium hydroxide mineralizer with a concentration of 1.5mol / L, 200 o C hydrothermal reaction 24h, and wash 3 times with deionized water, ethanol respectively, at 60 o C is dried to obtain K 2 Ti 6 o 13 Nanowire powder, its XRD pattern is shown in figure 1 , scanning electron microscope photo see figure 2 ;

[0022] 3) Dissolve barium acetate in deionized water, stir and dissolve to form barium acetate aqueous solution, adjust Ba 2+ The ion concentration is 0.125mol / L;

[0023] 4) The K obtained in step 2) 2 Ti 6 o 13 Add the nanowire powder to the solution in step 3), stir for not less than 20 minutes to obtain a suspension, and adjust the Ti 2+ The ion concentration is 0.125mol / L;

[0024] 5)...

example 2

[0027] 1) With 5mM butyl titanate as the precursor, ethylene glycol monomethyl ether was used to prepare the titanium oxyhydroxide precipitation, and the deionized water was washed 4 times;

[0028] 2) Add the titanium oxyhydroxide precipitate prepared in step 1) to the potassium hydroxide mineralizer with a concentration of 1.5mol / L, 200 o C hydrothermal reaction 24h, and wash 4 times with deionized water, ethanol respectively, and in 60 o C is dried to obtain K 2 Ti 6 o 13 nanowire powder;

[0029] 3) Dissolve barium acetate in deionized water, stir and dissolve to form barium acetate aqueous solution, adjust Ba 2+ The ion concentration is 0.156mol / L;

[0030] 4) The K obtained in step 2) 2 Ti 6 o 13 Add the nanowire powder to the solution in step 3), stir for not less than 20 minutes to obtain a suspension, and adjust the Ti 2+ The ion concentration is 0.125mol / L;

[0031] 5) Add the suspension prepared in step 4) into the potassium hydroxide mineralizer, adjust t...

example 3

[0034] 1) With 5mM butyl titanate as the precursor, ethylene glycol monomethyl ether was used to prepare the titanium oxyhydroxide precipitation, and the deionized water was washed 4 times;

[0035] 2) Add the titanium oxyhydroxide precipitate prepared in step 1) to the potassium hydroxide mineralizer with a concentration of 1.5mol / L, 200 o C hydrothermal reaction 24h, and wash 4 times with deionized water, ethanol respectively, and in 60 o C is dried to obtain K 2 Ti 6 o 13 nanowire powder;

[0036] 3) Dissolve barium acetate in deionized water, stir and dissolve to form barium acetate aqueous solution, adjust Ba 2+ The ion concentration is 0.188mol / L;

[0037] 4) The K obtained in step 2) 2 Ti 6 o 13 Add the nanowire powder to the solution in step 3), stir for not less than 20 minutes to obtain a suspension, and adjust the Ti 2+ The ion concentration is 0.125mol / L;

[0038] 5) Add the suspension prepared in step 4) to the potassium hydroxide mineralizer, adjust the...

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Abstract

The invention discloses a method for preparing barium titanate monocrystal nano particles of six-pin structural perovskite, and a two-step hydrothermal method is adopted. The method comprises the following steps of: depositing tetrabutyl titanate which serves as a precursor by use of oxyhydroxide of titanium prepared from ethylene glycol monomethyl ether; performing hydrothermal reaction by utilizing potassium hydroxide a mineralizer, so as to obtain a K2Ti6O13 nano line; and performing secondary hydrothermal reaction on the prepared K2Ti6O13 nano line which serves as a titanium source, barium acetate which serves as a barium source and KOH which serves as the mineralizer, so as to obtain the barium titanate monocrystal nano particles of the six-pin structural perovskite. The process is simple and easy to control; pollution is avoided; the cost is low; large-scale production is realized; and the barium titanate monocrystal nano particle crystal of the six-pin structural perovskite is high in purity and high in dispersion.

Description

technical field [0001] The invention relates to a method for preparing hexapod structure perovskite barium titanate single crystal nanoparticles, which belongs to the field of electrodeless non-metallic materials. Background technique [0002] Perovskite structure barium titanate (BaTiO 3 ) is a widely used and very popular ferroelectric material. Its unique node performance and good PTCR properties make it the focus of attention. BaTiO 3 Melting point is 1618 o C, after that, as the temperature decreases, the crystallized BaTiO3 will experience five crystal structures of hexagonal, cubic, tetragonal, monoclinic and triclinic. BaTiO 3 The Curie temperature of the crystal is 120 o C, temperature at 120 o When C is above, the barium titanate crystal is paraelectric, and the temperature is 120 o Below C, the barium titanate crystal is ferroelectric. Perovskite structure BaTiO 3 It has a wide range of applications in the preparation of multilayer ceramic capacitors (MLC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/32C30B29/66C30B7/10B82Y40/00
Inventor 任召辉韩高荣华常鑫钞春英沈鸽
Owner ZHEJIANG UNIV
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