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Method for preparing nano Sr(Fe0.5Nb0.5)O3 powder by microwave-hydrothermal method

A microwave hydrothermal method, powder technology, applied in the direction of nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of limited ceramic performance, low sinterability, high calcination temperature, etc., to achieve the improvement of large particle size, Improved dielectric properties and good dispersion

Active Publication Date: 2016-06-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the current Sr(Fe 0.5 Nb 0.5 )O 3 The materials are prepared by the traditional solid-phase method, but the ceramics prepared by the solid-state method often have defects such as large grain size, long ball milling cycle, high calcination temperature and low sinterability, which limit the improvement of ceramic performance.

Method used

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  • Method for preparing nano Sr(Fe0.5Nb0.5)O3 powder by microwave-hydrothermal method
  • Method for preparing nano Sr(Fe0.5Nb0.5)O3 powder by microwave-hydrothermal method

Examples

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example 1

[0034] A kind of microwave hydrothermal method of the present invention prepares nanometer Sr (Fe 0.5 Nb 0.5 )O 3 The powder method comprises the following steps, (1) preparing a dilute hydrochloric acid solution with a concentration of 1 mol / L and a NaOH solution with a concentration of 5 mol / L in advance for subsequent use. According to Sr(Fe 0.5 Nb 0.5 )O 3 The stoichiometric ratio of 2:1:1 accurately weighs Ba(NO 3 )2 , Fe(NO 3 ) 3 9H 2 O and NbCl 5 .

[0035] (2) Quickly weigh NbCl 5 , was dissolved in dilute hydrochloric acid prepared in advance, sealed with plastic wrap, and placed in a magnetic stirrer to stir for 10 h.

[0036] (3) Sr(NO 3 ) 2 Dissolve in deionized water, add Fe(NO 3 ) 3 9H 2 O, and add 8 drops of 30% hydrogen peroxide dropwise. During this process, the mixed solution A will be continuously stirred. When mixing evenly, the stirring time is 1 h.

[0037] (4) Add NbCl dropwise to the mixed solution A under stirring 5 hydrochloric acid ...

example 2

[0041] A kind of microwave hydrothermal method of the present invention prepares nanometer Sr (Fe 0.5 Nb 0.5 )O 3 The method for the powder comprises the following steps, (1) preparing a dilute hydrochloric acid solution with a concentration of 2 mol / L and a NaOH solution with a concentration of 8 mol / L in advance for subsequent use. According to Sr(Fe 0.5 Nb 0.5 )O 3 The stoichiometric ratio of 2:1:1 accurately weighs Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O and NbCl 5 .

[0042] (2) Quickly weigh NbCl 5 , was dissolved in dilute hydrochloric acid prepared in advance, sealed with plastic wrap, and placed in a magnetic stirrer to stir for 12 hours.

[0043] (3) Sr(NO 3 ) 2 Dissolve in deionized water, add Fe(NO 3 ) 3 9H 2 O, and add 10 drops of 30% hydrogen peroxide dropwise. During this process, the mixed solution A should be continuously stirred. When mixing evenly, the stirring time is 1.5h.

[0044] (4) Add NbCl dropwise to the mixed solution A under stirring 5 ...

example 3

[0048] A kind of microwave hydrothermal method of the present invention prepares nanometer Sr (Fe 0.5 Nb 0.5 )O 3 The method for the powder comprises the following steps, (1) preparing a dilute hydrochloric acid solution with a concentration of 3mol / L and a NaOH solution with a concentration of 10mol / L in advance for subsequent use. According to Sr(Fe 0.5 Nb 0.5 )O 3 The stoichiometric ratio of 2:1:1 accurately weighs Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O and NbCl 5 .

[0049] (2) Quickly weigh NbCl 5 , was dissolved in dilute hydrochloric acid prepared in advance, sealed with plastic wrap, and placed in a magnetic stirrer to stir for 15 hours.

[0050] (3) Sr(NO 3 ) 2 Dissolve in deionized water, add Fe(NO 3 ) 3 9H 2 O, and add 15 drops of 30% hydrogen peroxide dropwise. During this process, the mixed solution A will be continuously stirred. When mixing evenly, the stirring time is 2 hours.

[0051] (4) Add NbCl dropwise to the mixed solution A under stirring 5 ...

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Abstract

The invention provides a method for preparing nano Sr(Fe0.5Nb0.5)O3 powder by a microwave-hydrothermal method, comprising the following steps of (1) weighing raw materials, namely, Sr(NO3)2, Fe(NO3)3.9H2O and NbCl5; (2) adding the Sr(NO3)2 into deionized water; (3) adding the Fe(NO3)3.9H2O into an Sr(NO3)2 aqueous solution, dripping 8 to 15 drops of hydrogen peroxide into a mixture to obtain a mixed solution A; (4) adding the NbCl5 into a dilute hydrochloric acid solution; then dropwise adding the NbCl5 hydrochloric acid solution into the mixed solution A, and uniformly mixing to obtain a mixed solution B; (5) titrating the mixed solution B with an NaOH solution to form a coprecipitation precursor of the Sr(Fe0.5Nb0.5)O3; (6) transferring a precursor solution of the Sr(Fe0.5Nb0.5)O3 to a microwave hydrothermal reaction kettle, reacting to obtain powder, anddrying the powder after washing the powder for several times, so as to obtain the nano-sized Sr(Fe0.5Nb0.5)O3 powder.

Description

technical field [0001] The present invention relates to the wet chemical method preparation nano-powder technology, specifically a kind of microwave hydrothermal method preparation nano-Sr(Fe 0.5 Nb 0.5 )O 3 powder method. Background technique [0002] With the development of the electronic information industry, giant dielectric constant materials have potential application prospects in the fields of miniaturization, miniaturization, integration of electronic components and energy storage materials. Sr(Fe 0.5 Nb 0.5 )O 3 Ceramics have the same properties as Sr(Fe 0.5 B 0.5 )O 3 (B=Nb, Ta) ceramics have a similar giant dielectric effect, and there is a giant dielectric constant platform near room temperature, and its dielectric constant can reach 10 3 . In addition, Sr(Fe 0.5 Nb 0.5 )O 3 Ceramic is a kind of relaxor ferroelectric material with extremely high dielectric constant and good temperature stability and frequency stability, so it has broad application pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00B82Y40/00
CPCC01G49/009C01P2002/72C01P2004/03C01P2004/64
Inventor 王卓王春房明瑞王添肖雨佳
Owner SHAANXI UNIV OF SCI & TECH
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