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Method for preparing strontium titanate nanopowder by low temperature solid phase reaction

A solid-phase reaction, nano-powder technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of high reaction temperature, high cost of reaction raw materials, environmental pollution, etc., and achieve low reaction temperature and small product particles. , The effect of the process is simple and easy to control

Inactive Publication Date: 2014-08-27
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Technical problem: Preparation of SrTiO against existing technologies 3 Nano-powder has problems such as high reaction temperature, high cost of reaction raw materials, and easy environmental pollution. The present invention proposes a NaCl(l)-H 2 Preparation of SrTiO by O(g) Fluid-Assisted Solid State Reaction 3 The method of nano-powder, that is, the method of preparing strontium titanate nano-powder by low-temperature solid-state reaction, has the characteristics of low reaction temperature, cheap raw materials, small product particles, green and pollution-free, etc.

Method used

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  • Method for preparing strontium titanate nanopowder by low temperature solid phase reaction
  • Method for preparing strontium titanate nanopowder by low temperature solid phase reaction
  • Method for preparing strontium titanate nanopowder by low temperature solid phase reaction

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Embodiment 1

[0031] Mix strontium carbonate (Shanghai Sinopharm Chemical Reagent Co., Ltd.), titanium dioxide (Shanghai Sinopharm Chemical Reagent Co., Ltd.) and sodium chloride (Shanghai Sinopharm Chemical Reagent Co., Ltd.) according to the material ratio of 1:1:8. As a dispersant, ball mill at 280rpm for 6 hours to obtain a paste, then dry in an oven at 80°C for 6 hours, grind and sieve to obtain a powder with a particle size of 150 microns, then put the powder into a porcelain boat, put into a tube furnace, heated to 700°C in the presence of water vapor, the amount of water vapor added in the tube furnace was 1.0mL / min, reacted for 2 hours, the product was washed with water and ethanol, centrifuged and dried to obtain SrTiO 3 nanoparticles.

[0032] The phase analysis of the powder was carried out by a Japanese Rigaku D / max-γA X-ray powder diffraction (XRD) instrument, Cu Graphite monochromator, tube voltage and current are 40kV and 20mA, scanning speed 10.0° min -1 . figure 1 X-r...

Embodiment 2

[0036] The difference from Example 1 is that the mass ratio of strontium carbonate, titanium dioxide and sodium chloride is mixed at 1:1:0, and then a solid phase reaction is carried out, which needs to be reacted at 900 ° C for 2 hours, SrCO 3 and TiO 2 can be completely converted into SrTiO 3 Nano powder, SrTiO 3 The average particle size of nanoparticles is about 200nm, but the agglomeration is particularly serious, and the nanoparticles are assembled into particles with a size of about 50 microns, such as Figure 6 shown.

Embodiment 3

[0038] The difference from Example 1 is that the mass ratio of strontium carbonate, titanium dioxide and sodium chloride is mixed at 1:1:1, and then a solid phase reaction is carried out, which needs to be reacted at 750 ° C for 2 hours, SrCO 3 and TiO 2 can be completely converted into SrTiO 3 Nano powder, SrTiO 3 The average particle size of nanoparticles is about 200 nanometers, but the agglomeration is serious, and the nanoparticles are assembled into particles with a size of about 20 microns, such as Figure 7 shown.

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Abstract

A method for preparing strontium titanate nanopowder by a low temperature solid phase reaction comprises the following steps: performing ball milling of strontium carbonate, titanium dioxide and sodium chloride according to a mol ratio of 1:1:0-16 with ethanol as a dispersant to obtain a paste, drying the paste at 80 DEG C for 6 hours, grinding and sieving the paste to prepare powder with a particle size of not more than 150 microns, putting the powder into a porcelain boat, putting the porcelain boat in a tubular furnace, heating to 500-900 DEG C in the presence of water vapor to react for 2 hours, washing the product with water and ethanol, and performing centrifugal separation and drying to obtain the strontium titanate nanopowder. The method of the invention adopts solid phase reaction technology, and carries out a solid reaction of SrCO3 and TiO2 with the assistance of NaCl(l)-H2O(g) to enable all the SrCO3 and TiO2 to be converted into nanometer SrTiO3 powder; when compared with reaction technology in the prior art, the method of the invention has the characteristics of simple and easily controlled process, low reaction temperature, cheap raw materials, small product particles, environment friendliness and no pollution, and the like.

Description

technical field [0001] The present invention belongs to SrTiO 3 Nano-ceramic powder preparation technical field, specifically relate to a kind of solid phase reaction low-temperature preparation strontium titanate (SrTiO 3 ) method of nano ceramic powder. Background technique [0002] ABOs 3 Perovskite structure composite oxides are a class of new functional materials with excellent performance and wide application. They have stable crystal structure, unique electromagnetic properties, and good redox, hydrogenolysis, isomerization, photocatalytic and other activities. Strontium titanate (SrTiO 3 ) as a typical perovskite-type ternary oxide is not only widely used in electronics, machinery and ceramics industries because of its high dielectric constant, low dielectric loss, and good thermal stability, but also because of its prohibition With a band width of 3.2eV, it is also used as an excellent photocatalyst for photocatalytic degradation of organic pollutants and photoc...

Claims

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Application Information

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IPC IPC(8): C01G23/00B82Y30/00
Inventor 张俊豪袁爱华张龙梅
Owner JIANGSU UNIV OF SCI & TECH
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