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Ruddlesden-popper homologous perovskite structure ceramic powder and preparation method thereof

A perovskite structure and ceramic powder technology, which is applied in the field of ceramic powder preparation, can solve the problems of slow reaction, impure powder, and difficult control, and achieve low sintering temperature, short grinding time, and good formability Effect

Inactive Publication Date: 2013-03-06
HEBEI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent [02132373.9] prepared strontium titanate powder by using a high-gravity reactor. During the preparation process, SrCl 2 and TiCl 4 Adding sodium hydroxide solution to the mixed solution is easy to generate Ti(OH) 4 Precipitation, and it is not easy to remove Cl ions during repeated filtration; Chinese patent [201110148088.8] uses a microwave-assisted hydrothermal method to prepare a pure-phase strontium titanate nanopowder at a lower temperature and a shorter time. Sodium hydroxide solution and filtering precipitates are easy to enter impurities and make the obtained powder impure; Chinese patent [98114550.7] uses the sol-gel method to prepare nano-strontium titanate powder. In this method, strontium salt solution is dripped into In the fatty alcohol solution of titanate and titanium alkoxide, the reaction needs to be slow and difficult to control

Method used

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  • Ruddlesden-popper homologous perovskite structure ceramic powder and preparation method thereof
  • Ruddlesden-popper homologous perovskite structure ceramic powder and preparation method thereof
  • Ruddlesden-popper homologous perovskite structure ceramic powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1 Preparation of SrTiO 3 Powder

[0053] Specific steps are as follows:

[0054] (1) Design the sample composition and calculate the ratio, and weigh the raw materials according to the stoichiometric ratio;

[0055] (2) Add 0.05 mol of Sr(NO 3 ) 2 Dissolve in a beaker filled with deionized water, place the beaker on a magnetic stirrer and stir to completely dissolve to obtain clear Sr(NO 3 ) 2 solution, called A solution;

[0056] (3) Use another beaker to weigh 100 ml of ethanol and 10 ml of glacial acetic acid and mix evenly, then slowly drop 17.3480 ml of tetrabutyl titanate into the solution with a pipette, continue to stir and make it completely Dissolve to obtain a transparent solution, which is called B solution;

[0057] (4) Add an appropriate amount of nitric acid solution to A solution to make A solution acidic;

[0058] (5) Slowly drop B solution into A solution, make it fully stirred and mixed evenly, and call it C solution;

[0059] (6) Dis...

Embodiment 2

[0065] Example 2 Preparation of Sr 4 Ti 3 o 10 powder

[0066] Except that the content of strontium nitrate was changed to 0.01 mol, the content of tetrabutyl titanate to 10.4088 ml, citric acid to 84 g, and the final sintering temperature to 1050°C, the rest was the same as in Example 1.

[0067] Determination of Sr by XRD phase analysis 4 Ti 3 o 10 The powder is a pure single-phase substance. Through the test and analysis of the dielectric constant, it is known that Sr at 100 kHz 4 Ti 3 o 10 The dielectric constant of the powder pressed block is 54, and the dielectric loss value is very small.

Embodiment 3

[0068] Example 3 Preparation of Sr 3 Ti 2 o 7 powder

[0069] Except that the content of strontium nitrate was changed to 0.02 mol, the content of tetrabutyl titanate to 13.8784 ml, the content of ethanol to 90 ml, the content of glacial acetic acid to 9 ml, the content of citric acid to 118 g, and the final sintering temperature to 950°C, the rest was the same as in Example 1.

[0070] Determination of Sr by XRD phase analysis 3 Ti 2 o 7 The powder is a pure single-phase substance. Through the test and analysis of the dielectric constant, it is known that Sr at 100 kHz 3 Ti 2 o 7 The dielectric constant of the powder pressed block is 41, and the dielectric loss value is very small.

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Abstract

The present invention discloses a ruddlesden-popper (R-P) homologous perovskite structure ceramic powder. The chemical formula of the powder is: Sr[n+1]Ti[n]O[3n+1], wherein n=1,2,3 to infinite. The preparation method thereof uses a sol-gel method, and has the advantages that the products have high purity and uniformity, sintering temperature is low, the reaction is easy to control, the material composition can be adjusted, the formability is good, and Sr[n+1]Ti[n]O[3n+1] series powder of uniform particles can be prepared. The ceramic powder is a functional material with a wide application range, and shows the advantages of high dielectric constant and low dielectric loss in a dielectric constant test. In particular, the dielectric loss is very small in the high frequency region, so the powder is expected to be applied in the high-frequency field.

Description

[0001] technical field [0002] The invention relates to a Ruddlesden-Popper (R-P) (Chinese translation is Raddlesden-Popper) homologous series compound powder, which has a layered perovskite structure and belongs to the technical field of ceramic powder preparation. Background technique [0003] ABOs 3 Type perovskite composite oxides are an important class of inorganic compounds and functional materials with a wide range of uses. In this class of inorganic compounds, SrTiO 3 As an important material in the electronics industry, it has the advantages of high dielectric constant, low dielectric loss, and good thermal stability. It can be used to manufacture degaussing components and automatic adjustment heating elements, ceramic sensitive components, microwave ceramic components, etc. Especially high quality SrTiO 3 The powder can be used to manufacture grain boundary layer capacitors, PTC thermistors and other components, and has the advantages of high performance, high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/47C04B35/622
Inventor 李壮志葛雯雯安和平霍艳寅朱春辉杨崇立唐贵德侯登录
Owner HEBEI NORMAL UNIV
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