Method for preparing calcium copper titanium oxide powder by sol-gel method

A calcium-copper-titanium oxide and compound technology is applied in the field of preparing calcium-copper-titanium oxide compound powder by the sol-gel method, which can solve problems such as high calcination temperature, large environmental pollution, and high cost of raw materials, and achieve good dispersion and reduce Pollution, the effect of uniform composition

Inactive Publication Date: 2012-10-31
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

[0003] In order to overcome the problems of high raw material cost, excessive environmental pollution and excessive calcination temperature in the prior art, the purpose of the present invention is to provide an improved sol-gel method to prepare CaCu 3 Ti 4 o 12 Powder, the prepared powder has uniform composition, good dispersibility, and relatively pure phase

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  • Method for preparing calcium copper titanium oxide powder by sol-gel method
  • Method for preparing calcium copper titanium oxide powder by sol-gel method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Calcium nitrate and copper nitrate of analytical grade are used to weigh the ingredients in a molar ratio of 1:3, dissolve in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 3 times the mass of the raw material to obtain a homogeneous solution (A solution). Based on the calcium nitrate added above, measure the corresponding amount of tetrabutyl titanate with a measuring cylinder according to the molar ratio of Ca:Ti of 1:4 and dissolve it in absolute ethanol. The volume of ethanol is 3 times the volume of tetrabutyl titanate. , fully stirred, so that tetrabutyl titanate is uniformly dissolved in absolute ethanol to form B liquid. Drop liquid A into liquid B at a rate of 4 ml per second, and stir while dripping at a speed of 100 rpm. After dripping liquid A, stir for 0.2 hours to obtain a sol; add deionized water Diluted ethanol, wherein the volume of deionized water is 1.0 times the volume of ethanol, and the volume added dropwise ...

Embodiment 2

[0017] Calcium nitrate and copper nitrate of analytical grade are used to weigh the ingredients in a molar ratio of 1:3, dissolve in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 8 times the mass of the raw material to obtain a homogeneous solution (A solution). Based on the calcium nitrate added above, measure the corresponding amount of tetrabutyl titanate with a graduated cylinder according to the molar ratio of Ca:Ti of 1:4 and dissolve it in absolute ethanol. The volume of ethanol is 12 times the volume of tetrabutyl titanate. , fully stirred, so that tetrabutyl titanate is uniformly dissolved in absolute ethanol to form B solution. Drop liquid A into liquid B at a rate of 10 ml per second, and stir while dripping at a stirring speed of 40 rpm. After dripping liquid A, stir for another 0.5 hours to obtain a sol; add deionized water Diluted ethanol, wherein the volume of deionized water is 2.0 times the volume of ethanol, and the vo...

Embodiment 3

[0019] Calcium nitrate and copper nitrate of analytical grade are used to weigh the ingredients in a molar ratio of 1:3, dissolve in ethylene glycol monomethyl ether, and the mass of ethylene glycol monomethyl ether is 12 times the mass of the raw material to obtain a homogeneous solution (A solution). Based on the calcium nitrate added above, measure the corresponding amount of tetrabutyl titanate with a graduated cylinder according to the molar ratio of Ca:Ti of 1:4 and dissolve it in absolute ethanol. The volume of ethanol is 6 times the volume of tetrabutyl titanate. , fully stirred, so that tetrabutyl titanate is uniformly dissolved in absolute ethanol to form B liquid. Drop liquid A into liquid B at a rate of 25 ml per second, and stir while dripping at a speed of 160 rpm. After dripping liquid A, stir for another 1.8 hours to obtain a sol; add deionized water Diluted ethanol, wherein the volume of deionized water is 0.5 times the volume of ethanol, the volume added dro...

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Abstract

The invention discloses a method for preparing calcium copper titanium oxide powder by the sol-gel method. The method comprises the steps of mixing tetrabutyl titanate, copper nitrate and calcium nitrate for forming CaCu3Ti4O12 according to the stoichiometric ratio, preparing solution, generating sol, generating gel, drying the gel, carrying out thermal treatment and finally preparing the calciumcopper titanium oxide powder with uniform ingredients, good dispersibility and pure phase. The method can greatly improve the ingredient uniformity of the calcium copper titanium oxide, save the production cost, reduce the synthesis temperature of the material, and further provide the technical assurance for preparing high-performance giant dielectric materials and pressure-sensitive materials.

Description

technical field [0001] The invention relates to the preparation of calcium copper titanium oxide compound powder by a sol-gel method, and belongs to the technical field of powder preparation. Background technique [0002] CaCu with perovskite structure 3 Ti 4 o 12 Has a very large dielectric constant (ε~10 4 -10 6 ) and lower loss (tanδ ~ 0.03), especially in a wide temperature range (100-600K) dielectric constant is almost unchanged. These good comprehensive properties make it possible to be widely used in a series of high-tech fields such as high-density energy storage, thin-film devices (such as MEMS, GB-DRAM), high-dielectric capacitors, and varistors. But to prepare CaCu with good performance 3 Ti 4 o 12 products, there must be CaCu with uniform composition 3 Ti 4 o 12 Powder. However, it is difficult to obtain powders with excellent properties by using traditional ceramic powder preparation methods. Literature "Yang Changhui, Zhou Xiaoli, Xu Gang, Han Gaor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/624
Inventor 刘来君吴枚霞方亮胡长征覃爱苗
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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