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Preparation method of calcium, copper, titanium lanthanum oxygen dielectric ceramic powder

A technology of dielectric ceramics and calcium copper titanium, which is applied in the field of preparation of calcium copper titanium lanthanum oxygen dielectric ceramic powder, can solve the problems of low density, poor performance, high dielectric loss, etc., and achieve flat dielectric constant and improved Dielectric performance, the effect of smooth dielectric loss

Inactive Publication Date: 2007-04-18
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional method of preparing high dielectric constant ceramic oxide powder is generally mechanical grinding. The powder prepared by this method has large particles, uneven composition, high sintering temperature, uneven grain growth, low density and Its disadvantages such as poor repeatability
These factors lead to low yield and poor performance of subsequent dielectric ceramic materials
The Chinese invention patent application specification No. 200610049584.7 published on July 26, 2006 discloses a preparation method of calcium-copper-titanium-lanthanum-oxygen dielectric ceramics. Although the materials on microelectronic devices such as capacitors and various thin film devices have a huge dielectric constant, the problem of high dielectric loss makes it reduce the dielectric loss while maintaining a high dielectric constant, and its dielectric The temperature range where the electrical constant is constant is also widened by the method of the invention
However, the method of this invention is the same as most of the currently used ceramic powder preparation methods. The raw materials need to be ground and then calcined at high temperature, so the powder is very easy to agglomerate, and the operating conditions are very strict.

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  • Preparation method of calcium, copper, titanium lanthanum oxygen dielectric ceramic powder
  • Preparation method of calcium, copper, titanium lanthanum oxygen dielectric ceramic powder
  • Preparation method of calcium, copper, titanium lanthanum oxygen dielectric ceramic powder

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Embodiment 1

[0013] Embodiment one: 1. by chemical formula CaCu 3 Ti 4 o 12 Weigh calcium nitrate, copper nitrate and butyl titanate as raw materials respectively, and the molar ratio of Ca, Cu and Ti is 1:3:4; ② Dissolve calcium nitrate and copper nitrate in absolute ethanol; ③ Dissolve butyl titanate Dissolve the ester in absolute ethanol, quickly add glacial acetic acid, the volume ratio of butyl titanate to glacial acetic acid is 4:1, after mixing evenly, add a certain amount of concentrated nitric acid and deionized water to control the pH value at about 4.5; ④ Slowly mix the solutions prepared in ② and ③, stir fully to make the reaction complete, then add citric acid in the solution, the ratio of the total number of moles of metal ions in the solution system to citric acid is 1: 1.5; ⑤ Stir the mixed solution for 4 hours, as the hydrolysis and polymerization proceed, a blue-green transparent sol is formed, and the sol liquid is placed in a drying oven at 40°C for 20 hours to obtain...

Embodiment 2

[0014] Embodiment two: 1. by chemical formula Ca 1-χ La 2χ / 3 Cu 3 Ti 4 o 12 Weigh calcium nitrate, lanthanum nitrate, copper nitrate and butyl titanate respectively as raw materials, the molar ratio of Ca, La, Cu, Ti is 1-χ:2χ / 3:3:4, χ=0.05; ②Calcium nitrate , copper nitrate and lanthanum nitrate are mixed and dissolved in absolute ethanol; ③ dissolve butyl titanate in absolute ethanol, quickly add glacial acetic acid, the volume ratio of butyl titanate to glacial acetic acid is 3.5:1, and mix well Finally, add a certain amount of concentrated nitric acid and deionized water to control the pH value at about 4; ④ Slowly mix the solutions prepared in ② and ③, stir fully to make the reaction complete, then add citric acid to the solution, and add citric acid to the solution. The ratio of the total number of moles of metal ions in the system to citric acid is 1:1.7; ⑤Stir the mixture for 5 hours, and as the hydrolysis and polymerization proceed, a blue-green transparent sol is...

Embodiment 3

[0015] Embodiment three: 1. by chemical formula Ca 1-χ La 2χ / 3 Cu 3 Ti 4 o 12 Weigh calcium nitrate, lanthanum nitrate, copper nitrate and butyl titanate respectively as raw materials, the molar ratio of Ca, La, Cu, Ti is 1-χ:2χ / 3:3:4, χ=0.10; ②Calcium nitrate , copper nitrate and lanthanum nitrate are mixed and dissolved in absolute ethanol; ③ dissolve butyl titanate in absolute ethanol, quickly add glacial acetic acid, the volume ratio of butyl titanate to glacial acetic acid is 4.5:1, and mix well Finally, add a certain amount of concentrated nitric acid and deionized water to control the pH value at about 5; ④ Slowly mix the solutions prepared in ② and ③, stir fully to make the reaction complete, then add citric acid in the solution, The ratio of the total number of moles of metal ions in the system to citric acid is 1:2.0; ⑤ Stir the mixed solution for 3 hours, as the hydrolysis and polymerization reactions proceed, a blue-green transparent sol is formed, and the sol ...

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Abstract

The present invention discloses a preparation method of calcium copper titanium lanthanum oxygen dielectric ceramic powder body. It is characterized by that it uses nitrate of Ca, La and Cu and butyl titanate as main raw material to prepare powder body whose general formula is Ca1-xLa2x / 3Cu3Ti4O12, in which x=0.00-0.20. Said invention utilizes sol-gel method to prepare Ca1-xLa2x / 3Cu3Ti4O12 dried gel, then adopts citric acid combustion method to make said gel into the invented powder body.

Description

technical field [0001] The invention relates to a ceramic with a high dielectric constant, in particular to a method for preparing a calcium-copper-titanium-lanthanum-oxygen dielectric ceramic powder. Background technique [0002] At present, high dielectric constant materials are a research hotspot in the microelectronics industry. The degree of miniaturization of electronic devices depends on the size and performance of the material's dielectric constant; in addition, some devices with special properties can be realized by using the characteristics of high dielectric constant, such as high-density energy storage capacitors. Calcium copper titanium oxide (CaCu 3 Ti 4 o 12 ) Ceramics have excellent electrical properties, high dielectric constant and low dielectric loss, and are expected to be widely used in the field of microelectronics. However, in practical applications, people generally hope that these materials not only have high dielectric constant characteristics, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01L41/187H10N30/853
Inventor 夏海平金淑华张约品
Owner NINGBO UNIV