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Method for preparing high-dielectric low-loss copper titanate calcium-based ceramic with core-shell structure

A technology of copper calcium titanate and shell structure, which is applied in the field of high-dielectric and low-loss copper calcium titanate-based ceramics, can solve the problem of low-frequency dielectric constant reduction and achieve the effect of reducing dielectric loss

Inactive Publication Date: 2017-09-29
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] In order to solve the technical problem that the low-frequency dielectric constant of CCTO ceramics is greatly reduced when the low-frequency dielectric loss is reduced, the present invention provides a method for preparing high-dielectric and low-loss copper-calcium titanate-based ceramics with a core-shell structure

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  • Method for preparing high-dielectric low-loss copper titanate calcium-based ceramic with core-shell structure
  • Method for preparing high-dielectric low-loss copper titanate calcium-based ceramic with core-shell structure

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[0014] To analyze pure calcium nitrate (Ca(NO 3 ) 2 • 4H 2 O, 99%), copper nitrate (Cu(NO 3 ) 2 •3H 2 O, 99%) and tetrabutyl titanate ([CH 3 (CH 2 ) 3 O] 4 Ti, 99%) as the initial raw material, adding citric acid (C 6 h 8 o 7 , 99%), the CCTO powder was prepared by the sol-gel method, first according to the CaCu 3 Ti 4 o 12 The stoichiometric ratio of various raw materials is accurately weighed, then dissolved in ethanol and mixed evenly, and the pH of the solution is only adjusted to 2~3 with nitric acid. After the solution was stirred by magnetic force, it was placed in a constant temperature of 80°C and incubated for 6 hours to make the solution form a colloid, and then kept in a constant temperature of 100°C for 2 hours to become a xerogel. The dry gel was calcined in the atmosphere at 750°C for 2 hours to obtain the CCTO precursor powder. Followed by CCTO / xTiO 2 (x=0, 0.5, 1 and 2) stoichiometric ratio Accurately weigh CCTO powder, tetrabutyl titanate and ...

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Abstract

The invention relates to a method for preparing dielectric ceramics and in particular relates to a method for preparing a high-dielectric low-loss copper titanate calcium-based ceramic with a core-shell structure. The technical problem that the low-frequency dielectric constant is greatly reduced when low frequency dielectric loss of copper calcium titanate (CCTO) ceramics is reduced at present is solved. The method for preparing the high-dielectric low-loss copper titanate calcium-based ceramic with the core-shell structure comprises the following steps: (1) taking calcium nitrate, copper nitrate and tetrabutyl titanate as raw materials, adding citric acid, and preparing CCTO powder by utilizing a sol-gel method; (2) weighing the CCTO powder and tetrabutyl titanate according to a stoichiometric ratio of CCTO / xTiO2, adding the citric acid, and preparing the CCTO / TiO2 mixed powder by utilizing the sol-gel-like method; and (3) fully grinding the mixed powder, pressing into sheets under the pressure of 150 MPa, sintering at the temperature of 1080 DEG C for 10 hours, thereby obtaining the CCTO / xTiO2 ceramic.

Description

technical field [0001] The invention relates to a method for preparing dielectric ceramics, in particular to a method for preparing high-dielectric and low-loss copper-calcium titanate-based ceramics with a core-shell structure. Background technique [0002] High dielectric constant materials provide the possibility to realize the miniaturization and high performance of important electronic devices such as filters, resonators, memories and capacitors, and have received extensive attention. Calcium copper titanate (CaCu 3 Ti 4 o 12 , CCTO) is a more typical and representative high-dielectric material discovered in the past few years, whether it is a single crystal or a ceramic, it has a high dielectric strength of up to 10 4 The dielectric constant, the dielectric constant basically remains unchanged in a wide frequency range (10 Hz ~ 100 kHz) and a wide temperature range (100 ~ 350 K). However, while CCTO ceramics have a high low-frequency dielectric constant, their low-...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/465C04B35/628
CPCC04B35/465C04B35/62805C04B35/62886C04B2235/443C04B2235/48C04B2235/96
Inventor 郝文涛孙礼吴辉王明文杨帅曹恩思张雍家
Owner TAIYUAN UNIV OF TECH
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