Method for preparing copper titanate calcium-based ceramic with core-shell structure

A technology of calcium copper titanate and shell structure is applied in the field of preparation of calcium copper titanate-based ceramics, which can solve the problems of low-frequency dielectric constant reduction of CCTO ceramics, and achieve the advantages of reducing dielectric loss, increasing insulation and improving oxidation degree. Effect

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 reducing the low-frequency dielectric loss of CCTO ceramics, the present invention provides a method for preparing copper calcium titanate-based ceramics with a core-shell structure

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  • Method for preparing copper titanate calcium-based ceramic with core-shell structure

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[0011] 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 precursor 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 xerogel was calcined in the atmosphere at 750°C for 2 hours to obtain CCTO powder. Next follow CCTO / xMgTiO 3 (x=0, 0.5, 1 and 2) stoichiometric ratio Accurately weigh CCTO powder, magnesium nitrate (Mg(NO ...

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Abstract

The invention relates to a method for preparing dielectric ceramic materials and in particular relates to a method for preparing a copper titanate calcium-based ceramic with a core-shell structure. The method for preparing the copper titanate calcium-based ceramic with the core-shell structure comprises the following steps: (1) taking calcium nitrate, copper nitrate and tetrabutyl titanate as initial raw materials, adding citric acid, and preparing CCTO powder by utilizing a sol-gel method; (2) accurately weighing the CCTO powder, magnesium nitrate and tetrabutyl titanate according to a stoichiometric ratio of CCTO / xMgTiO3, weighing the citric acid, fully stirring the materials in ethanol, forming suspension, and finally obtaining CCTO / MgTiO3 mixed powder; and (3) fully grinding the 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 / xMgTiO3 ceramic.

Description

technical field [0001] The invention relates to a preparation method of dielectric ceramics, in particular to a preparation method of 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-frequency dielectric loss i...

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Application Information

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IPC IPC(8): C04B35/465C04B35/628
CPCC04B35/465C04B35/62805C04B35/62886C04B2235/443C04B2235/48
Inventor 郝文涛孙礼杨帅王明文吴辉曹恩思张雍家
Owner TAIYUAN UNIV OF TECH
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