Shell-core structure ceramic material CaCu3Ti4O12 and preparation method thereof
A ceramic material, heat preservation and sintering technology, applied in the field of CaCu3Ti4O12 ceramic material and its preparation, can solve the problems of reduced dielectric loss, unmaintainable, high dielectric constant, etc., to reduce dielectric loss, improve dielectric constant, and preparation method simple effect
Inactive Publication Date: 2012-06-27
HARBIN INST OF TECH
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Problems solved by technology
[0004] The purpose of the invention is in order to solve existing CaCu 3 Ti 4 o 12 The problem that ceramic materials cannot maintain a high dielectric constant while reducing the dielectric loss
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specific Embodiment approach 1
[0016] Specific implementation mode 1: the shell-core structure CaCu of this implementation mode 3 Ti 4 o 12 Ceramic materials are composed of grains and grain boundaries, in which the grains are composed of CaCu 3 Ti 4 o 12 Composition, the grain boundaries are composed of Ca 1-x La x Cu 3 Ti 4 o 12 Composition, wherein x=0.1~0.5.
[0017] The shell-core structure CaCu of the present embodiment 3 Ti 4 o 12 The dielectric constant of ceramic materials reaches 9×10 3 , the dielectric loss reaches 0.3.
specific Embodiment approach 2
[0018] Embodiment 2: This embodiment differs from Embodiment 1 in that x=0.2˜0.4. Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0019] Embodiment 3: This embodiment differs from Embodiment 1 in that x=0.3. Other steps and parameters are the same as those in Embodiment 1.
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Abstract
The invention relates to a shell-core structure ceramic material CaCu3Ti4O12 and a preparation method thereof. The invention solves the problem that the current ceramic material CaCu3Ti4O12 can not maintain high dielectric constant while reducing dielectric losses. The ceramic material is composed of crystal particles and crystal boundaries, wherein the crystal particle consists of CCTO, the crystal boundary consists of Ga1-xLaxCu3Ti4O12, and x= 0.1-0.5. The preparation method of the invention comprises the following steps: 1, preparing CCTO sol; 2, preparing La-doped CCTO sol; 3, preparing CCTO powder crystal; 4, preparing the shell-core structure CCTO semi-finished product; and 5, preparing the shell-core structure ceramic material CCTO. In the invention, the dielectric constant of the ceramic material is up to 9*10<3>, and the dielectric loss is up to 0.3. The preparation method is simple, and can be applied to dielectric components of high-frequency capacitors.
Description
technical field [0001] The present invention relates to a kind of CaCu 3 Ti 4 o 12 Ceramic materials and methods for their preparation. Background technique [0002] CaCu 3 Ti 4 o 12 (CCTO) ceramics is a new type of high dielectric constant oxide functional material developed in the past ten years with broad application prospects. The low-frequency dielectric constant of the material is greater than 104 in the temperature range of 100-600K, and shows excellent temperature stability. Moreover, the crystal structure of CCTO is centrosymmetric (space group Im3), it is not a ferroelectric with inherent electric dipole moment, and the dielectric properties of ferroelectric materials will not change significantly near the ferroelectric-paraelectric phase transition temperature. Condition. However, the bottleneck that seriously limits the wide application of CCTO ceramics is its excessive dielectric loss. How to prepare CCTO ceramics with high dielectric constant and low di...
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IPC IPC(8): C04B35/462C04B35/628
Inventor 李伟力费维栋宋文韬赵瑜
Owner HARBIN INST OF TECH