A kind of giant dielectric low-loss barium strontium titanate ceramic and preparation method thereof
A technology of barium strontium titanate and ceramics, which is applied in the field of giant dielectric low-loss strontium barium titanate ceramics and its preparation, can solve the problems of complex process, high energy consumption, and long preparation cycle, and achieve simple process and accelerated diffusion process , stable and reliable quality
Active Publication Date: 2020-05-05
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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Chinese invention patent application (application number: 201510708432.2) also discloses a sintering method of barium strontium titanate, which uses sol-gel method to prepare barium titanate powder and sinters at high temperature to prepare high dielectric constant ceramics , but the process of this method is relatively complicated. Not only the sol-gel method is used to prepare barium titanate powder, but also the muffle furnace is required for high-temperature sintering, the preparation cycle is longer, and the energy consumption is larger.
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[0043] Table 1
[0044]
[0045]
[0046] Based on the amount of raw materials in the above table 1, the ceramic sample BaTiO was obtained through the following preparation steps 3 、Ba 0.7 Sr 0.3 TiO 3 、Ba 0.8 Sr 0.2 TiO 3 、Ba 0.9 Sr 0.1 TiO 3 , the preparation steps are as follows:
[0047](1) SrCO 3 , BaCO 3 and TiO 2 Weigh the raw materials according to the amount shown in Table 1, according to the mass ratio of raw materials: agate ball mill: dehydrated alcohol is 1: 1.2: 1.2, the raw materials are ball milled for 16 hours, and the mixed powder is obtained after drying;
[0048] (2) heat the mixed powder obtained in step (1) at 1100° C. for 4 hours to obtain barium strontium titanate powder;
[0049] (3) According to the mass ratio Ba 1-x Sr x TiO 3 Powder: agate ball mill: absolute ethanol = 1:1.2:1.2 Ball-mill strontium-barium titanate powder for 16 hours, and dry the ball-milled slurry in an air atmosphere after passing through a 120-mesh sieve; th...
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Abstract
The invention discloses a giant dielectric low-loss barium strontium titanate ceramic. The chemical formula of the ceramic is Ba1-xSrxTiO3, wherein x is a mole number of Sr, and the range of x is thatx is more than or equal to 0 and less than or equal to 0.3. In addition, the invention also discloses a preparation method of the barium strontium titanate ceramic. The barium strontium titanate ceramic prepared by the method provided by the invention improves the dielectric constant of a barium titanate ceramic product, simultaneously reduces the loss of the barium titanate ceramic product, realizes a breakthrough of a barium titanate ceramic system, effectively improves the energy storage density and comprehensive performance of the barium titanate ceramic product, expands the application field of the barium strontium titanate ceramic product as a high-voltage energy storage dielectric material, and can greatly promote the popularization and application of materials of the system.
Description
technical field [0001] The invention relates to the technical field of functional materials, in particular to a giant dielectric low-loss barium strontium titanate ceramic and a preparation method thereof. Background technique [0002] With the development of science and technology, the miniaturization and miniaturization of various equipment put forward higher requirements for material performance, and various high dielectric and giant dielectric constant materials have been developed one after another. Barium titanate (BaTiO 3 ) is a tetragonal phase structure, which is a common ferroelectric material with excellent dielectric properties, but the dielectric loss of barium titanate ceramics is difficult to be greatly reduced by general technological means, thus limiting the further development of barium titanate materials. develop. Strontium titanate ceramics at room temperature have a cubic phase structure with high relative permittivity and low dielectric loss. Strontiu...
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IPC IPC(8): C04B35/465C04B35/626C04B35/64
CPCC04B35/465C04B35/62675C04B35/64C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567
Inventor 郭旺黄集权江亚彬李国京黄秋凤邓种华陈剑刘著光兰海
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI