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Preparation method of TiO2-excessive high-dielectric-tunability ceramic (Ba,Sr)TiO3

A high-dielectric and ceramic technology, which is applied in the field of special ceramic preparation for wireless communication technology, can solve the problems of poor temperature stability of dielectric constant, unstable dielectric performance, and affecting normal operation of devices, and achieves low manufacturing cost and excellent preparation process. Simple, realize the effect of industrial scale production

Inactive Publication Date: 2013-08-07
SHANGHAI UNIV
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Problems solved by technology

GuoxinHu et al prepared the Curie temperature near room temperature Ba 0.6 Sr 0.4 TiO 3 –MgAl 2 o 4 Ceramics, research results show 70wt%Ba 0.6 Sr 0.4 TiO 3 –30wt%MgAl 2 o 4 The maximum tuning rate of ceramics is 23.63% (1KV / mm), but the temperature stability of the dielectric constant is poor, and the dielectric properties are unstable, which affects the normal operation of the device

Method used

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  • Preparation method of TiO2-excessive high-dielectric-tunability ceramic (Ba,Sr)TiO3
  • Preparation method of TiO2-excessive high-dielectric-tunability ceramic (Ba,Sr)TiO3
  • Preparation method of TiO2-excessive high-dielectric-tunability ceramic (Ba,Sr)TiO3

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Embodiment

[0025] The preparation process and steps in this embodiment are as follows:

[0026] (A), TiO 2 Excess (Ba,Sr)TiO 3 Preparation of miscible powders

[0027] a. With BaCO 3 , SrCO 3 (analytical purity ≧ 99%) and TiO 2 (chemically pure ≧ 98%) as the raw material, weigh BaCO according to the stoichiometric ratio of BT and ST 1:1 3 、TiO 2 and SrCO 3 、TiO 2 Put it into the ball mill jar; add appropriate amount of deionized water, absolute ethanol and zirconia ball mills of different diameters and shapes, the ratio of ball to material is 2:1, and the liquid level occupied by deionized water and absolute ethanol is about It is 2 / 3 of the height of the entire ball mill jar, the speed of the ball mill jar is 50 rpm, and the milling time is 24 hours;

[0028] b. Take out the ball-milled slurry, dry at 120°C, grind and sieve to obtain a uniform fine powder; place the powder in a sintering furnace for calcination, and calcinate at 1100°C for two hours to synthesize BT powder, a...

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Abstract

The invention relates to a preparation method of (Ba,Sr)TiO3 (BST) ceramic having high tunability and high temperature stability, belonging to the technical field of preparation of special ceramics for a wireless communication technology. The BST ceramic is prepared by taking BaCO3, TiO2 and SrCO3 as raw materials, combining a solid-phase reaction method, an ice bath ultrasonic method and a sol-permeable auxiliary sintering technology, adding TiO2 into a BaTiO3 / SrTiO3 mixed-phase biscuit and sintering at a low sintering temperature (1280 DEG C); and the tunability of the BST ceramic is 36.9% (room temperature / 10KHz), the dielectric loss is less than 0.03 (room temperature / 100Hz-10MHz), and the BST ceramic has high temperature stability. The invention provides a feasible method for preparing BST dielectric ceramic having high tunability and high temperature stability, which is simple in process, low in production cost and easy to realize mass production.

Description

technical field [0001] The invention relates to a dielectric tuning (Ba, Sr)TiO for preparing microwave devices with high tuning rate and high temperature stability 3 The new technology of dielectric ceramics belongs to the technical field of preparation of special ceramics for wireless communication technology. Background technique [0002] The dielectric constant of barium strontium titanate (BST) material can change with the applied electric field. It is a main research material that can be applied to the dielectric adjustment under microwave. It is used in the phase shifter in phased array antenna system / radar and It has potential application prospects in tunable oscillators and tunable filters in microwave wireless communication systems. The performance requirements of these applications for BST ceramics are: high tuning capacity, high temperature stability, low loss and suitable dielectric coefficient. Improving the dielectric tuning rate, temperature stability, and ...

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Application Information

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IPC IPC(8): C04B35/468C04B35/622
Inventor 金灯仁周立新谢朝军董汉莛
Owner SHANGHAI UNIV
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