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Barium strontium titanate dielectric material for microwave tuning devices

A technology of barium strontium titanate and a dielectric material is applied in the field of barium strontium titanate dielectric materials for microwave tuning devices, and can solve the problems of dielectric tunability and other electrical properties decline, high dielectric loss, limiting the application of BST materials, etc. , to achieve the effect of improving dielectric properties, high dielectric constant, and cost controllable

Active Publication Date: 2021-08-03
SUNWAY COMM JIANGSU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, BST materials have high dielectric loss at microwave frequencies, and there is a very obvious mutual constraint relationship between their high dielectric constant and high tunability and quality factor (that is, the reciprocal of dielectric loss), which greatly limits the use of BST materials. Application of Materials in the Field of Microwave Tuning
[0004] In order to improve the dielectric properties of BST materials, it is generally modified by element doping or oxide compounding. Although this method can effectively reduce the dielectric loss of the material, it will inevitably lead to dielectric loss. Tonality and other electrical performance degradation

Method used

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  • Barium strontium titanate dielectric material for microwave tuning devices
  • Barium strontium titanate dielectric material for microwave tuning devices
  • Barium strontium titanate dielectric material for microwave tuning devices

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Embodiment 1

[0024] Embodiment one of the present invention is:

[0025] A kind of strontium barium titanate dielectric material for microwave tuning device, the chemical general formula of described strontium barium titanate dielectric material is (Ba x Sr 1-x ) 1+δ TiO 3 , wherein x=0.2~0.4, δ=-0.02~0.02. Preferably, x=0.4, δ=-0.02˜-0.002. figure 1 Be the XRD collection of illustrative plates of the BST material of the present embodiment, from figure 1 It can be seen that the diffraction peak around 45° is in the shape of a single peak, and there is no phenomenon of peak splitting, indicating that the BST material is a single cubic perovskite structure. figure 2 Be the SEM picture of the BST material of the present embodiment, by figure 2 It can be seen that the BST material has a single grain shape, the grain growth is intact, and no obvious impurity phase is observed inside the grain and at the grain boundary.

Embodiment 2

[0027] Embodiment 2 of the present invention is the preparation method of BST material, comprising:

[0028] (1) with (Ba 0.4 Sr 0.6 ) 0.98 TiO 3 The chemical formula composition weighs BaTiO respectively 3 (purity 99.5%) and SrTiO 3 (purity 99.5%) raw material.

[0029] (2) Using absolute ethanol as the ball milling medium, add the weighed raw materials into a ball milling tank, and adopt horizontal wet ball milling process to mix and ball mill for 24 hours. After discharge, it is dried in an oven at 80°C, and then pre-fired in a muffle furnace at 1150°C for 2 hours to obtain BST ceramic powder.

[0030] (3) in the BST ceramic powder that obtains in step (2), add the polyvinyl alcohol (PVA) aqueous solution that accounts for powder quality 2wt% and carry out granulation, after crossing 80 mesh sieves, under the uniaxial pressure of 175MPa, make Get BST ceramic green body. Then the ceramic green body was kept at 600°C for 2 hours for debinding, and then sintered at 140...

Embodiment 3

[0032] Embodiment 3 of the present invention is the preparation method of BST material, comprises:

[0033] (1) with (Ba 0.4 Sr 0.6 ) 0.99 TiO 3 The chemical formula composition weighs BaTiO respectively 3 (purity 99.5%) and SrTiO 3 (purity 99.5%) raw material.

[0034] (2) Using absolute ethanol as the ball milling medium, add the weighed raw materials into a ball milling tank, and adopt horizontal wet ball milling process to mix and ball mill for 24 hours. After discharge, it is dried in an oven at 80°C, and then pre-fired in a muffle furnace at 1150°C for 2 hours to obtain BST ceramic powder.

[0035] (3) in the BST ceramic powder that obtains in step (2), add the polyvinyl alcohol (PVA) aqueous solution that accounts for powder quality 2wt% and carry out granulation, after crossing 80 mesh sieves, under the uniaxial pressure of 175MPa, make Get BST ceramic green body. Then the ceramic green body was kept at 600°C for 2 hours for debinding, and then sintered at 1400...

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Abstract

The invention discloses a barium strontium titanate dielectric material for a microwave tuning device. The general chemical formula of the barium strontium titanate dielectric material is (Ba x Sr 1‑x ) 1+δ TiO 3 , where x=0.2~0.4, δ=-0.02~0.02. Different from the traditional BST material system with high dielectric constant and generally low quality factor, the BST material of the present invention has high dielectric constant and high quality factor while maintaining high dielectric tunability, which can greatly improve The dielectric performance of the BST material on microwave tuning devices, the BST material of the present invention can achieve better material performance without doping or adding other elements or phases, and its cost is controllable and easy to manufacture.

Description

technical field [0001] The invention relates to the technical field of microwave tuners, in particular to a barium strontium titanate dielectric material for microwave tuning devices. Background technique [0002] Since the mid-1990s, research on microwave tuning devices, especially microwave phase shifters and their materials, has been increasingly valued by developed countries such as the United States and Japan. (Ba,Sr)TiO 3 (abbreviated as BST) material, because of its high dielectric tunability, low dielectric loss and moderate dielectric constant, it has become the most widely used in the field of military and civil microwave tuning devices, especially microwave phase shifters. Concerned material system. L.C.Sengupta and others of the National Military Research Laboratory of the United States clearly pointed out in the survey report submitted to the government that if BST materials can replace ferrite and be used in phase shifters, phased array radar will usher in a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622C04B35/638
CPCC04B35/4682C04B35/622C04B35/638C04B2235/3213C04B2235/6567C04B2235/77
Inventor 宋喆虞成城
Owner SUNWAY COMM JIANGSU CO LTD
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