Barium strontium titanate dielectric material for microwave tuning device

A technology of barium strontium titanate and dielectric materials, which is applied in the field of barium strontium titanate dielectric materials for microwave tuning devices, and can solve problems such as limiting the application of BST materials, high dielectric loss, dielectric adjustability, and other electrical performance declines , to achieve controllable cost, high dielectric constant, and improved dielectric performance

Active Publication Date: 2018-04-20
SUNWAY COMM JIANGSU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Embodiment 1

[0024] Embodiment one of the present invention is:

[0025] A strontium barium titanate dielectric material for microwave tuning devices, the chemical formula of the strontium barium titanate dielectric material is (Ba x Sr 1-x ) 1+δ TiO 3 , where x=0.2~0.4, δ=-0.02~0.02. Preferably, x=0.4, δ=-0.02~-0.002. figure 1 The XRD pattern of the BST material of this example, from figure 1 It can be seen that the diffraction peak near 45° is a single peak shape, and there is no phenomenon of splitting peaks, indicating that the BST material has a single cubic perovskite structure. figure 2 The SEM image of the BST material of this example is obtained 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, including:

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

[0029] (2) Using absolute ethanol as the ball-milling medium, the weighed raw materials were added to the ball-milling tank, and the horizontal wet ball-milling process was used for mixing and ball-milling for 24 hours. After discharging, 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) adding a polyvinyl alcohol (PVA) aqueous solution accounting for 2wt% of the mass of the powder to the BST ceramic powder obtained in step (2) for granulation, after passing through an 80-mesh sieve, under a uniaxial pressure of 175MPa, the BST ceramic green body was obtained. Then, the ceramic body was kept at 600°C for 2 hours for deb...

Embodiment 3

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

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

[0034] (2) Using absolute ethanol as the ball-milling medium, the weighed raw materials were added to the ball-milling tank, and the horizontal wet ball-milling process was used for mixing and ball-milling for 24 hours. After discharging, 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) adding a polyvinyl alcohol (PVA) aqueous solution accounting for 2wt% of the mass of the powder to the BST ceramic powder obtained in step (2) for granulation, after passing through an 80-mesh sieve, under a uniaxial pressure of 175MPa, the BST ceramic green body was obtained. Then, the ceramic body was kept at 600°C for 2 hours for deb...

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Abstract

The invention discloses a barium strontium titanate dielectric material for a microwave tuning device, and the barium strontium titanate dielectric material has the chemical general formula of (BaxSr1-x)1+[delta]TiO3, wherein x=0.2-0.4, and delta=-0.02-0.02. With distinction between traditional BST material systems with high dielectric constant but generally low quality factors, the BST material has high dielectric constant and high quality factors while maintaining high dielectric tunability, and can greatly improve dielectric properties of the BST material on the microwave tuning device. TheBST material can achieve good material properties without doping or addition of other elements or physical phases, and is controllable in cost and easy to prepare.

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, the research on microwave tuning devices, especially microwave phase shifters and their materials, has been paid more and more attention by developed countries such as the United States and Japan. (Ba,Sr)TiO 3 (BST for short) materials have become the most widely used in the field of military and civilian microwave tuning devices, especially microwave phase shifters due to their high dielectric tunability, low dielectric loss and moderate dielectric constant. Material systems of interest. L.C.Sengupta and others of the National Military Research Laboratory of the United States clearly pointed out in the investigation report submitted to the government department that if the BST material can replace the ferrite in the phase shifter, the phased...

Claims

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Application Information

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Patent Type & Authority Applications(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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