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Multiple phase ceramic material with adjustable dielectric

A complex-phase ceramic and dielectric technology, which is applied in the field of complex-phase ceramic materials, can solve the problems of mutual restriction between dielectric constant and dielectric tunability, which are not well solved, and achieve high dielectric tunable characteristics. , the effect of low cost and high dielectric tunability

Inactive Publication Date: 2010-09-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the contradiction between the dielectric constant and dielectric tunability of BST materials has not been well resolved.

Method used

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  • Multiple phase ceramic material with adjustable dielectric
  • Multiple phase ceramic material with adjustable dielectric
  • Multiple phase ceramic material with adjustable dielectric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 # ~4 # The weight of each raw material is shown in Table 1.

[0029] Table 1. (1-x-y)BaTiO 3 -ySrTiO 3 -xCaTiO 3 Multiphase ceramic material ratio and performance

[0030]

1#：y＝0，

x＝0.25

2#：y＝0.05，

x＝0.32

3#：y＝0.10，

x＝0.75

4#：y＝0.15，

x＝0.425

BaTiO 3

10.5063g

8.8253g

2.1013g

5.9536g

SrTiO 3

0

0.5511g

1.1022g

3.4710g

CaTiO 3

2.0417g

2.6134g

6.1252g

1.6533g

Final product

Molecular formula

Ba 0.79 Ca 0.21 TiO 3 -

Ba 0.09 Ca 0.91 TiO 3

Ba 0.65 Sr 0.05 Ca 0.30 TiO 3 -

Ba 0.09 Sr 0.05 Ca 0.86 TiO 3

Ba 0.56 Sr 0.10 Ca 0.34 TiO 3 -

Ba 0.16 Sr 0.10 Ca 0.74 TiO 3

Ba 0.47 Sr 0.15 Ca 0.38 TiO 3 -

Ba 0.18 Sr 0.15 Ca 0.67 TiO 3

Dielectric constant

ε r

795

669

178

Loss tanδ

0.024

0.0071

0.0019

Dielectric adjustable

Rate n r

(30kV / cm)

16％

45％

51％

[0031] Put the mixture of the above formulas into a nylon ball mill tank, add zirconia balls and absolute ethanol ball mill for 24...

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Abstract

The invention discloses complex phase ceramic material with adjustable dielectric property. The invention is characterized in that the component comprises two phases, wherein, the composing structural formula of the first phase is (Ba, Sr, Ca) TiO3, the content of each component is expressed according to the raw material that: (1-x-y)BaToO3-ySrTiO3-xCaTiO3, wherein, 0 is less than and equal to y which is less than and equal to 0.18, 0.21 is less than and equal to x which is less than and equal to 0.91 and the content of baric is bigger than the content of calcium; the composing structural formula of the second phase is (Ba, Sr, Ca)TiO3, the content of each component is expressed according to the raw material that: (1-x-y)BaTiO3-ySrTiO3-xCaTiO3, wherein, 0 is less than and equal to y whichis less than or equal to 0.18, and 0.21 is less than and equal to x which is less than and equal to 0.91. The content of calcium is bigger than the content of baric. The complex phase ceramic material with adjustable dielectric property disclosed in the invention has good dielectric capacity, small dielectric consumption, medium dielectric constant and much higher dielectric adjusting rate.

Description

Technical field [0001] The invention relates to a composite ceramic material with adjustable dielectric. Background technique [0002] Barium strontium titanate (Ba 1-x Sr x TiO 3 , Denoted BST) is a typical perovskite structure ferroelectric material, with high dielectric constant, low dielectric loss and excellent dielectric properties such as non-linear adjustable dielectric constant under the action of direct current electric field, and The Curie temperature can be continuously adjusted in a wide range with the Ba / Sr ratio. Therefore, BST ceramic materials have received more and more attention in microwave tunable devices, such as phase shifters, filters, variable capacitors, and delay lines. Especially as microwave phase shifter materials, it is currently a hot research topic. In 1994, the LCSengupta of the US National Military Research Laboratory Materials Department and the US Military Research Laboratory Microwave and Optoelectronics Department WCDrach were submitting to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/462C04B35/622
Inventor 王旭升张灵灵刘红翟继卫姚熹
Owner TONGJI UNIV
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