Tunable dielectric barium strontium titanate based composite silicate microwave dielectric material and preparation thereof

A composite silicate and barium strontium titanate technology, which is applied to ceramics, inorganic insulators, etc., to achieve the effect of simple process, low cost, and broadened application range

Inactive Publication Date: 2011-01-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall performance of the system needs to be further improved
Research on microwave dielectric tunable properties of barium strontium titanate composite silicate materials has not been reported yet

Method used

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  • Tunable dielectric barium strontium titanate based composite silicate microwave dielectric material and preparation thereof
  • Tunable dielectric barium strontium titanate based composite silicate microwave dielectric material and preparation thereof
  • Tunable dielectric barium strontium titanate based composite silicate microwave dielectric material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1 Preparation of 40% Ba with high Q value and adjustable dielectric 0.5 Sr 0.5 TiO 3 +60% (Sr 0.5 Ba 0.5 ) 2 ZnSi 2 o 7 ceramic dielectric material

[0037] respectively according to 40% Ba 0.5 Sr 0.5 TiO 3 +60%BaSrZnSi 2 o 7 Molar ratio, weigh BaCO 3 , SrCO 3 、TiO 2 and ZnO, SiO 2 raw materials (as shown in Table 1).

[0038] Raw material source: BaCO 3 (99.8%, Alfa Aesar China LTD.), SrCO 3 (99.0%, Alfa Aesar China LTD.), TiO 2 (99.9%, Foshan High-tech Inorganic Materials Co., Ltd.) and ZnO (99.99%, Sinopharm Chemical Reagent Co., Ltd.), SiO 2 (99.9%, Sinopharm Chemical Reagent Co., Ltd.).

[0039] Table 1. 40% Ba 0.5 Sr 0.5 TiO 3 +60%BaSrZnSi 2 o 7 Raw material ratio of ceramic dielectric materials

[0040] formula

BaCO 3

SrCO 3

TiO 2

ZnO

SiO 2

Mass / g

13.459

10.148

4.605

3.196

4.722

[0041] The above powder according to Ba 0.5 Sr 0.5 TiO 3 and BaSrZnSi ...

Embodiment 2

[0047] Example 2 Preparation of 60% Ba with high Q value and adjustable dielectric 0.4 Sr 0.6 TiO 3 +40% (Sr 0.4 Ba 0.6 ) 2 (Zn 0.95 co 0.05 ) Si 2 o 7 ceramic dielectric material

[0048] According to 60% Ba respectively 0.4 Sr 0.6 TiO 3 +40% (Sr 0.4 Ba 0.6 ) 2 (Zn 0.95 co 0.05 ) Si 2 o 7 Molar stoichiometric ratio, weigh BaCO 3 , SrCO 3 、TiO 2 and ZnO, Co 2 o 3 , SiO2 Raw material (concrete quality is as shown in table 3).

[0049] Raw material source: BaCO 3 (99.8%, Alfa Aesar China LTD.), SrCO 3 (99.0%, Alfa Aesar China LTD.), TiO 2 (99.9%, Foshan High-tech Inorganic Materials Co., Ltd.) and ZnO (99.9%, Sinopharm Chemical Reagent Co., Ltd.), Co 2 o 3 (99.9%, Sinopharm Chemical Reagent Co., Ltd.), SiO 2 (99.9%, Sinopharm Chemical Reagent Co., Ltd.).

[0050] Table 3. 60% Ba 0.4 Sr 0.6 TiO 3 +40% (Sr 0.4 Ba 0.6 ) 2 (Zn 0.95 co 0.05 ) Si 2 o 7 Raw material ratio of ceramic dielectric materials

[0051] formula

BaCO 3

...

Embodiment 3

[0058] Example 3 Preparation of High Q Electrically Adjustable 50% Ba 0.5 Sr 0.5 TiO 3 +50% (Sr 0.9 Ca 0.1 ) 2 (Zn 0.5 Mg 0.5 ) Si 2 o 7 ceramic dielectric material.

[0059] According to 50% Ba respectively 0.5 Sr 0.5 TiO 3 +50% (Sr 0.9 Ca 0.1 ) 2 (Zn 0.5 Mg 0.5 ) Si 2 o 7 Molar ratio, weigh BaCO 3 , SrCO 3 、TiO 2 and ZnO, MgO, SiO 2 Raw materials (as shown in Table 5).

[0060] Raw material source: BaCO 3 (99.8%, Alfa Aesar China LTD.), SrCO 3 (99.0%, Alfa Aesar China LTD.), TiO 2 (99.9%, Foshan High-tech Inorganic Materials Co., Ltd.) and ZnO (99.99%, Sinopharm Chemical Reagent Co., Ltd.), MgO (99.9%, Sinopharm Chemical Reagent Co., Ltd.), SiO 2 (99.9%, Sinopharm Chemical Reagent Co., Ltd.).

[0061] Table 5.50% Ba 0.5 Sr 0.5 TiO 3 +50% (Sr 0.9 Ca 0.1 ) 2 (Zn 0.5 Mg 0.5 ) Si 2 o 7 Raw material ratio of ceramic dielectric materials

[0062] formula

BaCO 3

SrCO 3

TiO 2

ZnO

MgO

SiO 2

Mass / g ...

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Abstract

The invention belongs to the technical field of electronic materials and devices, and discloses a tunable dielectric barium strontium titanate based composite silicate ceramic dielectric material and preparation thereof. The tunable dielectric barium strontium titanate based composite silicate ceramic dielectric material has a component formula of (1-m%)Ba1-zSrzTiO3+m%(Sr1-xAx)2(Zn1-yBy)Si2O7, wherein A is selected from Ba or Ca; B is selected from Co, Mg, Mn or Ni; the numerical value range of x is not smaller than 0 and not more than 1; the numerical value range of y is not smaller than 0 and not more than 1; the numerical value range of z is not smaller than 0.4 and not more than 0.6; and the numerical value range of m% is more than 0wt% and smaller than 100wt%. The tunable dielectric barium strontium titanate based composite silicate ceramic dielectric material of the invention is high in Q (Quality) value, low in dielectric constant and high in dielectric tunable rate, and can bewidely applied to preparation of tunable microwave elements and devices such as electric tuning microwave tuners, filters, microwave dielectric antennae and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a dielectrically adjustable strontium barium titanate-based composite silicate microwave dielectric material and its preparation. Background technique [0002] The ferroelectric material with perovskite structure strontium barium titanate with high dielectric constant, low dielectric loss, non-linear tunable dielectric constant and tunable Curie temperature is used as a microwave tunable device (such as phase shifter, filter devices, variable capacitors and delay lines, etc.) have received increasing attention, especially as a microwave phase shifter is a current research hotspot. However, the BST ceramic material with high dielectric constant is difficult to meet the requirements of internal impedance matching and high power of the excitation source, which greatly limits its application in the field of microwave tunable devices. The Q value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/47C04B35/16C04B35/622H01B3/12
Inventor 翟继卫张明伟沈波
Owner TONGJI UNIV
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