Dielectric tunable barium-strontium titanate-based composite tungstate microwave dielectric material and preparation thereof

A technology of composite tungstate and barium strontium titanate, which is applied in the field of electronic materials and devices, can solve the problems that the research of microwave dielectric tunable characteristics has not been reported yet, and achieve the effects of low cost, broadened application range and simple process

Inactive Publication Date: 2010-03-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no related reports on the microwave dielectric tunable properties of barium strontium titanate composite tungstate materials

Method used

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  • Dielectric tunable barium-strontium titanate-based composite tungstate microwave dielectric material and preparation thereof
  • Dielectric tunable barium-strontium titanate-based composite tungstate microwave dielectric material and preparation thereof
  • Dielectric tunable barium-strontium titanate-based composite tungstate microwave dielectric material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 Preparation of High Q Electrically Adjustable 65% Ba 0.5 Sr 0.5 TiO 3 +35% ZnWO 4 ceramic dielectric material

[0041] respectively according to 65% Ba 0.5 Sr 0.5 TiO 3 +35% ZnWO 4 Molar ratio, weigh BaCO 3 , SrCO 3 、TiO 2 and ZnO, WO 3 Raw materials (as shown in Table 1).

[0042] Raw material source: BaCO 3 (99.8%, Alfa Aesar China LTD.), SrCO 3 (99.0%, Alfa Aesar ChinaLTD.), TiO 2 (99.9%, Foshan High-tech Inorganic Materials Co., Ltd.) and ZnO (99.99%, Sinopharm Chemical Reagent Co., Ltd.), WO 3 (99.8%, Alfa Aesar China LTD.)

[0043] Table 1. 65% Ba 0.5 Sr0.5TiO 3 +35% ZnWO 4 Raw material ratio of ceramic dielectric materials

[0044] formula

BaCO 3

SrCO 3

TiO 2

ZnO

WO 3

Mass / g

9.235

6.909

7.475

2.729

7.771

[0045] Put the above powder in a nylon ball mill jar, add zirconia balls and absolute ethanol or deionized water, ball mill for 24 hours, and pre-fire...

Embodiment 2

[0051] Example 2 Preparation of 65% Ba with high Q value and adjustable dielectric 0.5 Sr 0.5 TiO 3 +35% MgWO 4 ceramic dielectric material

[0052] respectively according to 65% Ba 0.5 Sr 0.5 TiO 3 +35% MgWO 4 Molar stoichiometric ratio, weigh BaCO 3 , SrCO 3 、TiO 2 and MgO, WO 3 Raw material (concrete quality is as shown in table 3).

[0053] Raw material source: BaCO 3 (99.8%, Alfa Aesar China LTD.), SrCO 3 (99.0%, Alfa Aesar ChinaLTD.), TiO 2 (99.9%, Foshan High-tech Inorganic Materials Co., Ltd.) and MgO (99.9%, Sinopharm Chemical Reagent Co., Ltd.), WO 3 (99.8%, Alfa Aesar China LTD.)

[0054] Table 3. 65% Ba 0.5 Sr 0.5 TiO 3 +35% MgWO 4 Raw material ratio of ceramic dielectric materials

[0055] formula

BaCO 3

SrCO 3

TiO 2

MgO

WO 3

Mass / g

9.235

6.909

7.475

1.555

8.945

[0056] Put the above powder in a nylon ball mill jar, add zirconia balls and absolute ethanol or deio...

Embodiment 3

[0062] Embodiment 3 prepares 85.0% Ba 0.6 Sr 0.4 TiO 3 +15.0% BaWO 4 ceramic dielectric material

[0063] According to 85.0% Ba respectively 0.6 Sr 0.4 TiO 3 +15.0% BaWO 4 Molar ratio, weigh BaCO 3 , SrCO 3 、TiO 2 and MgO, WO 3 raw material.

[0064] Raw material source: BaCO 3 (99.8%, Alfa Aesar China LTD.), SrCO 3 (99.0%, Alfa Aesar ChinaLTD.), TiO 2 (99.9%, Foshan High-tech Inorganic Materials Co., Ltd.) and WO 3 (99.8%, Alfa Aesar China LTD.)

[0065] Table 5.8 5.0% Ba 0.6 Sr 0.4 TiO 3 +15.0% BaWO 4 Raw material ratio of ceramic dielectric materials

[0066] formula

BaCO 3

SrCO 3

TiO 2

WO 3

Mass / g

14.382

9.035

9.775

2.709

[0067] Put the above powder in a nylon ball mill jar, add zirconia balls and absolute ethanol or deionized water, and mill for 24 hours. In the nylon ball mill jar, add zirconia balls and absolute ethanol or deionized water, ball mill for 24 hours, and the powde...

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Abstract

The invention belongs to the technical field of electronic materials and parts, particularly relates to a dielectric tunable barium-strontium titanate-based composite tungstate ceramic dielectric material and preparation thereof. The components of the dielectric tunable barium-strontium titanate-based composite tungstate ceramic dielectric material are as follows: (1-x%)Ba(1-y)SryTiO3 plus x%AWO4,wherein A is selected from Ba, Ca, Mg or Zn; the value range of x is that x% is more than 0wt% and less than 100wt%; and the value range of y is more than or equal to 0.4 and less than or equal to 0.6. The dielectric tunable barium-strontium titanate-based composite tungstate ceramic dielectric material has high Q value, low dielectric constant and a certain dielectric turnable ratio, and can bebroadly used for preparing tunable microwave devices such as electric tuning microwave resonators, filters, mirowave polyrod antennas and the like.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, in particular to a strontium barium titanate-based composite tungstate microwave dielectric material with adjustable dielectric 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 is the mai...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/495C04B35/622
Inventor 翟继卫张明伟张景基
Owner TONGJI UNIV
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