Composite ceramic material in use for microwave device with adjustable dielectric

A technology of microwave devices and composite ceramics, applied in piezoelectric/electrostrictive/magnetostrictive devices, electrical components, circuits, etc., to achieve the effect of broadening the application range, improving the withstand voltage characteristics, and reducing the cost

Inactive Publication Date: 2007-10-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the dielectric constant and dielectric tunability of BZT perovskite ceramic materials are mutually restricted, so how to develop materials with both moderate dielectric constant and high dielectric tunability is a technical difficulty

Method used

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  • Composite ceramic material in use for microwave device with adjustable dielectric
  • Composite ceramic material in use for microwave device with adjustable dielectric
  • Composite ceramic material in use for microwave device with adjustable dielectric

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0029] Preparation of BaZr 0.35 Ti 0.65 o 3 -Mg 2 TiO 4 Composite ceramic materials:

[0030] According to BaZr 0.35 Ti 0.65 o 3 The stoichiometric ratio, weigh an appropriate amount of BaCO 3 , ZrO 2 and TiO 2 Put the powder in a nylon ball mill jar, add zirconia balls and absolute ethanol or deionized water, mill for 24 hours, and pre-calcine at 1200°C for 4 hours after the discharge is dried, and BaZr is obtained after grinding. 0.35 Ti 0.65 o 3 The powder is ready for use.

[0031] Weigh the chemical reagents according to the proportion of the composite components in Table 1 below:

[0032] formula

1 #

2 #

3 #

4 #

BYZGR 0.35 Ti 0.65 o 3

1.0g

2.0g

4.0

8.0

Mg 2 TiO 4

19.0g

18.0g

16.0

12.0

[0033] Put the mixed materials of the above formulas into nylon ball milling tanks respectively, add 21g of zirconia balls and 40g of absolute ethanol, mill fo...

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Abstract

This invention discloses a composite ceramic used in dielectric adjustable microwave devices. The composite ceramic is composed of: BaZrxTi1-xO3 (x = 0.25-0.40) 40.0-95.0 wt. %, and Mg2TiO4 5.0-60 wt. %. The ceramic has continuously adjustable dielectric constant within 100-2000 with the change of composition as well as the Zr/Ti ratio. The dielectric loss is controlled around 0.001. The adjustability varies between 15-40% (25 kV/cm) due to different compositions.

Description

technical field [0001] The invention belongs to the technical field of electronic materials and devices, and in particular relates to a composite ceramic material which has adjustable dielectric properties and can be used for adjustable microwave devices. Background technique [0002] Microwave dielectric material is a new type of material with great application value and development potential. It has attracted more and more attention from the material circles at home and abroad. Among them, it is an important task to find new microwave dielectric ceramic materials with dielectric nonlinearity, that is, voltage-controlled adjustable. direction of development. Barium titanate-based ferroelectric materials have the nonlinear characteristic that the dielectric constant changes with the applied electric field. This adjustable characteristic can be applied in microwave circuits. The equivalent dielectric constant of the circuit can be changed by the applied electric field, thereb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/462C04B35/622H01L41/187
Inventor 翟继卫丑修建
Owner TONGJI UNIV
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