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Composite ceramic material in use for microwave device with adjustable dielectric

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

Inactive Publication Date: 2009-06-24
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
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Embodiment 1～4

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

[0030] Follow BaZr 0.35 Ti 0.65 O 3 Stoichiometric ratio of, weigh an appropriate amount of BaCO 3 , ZrO 2 And TiO 2 The powder is placed in a nylon ball milling tank, added with zirconia balls and absolute ethanol or deionized water, ball milled for 24 hours, discharged and dried and pre-fired at 1200°C for 4 hours. After grinding, BaZr is obtained. 0.35 Ti 0.65 O 3 The powder is ready for use.

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

[0032] Table 1. BaZr 0.35 Ti 0.65 O 3 -Mg 2 TiO 4 Composite ceramic material ratio

[0033] formula 1 # 2 # 3 # 4 # BaZr 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

[0034] Put the mixtures of the above formulas into nylon ball milling tanks, add 21g of zirconia balls and 40g of absolute ethanol, and ball mill for 24 ...

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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 with dielectric tunable characteristics and which can be used for tunable 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 important to find a new type of microwave dielectric ceramic material with dielectric nonlinearity, that is, voltage control and adjustable. Development direction. The barium titanate-based ferroelectric material has the nonlinear characteristic that the dielectric constant changes with the applied electric field. This adjustable characteristic can be used in microwave circuits. The equivalent dielectric constant of the circuit can be changed by the applied electric field, thereby contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/622H01L41/187H10N30/853
Inventor 翟继卫丑修建
Owner TONGJI UNIV
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