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Strontium cerate microwave dielectric ceramic material with high quality factor and preparation method thereof

A technology of microwave dielectric ceramics and high quality factor, which is applied in the field of material science to achieve the effect of simple preparation process, good repeatability and maintaining the stability of ceramic crystal structure

Active Publication Date: 2020-09-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of existing material systems and technologies, and provide a high-quality factor microwave dielectric ceramic material with low sintering temperature and stable crystal phase structure and its preparation method

Method used

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  • Strontium cerate microwave dielectric ceramic material with high quality factor and preparation method thereof
  • Strontium cerate microwave dielectric ceramic material with high quality factor and preparation method thereof

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Embodiment

[0021] 1. Molar ratio of SrCO 3 :CeO 2 =2:1 Weigh the raw material SrCO 3 and CeO 2 , under the condition of ethanol infiltration, carry out ball mill mixing for 4h; after drying, pre-calcine at 1150°C for 4h to obtain Sr 2 CeO 4 spare.

[0022] 2. According to the total mass ratio as Sr 2 CeO 4 : Li 2 CO 3 -Bi 2 o 3 =100-a:a prepares raw materials, wherein according to different Li 2 CO 3 -Bi 2 o 3 Composition The chemical formula of the total composition can be written as:

[0023] P0.5-1 99.5wt%Sr 2 CeO 4 -0.4wt% Bi 2 o 3 -0.1wt%Li 2 CO 3 ;(a=0.5,x:y=4)

[0024] P0.5-2 99.5wt%Sr 2 CeO 4 -0.3wt% Bi 2 o 3 -0.2wt%Li 2 CO 3 ;(a=0.5,x:y=1.5)

[0025] P0.5-3 99.5wt%Sr 2 CeO 4 -0.2wt% Bi 2 o 3 -0.3wt%Li 2 CO 3 ;(a=0.5,x:y=0.67)

[0026] P0.5-4 99.5wt% Sr 2 CeO 4 -0.1wt% Bi 2 o 3 -0.4wt%Li 2 CO 3 ;(a=0.5,x:y=0.25)

[0027] P1-1 99wt%Sr 2 CeO 4 -0.8wt% Bi 2 o 3 -0.2wt%Li 2 CO 3 ;(a=1,x:y=4)

[0028] P1-2 99wt%Sr 2 CeO 4 -0.6wt% Bi ...

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Abstract

The invention relates to the field of material science, and aims to provide a strontium cerate microwave dielectric ceramic material with a high quality factor and a preparation method thereof. The preparation method comprises the following steps of: doping a composite additive Li2CO3-Bi2O3 into a ceramic base material Sr2CeO4 so as to reduce the sintering temperature to 875-1100DEG C; the chemical expression of the dielectric ceramic material is as follows: (100-a)wt% Sr2CeO4+a wt% Li2CO3-Bi2O3, wherein a is greater than 0 and less than or equal to 4, and the mass ratio of Li2CO3 to Bi2O3 isequal to x:y=0.25-4. By reducing the sintering temperature of the Sr2CeO4 ceramic, abnormal growth of ceramic grains is avoided, and the ceramic crystal structure stability and excellent microwave dielectric properties are maintained. The preparation method is simple in preparation process, low in cost and good in repeatability, is suitable for large-scale production, and the strontium cerate microwave dielectric ceramic material has a wide application prospect in the field of microwave components like filters, antennas and dielectric substrates.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a microwave dielectric ceramic material with high quality factor and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of 5G mobile communication, satellite communication, wireless network, Bluetooth and other technologies, microwave devices are developing in the direction of miniaturization, high frequency and light weight, and higher requirements are put forward for microwave dielectric ceramic materials: The dielectric constant is serialized to meet the needs of different communication frequency bands; the higher the quality factor Q×f value, the better to reduce device loss; the lower the sintering temperature, the better, which is convenient for microstructure control and energy saving; the temperature coefficient of frequency is controllable and adjustable . Strontium cerate Sr 2 CeO 4 With extremely high q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C04B35/64
CPCC04B35/50C04B35/622C04B35/64C04B2235/3203C04B2235/3213C04B2235/3229C04B2235/3298
Inventor 张启龙周富明王浩杨辉
Owner ZHEJIANG UNIV