Composite microwave dielectric ceramic material with medium dielectric constant and method for preparing composite microwave dielectric ceramic material

Abstract

The invention relates to the field of material science, and aims to provide a composite microwave dielectric ceramic material with a medium dielectric constant. A chemical expression of the compositemicrowave dielectric ceramic material is (1-x)Li<2>Ti<0.75>(Mg<1 / 3>Nb<2 / 3>)<0.25>O<3+x>BaTi<4>O<9+ywt%>M. The x is larger than or equal to 0.4 and is smaller than or equal to 0.6, the y represents themass fraction of the total mass of Li<2>Ti<0.75>(Mg<1 / 3>Nb<2 / 3>)<0.25>O<3> and BaTi<4>O<9>, is larger than or equal to 0.5 and is smaller than or equal to 2, and the M represents auxiliaries and is one of LiF, MnCO<3>, CuO and GeO2 or a mixture of a plurality of the LiF, the MnCO<3>, the CuO and the GeO2. The composite microwave dielectric ceramic material has the advantages that the dielectric constant of the composite microwave dielectric ceramic material is approximately 30, and the composite microwave dielectric ceramic material has a high QXf (quality factor) value and a small temperature coefficient of resonance frequency; the requirements of microwave components such as resonators, filters and GPS (global positioning system) antennas on microwave dielectric ceramic materials with dielectric constants of approximately 30 can be met; processes for preparing the composite microwave dielectric ceramic material are simple and are good in repeatability.

Description

technical field [0001] The invention belongs to the field of material science, and in particular relates to a medium dielectric constant composite microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics are a type of ceramics that are used in the microwave frequency band (300MHz ~ 300GHz), and play a series of circuit functions such as dielectric isolation, dielectric waveguide and dielectric resonance in the circuit system. Microwave devices such as resonators, filters, and dielectric antennas made of microwave dielectric ceramic materials have become the core components of communication equipment. In recent years, with the rapid development of 4G / 5G mobile communication, satellite communication, wireless network, global satellite positioning system, Bluetooth and other technologies, microwave devices are developing in the direction of miniaturization, high frequency and light weight. Microwave diel...

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Problems solved by technology

Ba(Zn,Ta)O 3 Ceramics have excellent microwave dielectric properties: their dielectric constant is about 29, the quality factor Q×f is about 70000GHz, and the frequency temperature coefficient is close to zero, but Ta is expensive, and the manufacturing cost of this material is high

"Crystal structure and microwave dielectric properties of the low dielectric loss ZnZr" published by Li L X et al. in "Ceramics International", Volume 42, Volume 7, Page 9157-9161, 2016 1-x sn x Nb 2 o 8 ceramics” reported that ZnZr 0.8 sn 0.2 Nb 2 o 8 Microwave dielectric properties of ceramics sintered at 1275°C: their dielectric constant ε r It is 27.37, and the quality factor Q×f value is 76814GHz, but the frequency temperature coefficient of this ceramic is very large, reaching -55.09ppm / ℃