ZnTiNb2O8-series microwave dielectric ceramic material and preparing method thereof

Abstract

The invention belongs to the field of electronic ceramics and preparing methods thereof, and particularly relates to a ZnTiNb2O8-series microwave dielectric ceramic material and a preparing method thereof. According to the material, the dielectric constant is 30 to 46, the loss is smaller than or equal to 1.5*10<-4>, the frequency temperature coefficient tau<f> is larger than or equal to -10 ppm / DEG C and smaller than or equal to +10 ppm / DEG C, the major crystalline phase is ZnTiNb2O8, and the second phase is Zn0.17Nb0.33Ti0.5O2. The raw materials ZnO, TiO2, Nb2O5, Co2O3 and Ta2O5 are matched according to the general chemical formula (Zn1-xCox)0.5Ti0.5(Nb1-yTay)O4 (x is larger than or equal to 0 mol and smaller than or equal to 0.95 mol, and y ranges from 0.05 mol to 0.95 mol), the solid phase method is conducted, and the material is prepared. According to the material and the preparing method, Co ions and Ta ions are substituted for Zn ions and Nb ions respectively, a limited solid solution is formed, the portion beyond the solid solution forms the second phase with the positive temperature coefficient, the frequency temperature coefficient is adjusted to be nearly zero, the good microwave performance is kept, the preparing method is simple in technology, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of electronic ceramics and its manufacture, in particular to a ZnTiNb 2 o 8 The invention relates to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used in microwave (300MHz to 300GHz) frequency band circuits as dielectric materials and to achieve one or more functions, and are the basis of modern communication technology. [0003] The integration of microwave circuits is an important means to realize miniaturization, high stability and low cost of microwave equipment. Due to the excessive volume and weight of metal resonators and metal waveguides, the development of microwave integrated circuits is limited, and microwave hybrid integrated circuits composed of resonators made of microwave dielectric ceramics, microwave tubes, and microstrip lines can make the device size reach millimeters. level, which ...

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Problems solved by technology

But in ZnTiNb 2 o 8 A material with a positive temperature coefficient such as TiO 2 , but cannot be sintered densely, resulting in a decrease in the microwave dielectric properties

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