Microwave dielectric ceramic NaCa2(Mg1-xZnx)2V3O12 capable of sintering at low temperature and preparation method

Abstract

The invention discloses a microwave dielectric ceramic NaCa2(Mg1-xZnx)2V3O12 capable of sintering at a low temperature and the preparation method of the microwave dielectric ceramic. The general formula of the chemical constitution of the dielectric ceramic is Li2Ba1-xSrxTi6O14, wherein x is greater than or equal to 0 and less than or equal to 1; the microwave dielectric ceramic is obtained by the following steps: preparing the original powders of Na2CO3, CaCO3, MgO, ZnO and V2O5 with purities of more than 99.9% to form ingredients according to the NaCa2(Mg1-xZnx)2V3O12, wherein x is greater than or equal to 0 and less than or equal to 1; mixing the ingredients for 12 hours by wet milling processing, wherein the solvent is distilled water; after drying the mixture, presintering the mixture for 6 hours in an air atmosphere of 750 DEG C, and then adding an adhesive agent into the presintered powder, after granulating, pressing and moulding the mixture, and finally sintering the mixture for 4 hours in an air atmosphere of 860 -935 DEG C, wherein the adhesive agent uses a polyvinyl alcohol solution with mass concentration of 5%, and the dosage is 3% of the total amount of the powder. The microwave dielectric ceramic prepared by the method provided by the invention has the advantages of low loss and excellent thermal stability; and meanwhile, the microwave dielectric ceramic has high frequency dielectric constant that reaches 10-26, and Qf value that is up to 60000 -100000 GHz, thus having great application value on industry.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric resonator, a filter and other microwave components used at microwave frequencies, as well as the dielectric ceramic material of a ceramic capacitor or a temperature compensation capacitor and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in circuits in the microwave frequency band (mainly UHF and SHF bands) and perform one or more functions. They are widely used as resonators, filters, and dielectric substrates in modern communications. Chips, dielectric waveguide circuits and other components are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers, military radars, etc. It is playing an increasingly important role in the process of miniaturization and integration....

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Problems solved by technology

However, the system for low-fired microwave dielectric ceramics is still relatively limited, which largely limits the development of low-temperature co-firing technology and microwave multilayer devices

, the literature [Kazuake I, Junpei U. Morphology of flux-grown vanadate garnets. [J]. J. Crystal Growth., 2006, 291:436-441] reported the garnet structure compound NaCa2 Mg2V3O12, NaCa2Zn2V The crystal structure of 3O12, but not related to the microwave dielectric properties

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