Ultra-low temperature sintered microwave dielectric ceramic li2pvo6 and its preparation method

Abstract

The invention discloses application of microwave dielectric ceramic formed by sintering a compound Li2PVO6 at an ultralow temperature. The preparation method of the microwave dielectric ceramic Li2PVO6 comprises the following steps: 1) preparing the original powder of Li2CO3, V2O5 and NH4H2PO4 of which the purities are above 99.9% according to the chemical formula of Li2PVO6; 2) mixing the materials of the step (1) for 12 hours with a medium of ethyl alcohol in a wet-type ball milling manner; then pre-sintering the mixture in an atmosphere of 600 DEG C after drying; 3) adding an agglomerant into the powder obtained in the step (2), carrying out granulating, compressing and molding, and sintering the powder in the atmosphere of 650 to 680 DEG C for 4 hours, wherein the agglomerant adopts a polyvinyl alcohol solution with a mass concentration of 5%, and dosage accounts for 3% of the total mass of the powder. The ceramic prepared by the invention is well sintered at 650 to 680 DEG C, smaller in the temperature coefficient and good in temperature stability; the dielectric constant reaches 10 to 11; the quality factor Qf is up to 71,000-90,000 GHz. Therefore, the microwave dielectric ceramic has a greatly high application value in industry.

Description

technical field [0001] The invention relates to dielectric ceramic materials, in particular to microwave components such as dielectric substrates, resonators and filters used at microwave frequencies, as well as dielectric ceramic materials for ceramic capacitors or temperature compensation capacitors and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used in microwave frequency (mainly UHF and SHF frequency bands) circuits as dielectric materials and complete one or more functions. They are widely used in modern communications as resonators, filters, dielectric bases Components such as chips and dielectric guided wave loops are the key basic materials of modern communication technology. They have been widely used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are widely used in modern communication tools. It is playing an increasingly important rol...

AI Technical Summary

Problems solved by technology

The main problem is that the resonant frequency temperature coefficient of most of the low-temperature sinterable single-phase microwave dielectric ceramic materials that have been publicly reported is too large, which cannot ensure that the device has good thermal stability, which largely limits Low temperature co-firing technology and the development of microwave multilayer devices

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