Low-temperature sintering available microwave dielectric ceramic Li4P2O7 and preparation method thereof

Abstract

The invention discloses an application of a phosphor-containing compound Li4P2O7 serving as a low-temperature sintering available microwave dielectric ceramic. The microwave dielectric ceramic is prepared by the following steps: (1) preparing original powders of 99.9% Li2CO3 and 99.9% NH4H2PO4 according to the chemical formula of Li4P2O7; (2) mixing the raw material in the step (1) and carrying out wet ball milling for 12 hours, baking, and then pre-sintering for 6 hours in the atmosphere at 820 DEG C, wherein the ball milling medium is ethanol; and (3) adding adhesive into the powder prepared in the step (2), granulating, pressing to mold, and finally sintering for 4 hours in the atmosphere at 880-900 DEG C, wherein the adhesive is a 5% polyvinyl alcohol solution, and accounts for 3 percent of the total mass of the powder. The ceramic prepared by the method can be excellently sintered at 880-900 DEGC, the dielectric constant is 13-14, the quality factor Qf value is up to 67,000-79,000GHz; the temperature coefficient of resonance frequency is small, and the microwave dielectric ceramic has a great application value in industry.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a dielectric substrate, a resonator, a filter and other microwave components used at microwave frequencies, as well as a dielectric ceramic material for 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. Components such as chips and dielectric waveguide circuits are the key basic materials of modern communication technology. They have been used in portable mobile phones, car phones, cordless phones, TV satellite receivers and military radars. They are used in modern communication tools. It is playing an increasingly important...

AI Technical Summary

Problems solved by technology

[0010] In the process of exploring and developing new low-firing microwave dielectric ceramic materials, material systems such as Li-based compounds, Bi-based compounds, tungstate compounds, and tellurate-based compounds with inherently low sintering temperatures have received extensive attention and research. A large number of exploratory studies have focused on Li-based binary or ternary compounds, and developed such as Li 2 TiO 3 , Li 2 MoO 4 and Li 2 MTi 3 o 8 (M=Mg or Zn) series of microwave dielectric ceramics with good performance, etc., but the ultra-low dielectric constant microwave dielectric ceramic system that can be fired at low temperature is still relatively limited, and there are fewer materials with good temperature stability, which is largely limited Low temperature co-firing technology and the development of microwave multilayer devices