High-permittivity microwave dielectric ceramic material and preparation method thereof

Abstract

The invention provides a high-permittivity microwave dielectric ceramic material. The material has the material chemical formula (Ca0.35Li0.25Nd0.35)(Ti1-xDx)O3, wherein x is larger than or equal to 0.01 and smaller than or equal to 0.05, the composition of D is VW, V represents Ta with the valence state higher than 4, W represents one or more elements with the valence state lower than four and the average ion radius close to Ti4+, and V and W can be substituted at the same time or independently. The invention further provides a preparation method of the high-permittivity microwave dielectric ceramic material. The method includes the steps of material mixing, ball grinding, drying, screening, pre-sintering, granulating, compression molding forming and sintering. The prepared material has a high dielectric constant, a high Q*f value and an adjustable frequency and temperature coefficient. Volatile toxic metal such as Pb and Cd is not contained in the formula, performance is stable, application requirements of modern microwave devices can be met, the raw materials can be sufficiently supplied in China, the price is relatively low, and low cost of high-performance microwave ceramic is made possible.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials and devices, and specifically relates to a high-dielectric Ca-Li-Nd-Ti-based microwave dielectric ceramic material with adjustable frequency temperature coefficient and a preparation method thereof, which can be used for making modern mobile communication and Microwave components such as dielectric resonators, dielectric filters, dielectric substrates, and dielectric antennas in Internet of Things technology. Background technique [0002] At present, information technology is developing rapidly in the direction of high frequency, high power, integration, and multi-function, and with the rapid development of modern mobile communication technology and Internet of Things technology, high-frequency microwave There are extensive and important applications in systems such as sensing Internet of Things radio frequency technology. Among them, radio frequency identifica...

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Problems solved by technology

However, Ca 0.35 Li 0.25 Nd 0.35 TiO 3 The quality factor is small and the frequency temperature coefficient is large, which cannot meet the actual needs

More importantly, the above CaO-Li 2 O-Ln 2 o 3 -TiO 2 Both systems need to press samples under isostatic pressing conditions, which also limits their large-scale application in the modern electronics industry

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