Abstract
Herein, the influence of Cu2+ substitution on the phase composition, bulk density, microstructures, and microwave dielectric properties of Li2CuxZn1−xSiO4 (0 ≤ x ≤ 0.06) ceramics prepared by a solid-state reaction were investigated. The results of XRD and mapping showed that Cu2+ substitution can avoid the influence of secondary phase on the properties of samples. According to the analysis of bulk density, microstructure and microwave dielectric properties, a proper amount of Cu substitution not only improved the sintering characteristics of Li2CuxZn1−xSiO4 ceramics, reduced the densification temperature from 1250 °C to 950 °C, but also increased the Q×f value. Furthermore, Cu2+ substitution also improved the temperature stability of the samples. Particularly, the Li2Cu0.04Zn0.96SiO4 ceramics sintered at 950 °C for 5 h possessed excellent microwave dielectric properties: εr = 5.624, Q×f = 12,764 GHz, and τf = −77 ppm/°C, exhibiting a potential for the low temperature co-fired ceramic applications.
Highlights
In recent years, the continuous innovation and development of communication technology has brought great convenience to all aspects of human production and social activities
Microwave dielectric ceramic is a kind of dielectric ceramic material which is used in microwave band circuit and realizes specific functions
Low dielectric constant corresponds to short delay time, it is conducive to signal propagation. (B) quality factor (Q×f), which represents the dielectric loss of the material and is related to the reliability and life of the material. (C) the temperature coefficient of the resonant frequency, the closer τf value is to zero, the better the temperature stability of the resonant frequency of the sample
Summary
The continuous innovation and development of communication technology has brought great convenience to all aspects of human production and social activities. Microwave dielectric ceramic is a kind of dielectric ceramic material which is used in microwave band circuit and realizes specific functions. It has become the key basic material of modern communication technology and the cornerstone of communication technology innovation. Microwave dielectric ceramics have three important parameters: (A) dielectric constant (εr), which is related to the delay of microwave propagation in materials (Td = L√εr/c, where L is the traveling distance of the signal and c is the speed of light) [1]. The sintering temperature of LTCC materials should be lower than the melting point of Ag (961°C) [2, 3]
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