Microwave Sintering and Microwave Dielectric Properties of (1-x)Ca0.61La0.26TiO3-xNd(Mg0.5Ti0.5)O3 Ceramics.

Shuwei Yang,Caisheng Fang,Yunlong Ai,Bingliang Liang,Jin Liu,Changhong Liu

doi:10.3390/ma14020438

Abstract

The (1–x)Ca0.61La0.26TiO3-xNd(Mg0.5Ti0.5)O3 [(1–x)CLT-xNMT, x = 0.35~0.60] ceramics were prepared via microwave sintering. The effects of sintering temperature and composition on the phase formation, microstructure, and microwave dielectric properties were investigated. The results show that the microwave sintering process requires a lower sintering temperature and shorter sintering time of (1–x)CLT-xNMT ceramics than conventional heating methods. All of the (1–x)CLT-xNMT ceramics possess a single perovskite structure. With the increase of x, the dielectric constant (ε) shows a downward trend; the quality factor (Qf) drops first and then rises significantly; the resonance frequency temperature coefficient (τf) keeps decreasing. With excellent microwave dielectric properties (ε = 51.3, Qf = 13,852 GHz, τf = −1.9 × 10−6/°C), the 0.65CLT-0.35NMT ceramic can be applied to the field of mobile communications.

Highlights

IntroductionWith the advent of the 5G era, microwave dielectric ceramics attract more and more attention [1]
Sintering and Microwave DielectricWith the advent of the 5G era, microwave dielectric ceramics attract more and more attention [1]
The (1−x)Ca0.61 La0.26 TiO3− xNd(Mg0.5 Ti0.5 )O3 [(1−x)CLTxNMT, x = 0.35~0.60] ceramics were prepared by microwave sintering and an in-depth study was conducted of the effects of sintering process and component ratio on its phase composition, microstructure, and microwave dielectric properties

Summary

Introduction

With the advent of the 5G era, microwave dielectric ceramics attract more and more attention [1]. The dielectric materials with high dielectric constant, high Qf value, near-zero temperature coefficient of resonance frequency, and low sintering temperature are strong candidates for 5G technology [4]. The Ca0.61 La0.26 TiO3 (CLT) ceramic, with typical perovskite structure, is characterized by a high dielectric constant (ε = 120) and a high quality factor (Qf = 10,700 GHz), but a very high positive resonant frequency temperature coefficient (τ f = 304 × 10−6 /◦ C) [5]. The Nd(Mg0.5 Ti0.5 )O3 (NMT) ceramic has a perovskite structure with Qf value of

Methods

Results

Conclusion