无机材料学报2025，Vol.40Issue(6)：656-666,11.DOI:10.15541/jim20240529
Rattling效应:一种影响微波介质陶瓷谐振频率温度系数的新机制
Rattling Effect:A New Mechanism Affecting the Resonant Frequency Temperature Coefficient of Microwave Dielectric Ceramics
摘要
Abstract
Microwave dielectric ceramics are the key basic materials of 5G/6G communication technology,with particular emphasis on the materials that exhibit a high quality factor(Q×f),low dielectric constant(εr)and near-zero temperature coefficient of resonant frequency(τf).However,most low-εr materials tend to have a significantly negative τf value.This study provides a systematic overview of the classical ionic polarizability dilution mechanism and phase transition mechanism,along with the structural factors affecting τf,such as unit cell volume mechanism,oxygen polyhedron distortion,bond energy,bond ionicity,and bond valence.Subsequently,the anomalous changes in τf in the cubic normal and inverse garnet systems without phase transition are described in detail.The"Rattling"effect is introduced as a novel mechanism affecting the τf of microwave dielectric ceramics.Cations involved in"Rattling",characterized by high coordination and weak chemical bonds,are the primary factors affecting the overall microwave dielectric polarization and loss of the material.This phenomenon results in an increase in ionic polarizability and εr,a forward shift in τf and a reduction in Q×f value,which has been verified and applied in many different material systems.Furthermore,the introduction of a weighted function for total ion polarization deviation serves to evaluate the impact of the entire molecule's"Rattling"and"Compressed"effects on εr.A novel concept of temperature coefficient of ionic polarizability(ταm)is also proposed,allowing for quantitative calculation.This simplifies the factors that affect the positive and negative of dielectric constant temperature coefficient(τε),by relating it to εr,ταm and linear expansion coefficient αL.关键词
微波介质陶瓷/Rattling效应/谐振频率温度系数/离子极化率温度系数/影响机制/总离子极化偏差的加权函数Key words
microwave dielectric ceramic/Rattling effect/temperature coefficient of resonance frequency/temperature coefficient of ionic polarizability/influence mechanism/weighted function for total ion polarizability deviation分类
数理科学引用本文复制引用
唐莹,李洁,相怀成,方维双,林慧兴,杨俊峰,方亮..Rattling效应:一种影响微波介质陶瓷谐振频率温度系数的新机制[J].无机材料学报,2025,40(6):656-666,11.基金项目
广西科技计划项目(2024GXNSFFA010013,AD24010021) （2024GXNSFFA010013,AD24010021）
国家自然科学基金(52362017)Natural Science Funds of Guangxi Province(2024GXNSFFA010013,AD24010021) （52362017）
National Natural Science Foundation of China(52362017) （52362017）
