(Li0.5Nb0.5)3+共取代对MgAl2O4介电性能的影响
Effects of(Li0.5Nb0.5)3+co-substitution on microwave dielectric characteristics of MgAl2O4 ceramics
殷俊 1杨习志 1赖元明 1张芹 2戚聪 1李潇 1苏桦 2巫崇胜 1蒋刚1
作者信息
- 1. School of Mechanical and Electrical Engineering,Chengdu University of Technology,Chengdu 610059,China
- 2. State Key Laboratory of Electronic Thin Films and Integrated Devices,University of Electronic Science and Technology of China,Chengdu 610054,China
- 折叠
摘要
采用固相反应法制备了MgAl2-x(Li0.5Nb0.5)xO4介电陶瓷,分析了样品的晶体结构特征、物相组成以及介电性能.XRD精修结果显示,MgAl2O4和Mg5Nb4O15形成了一个稳定的两相系统.在1550℃烧结时,致密度随着(Li0.5Nb0.5)3+的含量增大而减小.品质因数Qf的变化趋势与致密度、填充分数以及共价度密切相关.另外,谐振频率温度系数τf主要受Al位键价影响.MgAl2-x(Li0.5Nb0.5)xO4陶瓷在1550℃烧结4 h后拥有最优介电性能:εr=8.21,Qf=81600 GHz和τf=-94×10-6℃-1.
Abstract
Nominal compositions MgAl2-x(Li0.5Nb0.5)xO4(x=0-0.20)microwave dielectric ceramics were synthesized via the traditional solid-state reaction.The crystal structural characteristics,crystalline phases,and microwave dielectric properties were investigated.Rietveld refinement results showed that MgAl2O4 and Mg5Nb4O15 form a stable two-phase system.Densification of the specimens decreases monotonically with the increase of(Li0.5Nb0.5)3+content when sintered at 1550℃.The variation tendency of quality factor(Qf)is closely related to the densification,packing fraction and covalency.Likewise,the bond valence of the Al-site is responsible for the temperature coefficient of resonance frequency(τf).MgAl2-x(Li0.5Nb0.5)xO4 ceramic with x=0.04 can be well densified by sintering at 1550℃for 4 h and exhibits optimum microwave dielectric properties with εr=8.21,Qf=81600 GHz,and τf=-94×10-6℃-1.
关键词
微波介电陶瓷/共取代/MgAl2O4陶瓷Key words
microwave dielectric ceramics/co-substitution/MgAl2O4 ceramic引用本文复制引用
基金项目
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,China(SKL-SPM-202021)
Projectsupported by Sichuan Science and Technology Program,China(2023YFQ0082)
Projectsupported by Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices,China(EFMD2022005Z)
出版年
2023
NETL
NSTL
万方数据