摘要
采用固相反应法制备Li2Zn2(Mo(1–x)Wx)3O12陶瓷,研究了其相组成、显微组织及微波介电性能的变化规律。结果表明:当W6+取代量在0~0.1范围内,Li2Zn2(Mo(1–x)Wx)3O12陶瓷均显示出单相钒铁铜矿结构,形成了Li2Zn2(Mo(1–x)Wx)3O12固溶体。随着W6+代量增加,Li2Zn2(Mo(1–x)Wx)3O12陶瓷的相对密度、介电常数和Q×f值均先增大后减小,其τf值则逐渐增大。当W6+取代量为0.025时,Li2Zn2(Mo0.975W0.025)3O12陶瓷经630℃烧结2 h后具有较好的微波介电性能:εr=10.75,Q×f=630 95 GHz,τf=–65×10-6/℃。
Li2Zn2(Mo1–xWx)3O12 ceramics were prepared by a conventional solid-state ceramic route.The phase composition,microstructure and microwave dielectric properties of Li2Zn2(Mo1–xWx)3O12 ceramics were investigated.The results show that a pure lyonsite crystal structured solid solution,Li2Zn2(Mo1–xWx)3O12,is formed when the substitution amount of W6+ions is in the range of 0 to 0.1.The relative densities,dielectric constants,and Q×f values of Li2Zn2(Mo1–xWx)3O12 ceramics initially increase and then decrease,while the temperature coefficient of resonance frequency increases gradually with the increase of W6+ions substitution amount.The Li2Zn2(Mo0.975W0.025)3O12 ceramic sintered at 630℃for 2 h exhibits good microwave dielectric properties(i.e.,εr=10.75,Q×f=63 095 GHz,andτf=–65×10-6/℃)when the W6+ions substitution amount is 0.025.
作者
王丽珠
吕学鹏
徐静
董作为
郑勇
WANG Lizhu;LV Xuepeng;XU Jing;DONG Zuowei;ZHENG Yong(College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;School of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing 211167,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2019年第9期1276-1282,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金资助项目(No.51674148和No.51602145)
江苏高校优势学科建设工程资助项目
中央高校基本科研业务费专项资金资助(No.NS2016060)
三峡大学无机非金属晶态与能源转换材料重点实验室开放基金(2017KIE06)
关键词
钼酸锂锌
离子取代
显微组织
微波介电性能
lithium zinc molybdate
ion substitution
microstructure
microwave dielectric properties
