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Improved microwave dielectric properties of MgAl_(2)O_(4)spinel ceramics through(Li_(1/3)Ti_(2/3))^(3+)doping 被引量:1
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作者 李潇 杨习志 +7 位作者 赖元明 张芹 李宝阳 戚聪 殷俊 王凡硕 巫崇胜 苏桦 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第5期668-673,共6页
A series of nominal compositions MgAl_(2-x)(Li_(1/3)Ti_(2/3))_(x)O_(4)(x=0,0.04,0.08,0.12,0.16,and 0.20)ceramics were successfully prepared via the conventional solid-state reaction route.The phase compositions,micros... A series of nominal compositions MgAl_(2-x)(Li_(1/3)Ti_(2/3))_(x)O_(4)(x=0,0.04,0.08,0.12,0.16,and 0.20)ceramics were successfully prepared via the conventional solid-state reaction route.The phase compositions,microstructures,and microwave dielectric properties were investigated.The results of x-ray diffraction(XRD)and scanning electron microscopy(SEM)showed that a single phase of MgAl_(2-x)(Li_(1/3)Ti_(2/3))_(x)O_(4)ceramics with a spinel structure was obtained at x≤0.12,whereas the second phase of MgTi_(2)O_(5)appeared when x>0.12.The cell parameters were obtained by XRD refinement.As the x values increased,the unit cell volume kept expanding.This phenomenon could be attributed to the partial substitution of(Li_(1/3)Ti_(2/3))^(3+)for Al^(3+).Results showed that(Li_(1/3)Ti_(2/3))^(3+)doping into MgAl_(2)O_(4)spinel ceramics effectively reduced the sintering temperature and improved the quality factor(Q_f)values.Good microwave dielectric properties were achieved for a sample at x=0.20 sintering at 1500℃in air for 4 h:dielectric constantε_(r)=8.78,temperature coefficient of resonant frequencyτ_(f)=-85 ppm/℃,and Q_(f)=62300 GHz.The Q_(f)value of the x=0.20 sample was about 2 times higher than that of pure MgAl_(2)O_(4)ceramics(31600 GHz).Thus,MgAl_(2-x)(Li_(1/3)Ti_(2/3))_(x)O_(4)ceramics with excellent microwave dielectric properties can be applied to 5G communications. 展开更多
关键词 microwave dielectric ceramics MgAl_(2)O_(4)ceramic co-substitution MgTi_(2)O_(5) solid solubility limit
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(Li_(0.5)Nb_(0.5))^(3+)共取代对MgAl_(2)O_(4)介电性能的影响
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作者 殷俊 杨习志 +6 位作者 赖元明 张芹 戚聪 李潇 苏桦 巫崇胜 蒋刚 《Journal of Central South University》 SCIE EI CAS CSCD 2023年第5期1461-1468,共8页
采用固相反应法制备了MgAl_(2-x)(Li_(0.5)Nb_(0.5))_(x)O_(4)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,MgAl_(2)O_(4)和Mg_(5)Nb_(4)O_(15)形成了一个稳定的两相系统。在1550℃烧结时,致密度随着(Li... 采用固相反应法制备了MgAl_(2-x)(Li_(0.5)Nb_(0.5))_(x)O_(4)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,MgAl_(2)O_(4)和Mg_(5)Nb_(4)O_(15)形成了一个稳定的两相系统。在1550℃烧结时,致密度随着(Li_(0.5)Nb_(0.5))^(3+)的含量增大而减小。品质因数Q_(f)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τ_(f)主要受Al位键价影响。MgAl_(2-x)(Li_(0.5)Nb_(0.5))_(x)O_(4)陶瓷在1550℃烧结4 h后拥有最优介电性能:ε_(r)=8.21,Q_(f)=81600 GHz和τ_(f)=-94×10^(-6)℃^(-1)。 展开更多
关键词 微波介电陶瓷 共取代 MgAl_(2)O_(4)陶瓷
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基于复合铁氧体基片的三倍频程超宽带微带环行器设计与仿真分析 被引量:3
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作者 高黎文 刘凯 +4 位作者 刘颖力 王雨 巫崇胜 刘谦 曾千骞 《磁性材料及器件》 CAS 2018年第3期25-29,34,共6页
通常利用单一铁氧体材料制成的微带环行器难以有超倍频程的带宽。根据一般微带环行器的设计理论,利用两种不同的铁氧体材料构成的复合基片设计并制作了一种工作在三倍频程带宽的超宽带微带环行器。仿真结果表明,该环行器在6~18 GHz的工... 通常利用单一铁氧体材料制成的微带环行器难以有超倍频程的带宽。根据一般微带环行器的设计理论,利用两种不同的铁氧体材料构成的复合基片设计并制作了一种工作在三倍频程带宽的超宽带微带环行器。仿真结果表明,该环行器在6~18 GHz的工作频带内,插入损耗(|S12|)小于1 d B,回波损耗(|S11|)大于20 d B,隔离度(|S21|)约19 d B,满足超宽带微带环行器的设计指标。除在整个工作频带内插入损耗有所增加且在低频段的6~6.5 GHz内出现了低场损耗外,实测结果与仿真结果基本吻合。文末讨论了实测结果和仿真结果之间出现低场损耗等差异的原因。 展开更多
关键词 微带环行器 超宽带 复合材料 设计 制作
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