摘要
采用固相反应法制备了Li_2(Zn_(1–x)Co_x)_2Mo_3O_(12)陶瓷,研究了Co^(2+)取代对其相结构和微波介电性能的影响,并通过添加Ti O_2调节了该陶瓷的τ_f值。结果表明:不同Co^(2+)取代的Li_2(Zn_(1–x)Co_x)_2Mo_3O_(12)陶瓷均显示出单相钒铁铜矿结构。随着Co^(2+)取代量的增加,陶瓷的致密化温度显著降低,相对密度和Q·f值均呈现先增大后减小的趋势。当x=0.1时,陶瓷具有相对较好的微波介电性能:ε_r=10.85,Q·f=65 031 GHz,τ_f=–73×10^(–6)/℃。添加Ti O_2能够有效调节Li_2Zn_2Mo_3O_(12)陶瓷的τ_f值向正值方向移动,0.4Li_2(Zn_(0.9)Co_(0.1))_2Mo_3O_(12)-0.6Ti O_2陶瓷的介电性能较佳:ε_r=15.80,Q·f=22 991 GHz,τ_f=–4.5×10^(–6)/℃。
Li2（Zn1–xCox）2Mo3O12 ceramics were prepared by the solid-state reaction method. The effects of the Co^2＋ substitution on the phase structures and microwave dielectric properties of Li2（Zn1–xCox）2Mo3O12 ceramics were investigated. In addition, it was also explored to adjust τf values of the ceramics by adding TiO2. It was found that Li2（Zn1–xCox）2Mo3O12 ceramics with different Co^2＋ substitution were pure lyonsite phases. The optimized sintering temperature of the ceramic decreased significantly, and the density and Q·f value of the ceramic increased firstly, and then decreased with increasing content of Co. The Li2（Zn0.9Co0.1）2Mo3O12 ceramic exhibits microwave dielectric properties of εr =10.85, Q·f=65 031 GHz, τf= –73×10^–6/℃. The addition of TiO2 could adjust the τf of Li2Zn2Mo3O12 ceramics to the positive direction effectively. The 0.4Li2（Zn0.9Co0.1）2Mo3O12-0.6TiO2 ceramic exhibits good microwave dielectric properties of εr =15.80,Q·f=22 991 GHz,τf= –4.5×10^–6/℃.
出处
《电子元件与材料》
CAS
CSCD
2017年第11期16-21,37,共7页
Electronic Components And Materials
基金
国家自然科学基金资助项目(No.51674148
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)
