Crystal structure and microwave dielectric properties of Li2Mg0.6-xCoxZn0.4SiO4 ceramic for LTCC applications
Crystal structure and microwave dielectric properties of Li2Mg0.6-xCoxZn0.4SiO4 ceramic for LTCC applications
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用于 LTCC 应用的 Li2Mg0.6-xCoxZn0.4SiO4 陶瓷的晶体结构和微波介电性能
DOI：
10.1016/j.ceramint.2020.02.081
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发表时间：
2020
影响因子：
5.2
通讯作者：
Jing Yulan
中科院分区：
文献类型：
--
作者：
Zhong Maofeng;Su Hua;Jing Xiaolin;Li Yuanxun;Lu Qihai;Jing Yulan
本文采用固相反应法合成了添加3 wt% Li 2 O-B2 O3-Bi 2 O3-SiO2（LBBS）玻璃的Li2Mg0.6− xCoxZn0.4SiO4（x = 0-0.4）陶瓷。研究了Co2+取代Mg 2+对Li 2 Mg 0. 6 − xCoxZn 0. 4SiO 4陶瓷的晶体结构、显微结构、致密化、晶化和微波介电性能的影响。X射线衍射分析表明，单斜相Li 2 MgSiO 4、单斜相Li 2 ZnSiO 4和正交相Li 2CoSiO 4在Li2Mg0.6− xCoxZn0.4SiO4陶瓷中形成有限固溶体。通过扫描电子显微镜观察到清晰的晶界。Co2+对Mg 2+的取代增加了陶瓷的晶粒尺寸、致密化程度、结晶度和介电常数，并在一定程度上降低了陶瓷的介电损耗。τ f的绝对值与结晶度呈正相关。添加3wt%LBBS的Li2Mg0.55Co0.05Zn0.4SiO4陶瓷在900 °C下烧结，其微波介电性能为εr= 5.8，Q ×f= 47，518 GHz，τf= −74.8 ppm/°C。因此，该陶瓷被认为是用于基板和过滤器应用的候选低温共烧陶瓷材料。
In this work, Li2Mg0.6−xCoxZn0.4SiO4ceramics (x = 0–0.4) added with 3 wt% Li2O–B2O3–Bi2O3–SiO2(LBBS) glass were synthesised using the solid-state reaction method. The effects of substituting Co2+for Mg2+in Li2Mg0.6−xCoxZn0.4SiO4ceramics on crystal structure, microstructure, densification, crystallisation and microwave dielectric properties were investigated. X-ray diffraction patterns showed that monoclinic Li2MgSiO4, monoclinic Li2ZnSiO4and orthorhombic Li2CoSiO4formed finite solid solution in Li2Mg0.6−xCoxZn0.4SiO4ceramics. Clear grain boundaries were observed via scanning electron microscopy. The substitution of Co2+for Mg2+increased grain size, densification, crystallinity degree and dielectric constant; it also reduced the dielectric loss of the ceramics to a certain extent. The absolute values ofτfwere positively related to the crystallinity degree. Li2Mg0.55Co0.05Zn0.4SiO4ceramic added with 3 wt% LBBS and sintered at 900 °C exhibited considerable microwave dielectric properties ofεr= 5.8,Q×f= 47,518 GHz andτf= −74.8 ppm/°C. Therefore, the ceramic is considered a candidate low-temperature co-fired ceramic material for substrate and filter applications.