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Influence of Co substitution on crystal structures, Raman spectroscopy, and microwave dielectric properties of Mg 2 SnO 4 ceramics
Journal of the Australian Ceramic Society ( IF 1.9 ) Pub Date : 2020-06-30 , DOI: 10.1007/s41779-020-00494-w
Yih-Chien Chen , Yu-Xuan Du

The microwave dielectric properties of (Mg1-xCox)2SnO4 were investigated by X-ray diffraction (XRD) patterns, Rietveld refinement, Raman spectroscopy, and microstructural observation. As x increased from 0 to 0.05, both the lattice constant and the unit cell volume increased, indicating that the Co2+ ions effectively dissolved among the Mg2+ ions. However, when x exceeded 0.05, the Co2+ ions were not effectively dissolved. The bond length in the oxygen octahedron increased with x. In the Raman spectroscopy, the Raman peak in the A1g vibration mode shifted to a lower frequency as x increased. The (Mg0.95Co0.05)2SnO4 ceramic had the lowest FWHM of the peak in the A1g Raman mode. (Mg0.95Co0.05)2SnO4 ceramic that was sintered at 1550 °C for 4 h had a dielectric constant (εr) of 8.3, a quality factor (Q × f) of 120,200 GHz (at 17.6 GHz), and a temperature coefficient of resonant frequency (τf) of − 63 ppm/°C.



中文翻译:

Co取代对Mg 2 SnO 4陶瓷晶体结构,拉曼光谱和微波介电性能的影响

通过X射线衍射(XRD)图谱,Rietveld精细化,拉曼光谱和显微组织观察研究了(Mg 1-x Co x2 SnO 4的微波介电性能。当x从0增加到0.05时,晶格常数和晶胞体积均增加,表明Co 2+离子有效地溶解在Mg 2+离子之中。然而,当x超过0.05时,Co 2+离子不能有效地溶解。氧八面体中的键长随x增加。在拉曼光谱中,A 1g中的拉曼峰x增大时,振动模式移至较低频率。(Mg 0.95 Co 0.052 SnO 4陶瓷在A 1g拉曼模式下具有最低的峰FWHM 。(镁0.950.052的SnO 4这是在1550烧结陶瓷℃下4小时有介电常数(ε - [R的8.3),质量因子(Q  ×  ˚F 120200千兆赫)(在17.6千兆赫),以及一个谐振频率(的温度系数τ ˚F 63ppm的/℃ -的)。

更新日期:2020-06-30
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