拉曼光谱
材料科学
结构精修
陶瓷
金红石
半最大全宽
电介质
分析化学(期刊)
微波食品加热
衍射
矿物学
光学
物理
化学
复合材料
光电子学
有机化学
量子力学
色谱法
作者
Lei Xiao,Lianwen Deng,Yingxiang Li,Zhenjun Qing,Yecheng Xi,Jiahui Zhu,Sen Peng
标识
DOI:10.1016/j.jeurceramsoc.2023.08.031
摘要
TiSnNbTaGa2O12 (TSNTGO) high–entropy dielectric ceramic was successful synthesized using the solid-state reaction method. X–ray diffraction (XRD), Rietveld refinement and transmission electron microscopy (TEM) were used to verify that all samples have rutile structure of P42–mnm space group. The analysis of Raman spectra proved that the εr exhibited a contrary changing trend as that of Raman shift near 822 cm−1, and the same similar relationship occurred between Q×f values and full width at half maximum (FWHM). The exploration of complex chemical bonding theory (P–V–L theory) for TSNTGO ceramics suggested that the bond ionicity played a dominant role in εr, while Q×f and τf were primarily determined by lattice energy and bond energy, respectively. Notably, the TSNTGO ceramics sintered at 1275 ℃ demonstrated optimal microwave dielectric properties of εr = 33.62 ± 0.03, Q×f = 51,832 ± 1000 GHz (f0 = 6.4 GHz), and τf = –0.38 ± 0.16 ppm/℃.
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