极化率
材料科学
拉曼光谱
离子半径
电介质
陶瓷
分析化学(期刊)
八面体
热膨胀
介电常数
化学键
核磁共振
矿物学
离子
结晶学
分子
晶体结构
光学
化学
复合材料
物理
光电子学
有机化学
色谱法
作者
Weishuang Fang,Yang Yang,Huaicheng Xiang,Ying Tang,jie Li,Liang Fang
标识
DOI:10.1016/j.ceramint.2023.07.166
摘要
The microwave dielectric properties of olivine-structured CaLnGaO4 (Ln = Pr, Yb) ceramics with a 1:1 order at the octahedra site were investigated using bond valance, P–V-L chemical bond theory, and Raman spectra. The theoretical permittivity εr(C-M) values are far below the porosity-corrected εr(Corr) values, indicating that the dielectric polarizabilities of CaLnGaO4 (Ln = Pr, Yb) were underestimated, and this phenomenon was mainly influenced by rattling cations. The difference in εr is mainly determined by the ionic polarizability per unit volume (αm/Vm). The τf values of CaLnGaO4 (Ln = Pr, Yb) did not decrease with the decrease of the εr, which was due to the larger positive temperature coefficient of dielectric constant (τε) and the higher coefficient of thermal expansion (αL) of CaPrGaO4 ceramic compared to CaYbGaO4, respectively. The difference in Q × f values between CaPrGaO4 and CaYbGaO4 is mainly due to the strain of chemical bonds and the Raman spectrum.
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