当前位置: X-MOL 学术Vib. Spectrosc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Optical-Vibration Properties of Li2ZnGeO4 Dielectric Ceramics
Vibrational Spectroscopy ( IF 2.5 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.vibspec.2020.103130
Jéssica I. Viegas , Roberto L. Moreira , Anderson Dias

Abstract This work reports on the optical-vibration properties of Li2ZnGeO4 ceramics prepared by solid-state reactions. Single-phase, high-purity materials belonging to the monoclinic P21/n space group were obtained. Micro-Raman scattering and micro-infrared spectroscopy, besides group-theory calculations, were employed to determine and assign the phonon modes. Polarized Raman scattering was able to discern and assign a total of 36 modes, in good agreement with theoretical predictions (48 phonons were foreseen). Micro-infrared spectroscopy in the frequency range 50−4000 cm−1 was applied on sintered, polished samples and a total of 30 polar modes were identified (among the 45 infrared modes predicted by group-theory calculations). Detailed dispersion analyses were conducted by using Kramers-Kronig relations as well as the Lorentz model. Intrinsic dielectric constant and quality factor were calculated as 6.2 and 387 THz, respectively. The promising results obtained in the present work showed that monoclinic Li2ZnGeO4 ceramics are suitable for applications in wireless communication devices.

中文翻译:

Li2ZnGeO4 介电陶瓷的光振动特性

摘要 这项工作报告了固态反应制备的 Li2ZnGeO4 陶瓷的光振动性能。获得了属于单斜 P21/n 空间群的单相高纯度材料。除了群论计算外,还采用微拉曼散射和微红外光谱来确定和分配声子模式。偏振拉曼散射能够识别和分配总共 36 种模式,与理论预测非常吻合(预见了 48 种声子)。将频率范围为 50-4000 cm-1 的微红外光谱应用于烧结、抛光的样品,并确定了总共 30 种极性模式(在群论计算预测的 45 种红外模式中)。通过使用 Kramers-Kronig 关系以及 Lorentz 模型进行详细的色散分析。固有介电常数和品质因数分别计算为 6.2 和 387 THz。在目前的工作中获得的有希望的结果表明,单斜晶 Li2ZnGeO4 陶瓷适用于无线通信设备。
更新日期:2020-09-01
down
wechat
bug