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Polarized Raman scattering and infrared dispersion analysis of Na2ZnGeO4 ceramics
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-06-29 , DOI: 10.1002/jrs.5927 Jéssica Ivone Viegas 1 , Roberto Luiz Moreira 2, 3 , Anderson Dias 1
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-06-29 , DOI: 10.1002/jrs.5927 Jéssica Ivone Viegas 1 , Roberto Luiz Moreira 2, 3 , Anderson Dias 1
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The structural, chemical, morphological, and optical‐vibration properties of Na2ZnGeO4 ceramic samples prepared by conventional solid‐state processing and sintered at 1,100°C are investigated in detail. X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and electron energy‐loss spectroscopy (EELS) showed that single‐phase samples belonging to the monoclinic Pn (= 
) space group were obtained. Optical‐vibration investigations by polarized Raman and infrared spectroscopies altogether allowed us to present the characteristic features of the relevant polar phonons of the material, for the first time. Twenty‐nine out of the 45 optical modes predicted for Na2ZnGeO4 by group theory were determined, and their symmetries are revealed. The dielectric strengths of the modes that contribute to the dielectric response were obtained. Besides, the infrared dispersion parameters allowed us to calculate the extrapolated dielectric constants ε0 = 7.62 and ε∞ = 2.80, and an intrinsic quality factor Qu × f = 154 THz, at 10 GHz. The obtained values show that this material can be classified as a low‐k high‐Q ceramics, which potential applications in microwave circuitry.
中文翻译：
Na2ZnGeO4陶瓷的偏振拉曼散射和红外色散分析
详细研究了通过常规固态工艺制备并在1100°C烧结的Na 2 ZnGeO 4陶瓷样品的结构，化学，形态和光学振动特性。X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），能量色散光谱（EDS）和电子能量损失光谱（EELS）表明，单相样品属于单斜晶系Pn（ =）获得了空间群。偏振拉曼光谱和红外光谱法对光学振动的研究使我们首次展示了材料相关极性声子的特征。Na预测的45种光学模式中有29种通过基团理论确定了2个ZnGeO 4，并揭示了它们的对称性。获得了有助于介电响应的模式的介电强度。此外，红外线分散参数使我们能够计算外推的介电常数ε 0 = 7.62和ε ∞ = 2.80，和本征品质因数Q Ù × ˚F = 154赫兹，在10GHz。所得值表明，该材料可以归类为低k高Q陶瓷，在微波电路中有潜在的应用。
更新日期：2020-06-29
) space group were obtained. Optical‐vibration investigations by polarized Raman and infrared spectroscopies altogether allowed us to present the characteristic features of the relevant polar phonons of the material, for the first time. Twenty‐nine out of the 45 optical modes predicted for Na2ZnGeO4 by group theory were determined, and their symmetries are revealed. The dielectric strengths of the modes that contribute to the dielectric response were obtained. Besides, the infrared dispersion parameters allowed us to calculate the extrapolated dielectric constants ε0 = 7.62 and ε∞ = 2.80, and an intrinsic quality factor Qu × f = 154 THz, at 10 GHz. The obtained values show that this material can be classified as a low‐k high‐Q ceramics, which potential applications in microwave circuitry.
中文翻译：
Na2ZnGeO4陶瓷的偏振拉曼散射和红外色散分析
详细研究了通过常规固态工艺制备并在1100°C烧结的Na 2 ZnGeO 4陶瓷样品的结构，化学，形态和光学振动特性。X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），能量色散光谱（EDS）和电子能量损失光谱（EELS）表明，单相样品属于单斜晶系Pn（ =
）获得了空间群。偏振拉曼光谱和红外光谱法对光学振动的研究使我们首次展示了材料相关极性声子的特征。Na预测的45种光学模式中有29种通过基团理论确定了2个ZnGeO 4，并揭示了它们的对称性。获得了有助于介电响应的模式的介电强度。此外，红外线分散参数使我们能够计算外推的介电常数ε 0 = 7.62和ε ∞ = 2.80，和本征品质因数Q Ù × ˚F = 154赫兹，在10GHz。所得值表明，该材料可以归类为低k高Q陶瓷，在微波电路中有潜在的应用。
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