The dielectric properties of La(Mg0.5Ti0.5)O3 ceramics studied by Raman-scattering, infrared reflectivity spectroscopy, and first-principles calculations
學年 99
學期 2
出版（發表）日期 2011-05-17
作品名稱 The dielectric properties of La(Mg0.5Ti0.5)O3 ceramics studied by Raman-scattering, infrared reflectivity spectroscopy, and first-principles calculations
作品名稱（其他語言）
著者 Liu, Hsiang-Lin; Hsueh, Hung-Chung; Lin, I-Nan; Yang, Ming-Ti; Lee, Wei-Chung; Chen, Yi-Chun; Chia, Chia-Ta; Cheng, Hsiu-Fung
單位 淡江大學物理學系
出版者 Bristol: Institute of Physics Publishing Ltd.
著錄名稱、卷期、頁數 Journal of Physics: Condensed Matter 23(22), 225901(8pages)
摘要 La(Mg0.5Ti0.5)O3 (LMT) ceramics were prepared by either the solid-state reaction (LMT)SS or the citric-acid chemical method (LMT)CA. A combination of Raman scattering, infrared reflectivity, and first-principles calculations was carried out to elucidate the correlation between lattice dynamics and the dielectric properties of these materials. Twelve Raman-active phonons are observed in both samples, displaying similar frequency positions. Interestingly, the Ag phonon (g11 mode) of (LMT)SS at about 717 cm − 1 involving the oxygen octahedron breathing vibrations demonstrates a narrower linewidth, suggesting its better crystallinity. Furthermore, an infrared-active u2 phonon band due to the vibrations of OI and OII layers, which possesses the largest oscillator strength, exhibits stronger intensity for (LMT)SS, as compared with those for (LMT)CA. Additionally, the Q × f values (the product of dielectric Q values and measurement frequency) of (LMT)SS estimated from either microwave cavity or infrared spectroscopic measurements are larger than those of (LMT)CA. These results indicate that the better coherence of lattice vibrations in (LMT)SS leads to its higher Q × f value, providing evidence for a strong connection between optical spectroscopic behavior and microwave dielectric characteristics in these materials.
關鍵字
語言 en_US
ISSN 0953-8984; 1361-648X
期刊性質 國外
收錄於 SCI EI
產學合作
通訊作者 Liu, Hsiang-Lin; Hsueh, Hung-Chung
審稿制度
國別 GBR
公開徵稿
出版型式 紙本
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