The dielectric properties of La(Mg0.5Ti0.5)O3 ceramics studied by Raman-scattering, infrared reflectivity spectroscopy, and first-principles calculations

doi:10.1088/0953-8984/23/22/225901

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/55591

Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/55591

Title:	The dielectric properties of La(Mg0.5Ti0.5)O3 ceramics studied by Raman-scattering, infrared reflectivity spectroscopy, and first-principles calculations
Authors:	Liu, Hsiang-Lin;Hsueh, Hung-Chung;Lin, I-Nan;Yang, Ming-Ti;Lee, Wei-Chung;Chen, Yi-Chun;Chia, Chia-Ta;Cheng, Hsiu-Fung
Contributors:	淡江大學物理學系
Date:	2011-05-17
Issue Date:	2011-08-23 23:04:12 (UTC+8)
Publisher:	Bristol: Institute of Physics Publishing Ltd.
Abstract:	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.
Relation:	Journal of Physics: Condensed Matter 23(22), 225901(8pages)
DOI:	10.1088/0953-8984/23/22/225901
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

Files in This Item:

File	Description	Size	Format
0953-8984_23(22)p225901.pdf		891Kb	Adobe PDF	220	View/Open
index.html	期刊資訊	0Kb	HTML	336	View/Open
index.html	館藏資訊	0Kb	HTML	274	View/Open
index.html		0Kb	HTML	246	View/Open

Loading...