教師資料查詢 | 類別: 期刊論文 | 教師: 林大欽 LING, DAH-CHIN (瀏覽個人網頁)

標題:Structural and optical studies of high dielectric constant (Na0.5A0.5)Cu3Ti4O12 (A=La and Bi)
學年96
學期2
出版(發表)日期2008/07/01
作品名稱Structural and optical studies of high dielectric constant (Na0.5A0.5)Cu3Ti4O12 (A=La and Bi)
作品名稱(其他語言)
著者Liang, K. C.; Liu, H. L.; Yang, H. D.; Mei, W. N.; 林大欽; Ling, D. C.
單位淡江大學物理學系
出版者Institute of Physics (IOP)
著錄名稱、卷期、頁數Journal of Physics: Condensed Matter 20(27), pp.275238(8 pages)
摘要We report x-ray powder diffraction and temperature-dependent infrared reflectivity measurements of (Na0.5La0.5)Cu3Ti4O12 and (Na0.5Bi0.5)Cu3Ti4O12 in order to investigate the origin of their lower room-temperature dielectric constants in comparison with the giant value of CaCu3Ti4O12. Substituting Ca with Na/La or Na/Bi is found to decrease all Ti–O–Ti angles by the TiO6 octahedra tilts, resulting in an increase of the local structural disorder on the Na/La and Na/Bi compounds. Further, several infrared-active phonon modes show a broadening in their linewidths, reflecting that the coherency in these vibrational modes is degraded by disorder. Additionally, the lowest-frequency mode of the Ca material is observed to strengthen dramatically at low temperatures, but to a lesser extent in the Na/La and Na/Bi compounds. These results suggest the important role of the local structural disorder on the anomalous low-frequency dielectric response in these materials.
關鍵字
語言英文
ISSN0953-8984
期刊性質國外
收錄於
產學合作
通訊作者
審稿制度
國別英國
公開徵稿
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