Ferroelectric and dielectric properties of 0.62Pb(Mg_1/3Nb_2/3)O₃-0.38PbTiO₃ thin films on La_0.6Sr_0.4CoO₃ buffered Si substrates

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• 作者：Yanxue Tang^a ; ^{yanxuetang@yahoo.com.cn} ; Dan Zhou^a ; Feifei Wang^a ; Dazhi Sun^a ; Wangzhou Shi^a ; Haosu Luo^b ; Gujin Hu^c ; ^{hugj@mail.sitp.ac.cn}
• 关键词：0.62PMN&ndash ; 0.38PT thin films ; La0.6Sr0.4CoO3 buffered Si substrates ; Ferroelectric and dielectric properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 July, 2012
• 卷：529
• 期：Complete
• 页码：44-48
• 文件大小：987 K

摘要

0.62Pb(Mg_1/3Nb_2/3)O₃-0.38PbTiO₃ (0.62PMN-0.38PT) thin films were deposited on La_0.6Sr_0.4CoO₃ (LSCO) buffered Si substrates by radio-frequency magnetron sputtering. It has been found that the 0.62PMN-0.38PT films show a (1 0 0) preferred oriented perovskite phase on (1 0 0) preferred oriented LSCO layer while they show a (1 1 0) preferred perovskite phase on (1 1 0) preferred oriented LSCO layer. The formations of such preferred orientations are attributed to co-contribution of the surface energy and lattice-match interface energy. The (1 1 0) preferred oriented 0.62PMN-0.38PT film exhibits a relatively low remnant polarization of 12.1 渭C/cm² while a low coercive field of 27 kV/cm compared with (1 0 0) preferred oriented one (13.9 渭C/cm², 56 kV/cm). Moreover, the (1 1 0) preferred oriented film shows a larger dielectric constant of 鈭?260 and a lower dielectric loss of 0.09 at 1 kHz than those of (1 0 0) preferred oriented one (1050 and 0.19). The results demonstrate that the enhanced ferroelectric and dielectric properties are achieved for (1 1 0) preferred oriented film, which is correlated with large anisotropy in the texture films induced by LSCO buffer layers.