弛豫铁电0.74Pb(Mg_(1/3)Nb_(2/3))O_3-0.26PbTiO_3薄膜的微结构和光学性能(英文)  

Microstructures and optical properties of relaxor ferroelectric 0.74Pb(Mg_(1/3)Nb_(2/3))O_3-0.26PbTiO_3 thin films

作　　者：田玥[1] 唐艳学[1] 周丹[1] 胡志娟[1] 王飞飞[1] 陈心满[1] 刘锋[1] 王涛[1] 谢东珠[1] 孙大志[1] 石旺舟[1] 胡古今[2] 孔伟金[3] 

机构地区：[1]上海师范大学光电材料与器件重点实验室,上海200234 [2]中国科学院上海技术物理研究所红外物理国家重点实验室,上海200083 [3]青岛大学物理科学学院,山东青岛266071

出　　处：《红外与毫米波学报》2012年第4期289-293,共5页Journal of Infrared and Millimeter Waves

基　　金：Supported by National Natural Science Foundation of China(60807036,10774154,11074265,10804060);the "Chenguang" Program of Shanghai Educational Development Foundation of China(2007CG57);the Science and Technology Commission of Shanghai Municipality (10ZR1422300);Shanghai Municipal Education Commission(11YZ83)

摘　　要：采用磁控溅射法,选用LaNi O3作为缓冲层,在硅基片上制备出了0.74Pb(Mg1/3Nb2/3)O3-0.26PbTiO3弛豫铁电薄膜.研究了沉积温度对薄膜的微结构和光学性能的影响.其中,沉积温度为500oC时制备的薄膜,不仅具有纯的钙钛矿结构,高度(110)择优取向、致密、无裂纹的形貌、而且具有最大的剩余极化,大小为17.2μC/cm2.使用柯西模型进行拟合反射谱,分析得到薄膜的折射率和消光系数.在波长为633 nm时,500oC沉积的薄膜的折射率大小为2.41.另外,薄膜的光学带隙在2.97～3.22 eV范围内.并初步讨论了这些薄膜的光学性能的差异.Relaxor ferroelectric 0.74Pb （Mg1/3 Nb2/3 ） O3-0. 26PbTiO3 thin films were prepared on LaNiO3-buffered sili- con substrates by radio-frequency magnetron sputtering. The effect of deposition temperature on films microstructures and optical properties was investigated. The sample deposited at 500 ℃ exhibits not only a pure perovskite phase, highly （110）-preferred orientation, and dense and crack-free morphology, but also the largest average remnant polarization of 17.2 μC/cm2 among all investigated films. With Cauchy model the refractive indices and extinction coefficients for these specimens have been obtained by fitting experimental reflectance spectra. At a wavelength of 633 nm, the value of re- fractive index 2.41 was obtained for the thin films deposited at 500 ℃. In addition, optical band gaps of the films are in the range of 2.97-3.22 eV. A preliminary discussion has been carded out on the difference in the optical properties of these films.

关 键 词：PMN-0.26PT铁电薄膜 折射率 消光系数 

分 类 号：O469[理学—凝聚态物理]