钙钛矿型外延薄膜中两种分解失配位错的HRTEM研究  

Two types of dissociated misfit dislocations in epitaxial Ba_(0.3)Sr_(0.7)TiO_3 thin films grown on(001) LaAlO_3

作　　者：张永成[1] 叶万能[1] 夏临华[1] 卢朝靖[1] 

机构地区：[1]青岛大学纤维新材料与现代纺织国家重点实验室培育基地,青岛山东266071

出　　处：《电子显微学报》2009年第4期335-337,共3页Journal of Chinese Electron Microscopy Society

基　　金：山东省自然科学杰出青年基金(JQ200818);青岛市科技发展计划(08-1-3-13-jch)

摘　　要：在(001)LaAlO3上生长钙钛矿型Ba0.3Sr0.7TiO3外延薄膜近界面层,用HRTEM观察到多种新型的分解失配位错,其中两种较复杂的分解失配位错已见报道。本文介绍在该薄膜中观察到的另外两种有趣的分解失配位错。这两种失配位错都分解成两个柏格斯矢量b=(1/2)〈110〉的不全位错,都与(1/2)〈110〉层错相伴。这些不全位错对薄膜应变松弛都有贡献,其发生与Ba0.3Sr0.7TiO3薄膜的岛状成核和莫扎克生长有关。Two types of dissociated misfit dislocations in epitaxial Ba0.3 Sr0.7 TiO3 thin films grown on （001） LaAlO3 have been studied by high- resolution transmission electron microscopy. Each type of the misfit dislocations is dissociated into two partial dislocations with Burgers vectors of type （1/2）（110）. All the partials can relieve the localized misfit strain and they are interacted with （1/2）（110） stacking faults. The partials were generated during island nucleation and mosaic growth of the Ba0.3 Sr0.7 TiO3 film.

关 键 词：钙钛矿型结构 外延薄膜 失配位错 位错分解 高分辨透射电镜 

分 类 号：O484[理学—固体物理] O766[理学—物理]