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KTa1-xNbxO3晶体的同步辐射X射线白光形貌术研究

胡正伟 蒋树声 冯端 王继扬 管庆才 刘耀岗 蒋建华

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KTa1-xNbxO3晶体的同步辐射X射线白光形貌术研究

胡正伟, 蒋树声, 冯端, 王继扬, 管庆才, 刘耀岗, 蒋建华

WHITE-BEAM X-RAY TOPOGRAPHY STUDY OF KTa1-xNbxO3 CRYSTAL WITH SYNCHROTRON RADIATION

HU ZHENG-WEI, JIANG SHU-SHENG, FENG DUAN, WANG JI-YANG, GUAN QING-CAI, LIU YAO-GANG, JIANG JIAN-HUA
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  • 利用北京同步辐射光源,对居里点在室温附近的掺铁钽铌酸钾光折变晶体进行了X射线白光形貌术研究.观察显示,晶体内部除了杂质偏析物和一组沿[010]方向的生长层外,还有一组与之正交的畴组态,后者被发现不满足一般面缺陷的衬度消光规律,仅有异常散射效应揭示其衬度.利用同步辐射波长的可调谐性,揭示了该组畴随波长改变其衍时衬度变化的规律,而且畴的衍射强度被发现违背Friedel定律.依据实验证据,这组畴被确认为180°铁电畴.对畴形成原因和晶体生长特性进行了讨论.
    The photorefractive Fe-dopoed KTa1-xNbxO3(KTN) with a Curie point near room temperature has been topographically studied by Beijing synchrotron radiation white-beam X-ray source. Besides inclusions and the [010] oriented growth bands present in KTN, a set of domains perpendicular to the growth bands is shown, the latter is found to disobey the vanishing rule of planar defects, and to be revealed only by X-ray anomalous scattering. A striking wavelength dependence of the domain contrast is shown by tuning the synchrotron radiation, and the contrast reversal of the domains is demonstrated in antiparallel reflections. The domains are ascertained to be 1800 ones. The origins of formation of the domains and the growth features in KTN are outlined.
    • 基金项目: 国家自然科学基金资助的课题.
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  • 文章访问数:  5274
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出版历程
  • 收稿日期:  1993-10-18
  • 刊出日期:  1994-06-05

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