Structure of Lattice-Matched Fluoride Films

晶格匹配氟化物薄膜的结构

• 批准号: 60460231
• 负责人: HASHIZUME Hiroo
• 金额: $ 3.97万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60460231/
• 关键词: Mixed Fluoride; Thin Film; X-Ray Diffraction; Standing Wave; 構造解析; 格子準整合形弗化物混晶; エピタキシー結晶の界面原子構造; 表面X線定在波法; 微小入射角X線回折

The atomic structure of a single-crystal Ca_xSr_<1-x>F_2 (x = 0.43) film grown on GaAs(111)B surface has been determined with the X-ray standing-wave technique. A new method has been applied which allows complete analysis of mismatched structures using a single specimen. (Ca, Sr) atoms at the interface are found seven-coordinated, supporting the previously proposed growth model of epitaxial cubic fluoride films. The atomic layer spacing across the interface is contracted by 0.37 <Ang> compared with that calculated from the bulk bond lengths. The film is strained in such a way that the (111) interplanar distance is contracted by 0.28 %, although bulk mixed fluoride exactly lattice matches GaAs at room temperature, The study is based on a theoretical re-investigation of the standing-wave position with respect to atomic planes in absorbing non-centrosymmetric crystals.

通过X射线驻波技术确定了在GAAS（111）B表面上生长的单晶CA_XSR_ <1-X> F_2（x = 0.43）的单晶结构。已经应用了一种新方法，该方法允许使用单个标本对不匹配的结构进行完整分析。 （Ca，sr）界面处的原子被发现七个配位，支持了前期氟化物薄膜的先前提出的生长模型。与根据块状键长度相比，跨界面的原子层间距与0.37 <ang>收缩。该薄膜的紧张方式使得（111）间间距离收缩为0.28％，尽管散装混合氟化物恰好在室温下与GAAS相匹配，但该研究基于对原子平面的理论重新调查，在吸收非中心含量晶体方面，对原子平面进行了对原子平面的重新调查。

项目成果

Y. Saitoh: Japanese Journal of Applied Physid. 27. (1988)

Y. Saitoh：日本应用物理学杂志。

O.Sakata: Report RLEMTIT. 12. (1987)

O.Sakata：报告 RLEMTIT。

H.Hashizume: Acta crystallographica. A43. (1987)

H.Hashizume：晶体学报。

Yoshiharu Saitoh, Hiroo Hashizume and Kazuo Tsutsui: "Structure Analysis of Lattice-Matched Ca_xSr_<1-x>F_2 Epilayers by the X-Ray Standing- Wave Method" Japanese Journal of Applied Physics. 27. (1988)

Yoshiharu Saitoh、Hiroo Hashizume 和 Kazuo Tsutsui：“通过 X 射线驻波法对晶格匹配 Ca_xSr_<1-x>F_2 外延层进行结构分析”《日本应用物理学杂志》。

O.Sakata: Acta crystallographica. A43. (1987)

O.Sakata：晶体学报。