X-ray emission from metal oxide crystals under dynamical electron diffraction conditions and its application to structure analysis

动态电子衍射条件下金属氧化物晶体的X射线发射及其在结构分析中的应用

• 批准号: 09650721
• 负责人: MATSUMURA Syo
• 金额: $ 2.05万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650721/
• 关键词: Magnesia; Spinel crystal; Electron diffraction; X-ray spectroscopy; Electron channeling; CBED; Crystal structure; Radiation damage; 原子散乱因子

This project aimed for a new method of structural analysis on local areas in disordered metal oxide crystals, such as irradiated MgO, Al2O3 and MgO・Al2O3, promoting a better understanding on the interactions of dynamical elastic scattering of incident electrons with inelastic scattering process generating characteristic x-rays.The project research started in 1997 with examination on the atomic scattering factors of MgィイD1+ィエD1 and OィイD12-ィエD1, through the measurement of critical voltage for 400 reflection of MgO by high voltage electron diffraction. The measured value of critical voltage 826 ± 3 kV is in quite good agreement with estimation based on the values of atomic scattering factors fs and B-factors recently obtained by Rez et al. And Zuo. It was therefore concluded that their values of f and B are reliable in quantitative analysis of dynamical electron scattering in MgO and related ceramic compounds.In the second year 1998, the electron channeling enhanced x-ray microanalysis an … More d the large angle convergent beam electron diffraction were simultaneously employed to determine cation configuration in Mgo・nAl2O3 crystals as a function of n and irradiation does with 1 MeV electrons or 300 KeV OィイD1+ィエD1 ions. The cation distribution is hardly changed under irradiation with 1 MeV electrons to 1.9 dpa at 870K. On contrast significant displacements of cations are induced under irradiation with OィイD1+ィエD1 ions to 1.4 dpa at the same temperature.In the final year 1999, we examined high angular resolution electron channeling x-ray spectroscopy (HARECXS) as a proctical tool to locate lattice ions in spinel compounds. The orientation dependent intensity distribution of emitted x-rays obtained by HARECXS is so sensitive to ion configuration as to determine the occupation probabilities on specific sites in the crystal lattice accurately. HARECXS has revealed partially disordered cation arrangement in Mgo・nAl2O3 irradiated with 1 MeV NeィイD1+ィエD1 ions as a function of depth from the irradiated surface. Less

本项目旨在对无序金属氧化物晶体中的局部区域进行结构分析的新方法，例如辐照MgO、Al 2 O3和MgO·Al 2 O3，促进对入射电子的动态弹性散射与产生特征X射线的非弹性散射过程的相互作用的更好理解。该项目研究于1997年开始，用高压电子衍射法测定MgO的400 °反射临界电压，得到了MgO_（12）-MgO_（12）的临界电压。临界电压826 ± 3 kV的测量值与最近由Rez等人和Zuo根据原子散射因子fs和B因子值所作的估算值相当一致。1998年第二年，用电子沟道增强X射线微区分析方法，对MgO及相关陶瓷化合物的动态电子散射进行了定量分析，得到了f值和B值的可靠性 ...更多信息 用大角度会聚束电子衍射同时测定了Mgo·nAl_2 O_3晶体中阳离子构型随n和辐照剂量的变化。在870 K下，用1 MeV电子辐照到1.9dpa时，阳离子分布几乎没有变化。在1999年的最后一年，我们研究了高角分辨电子沟道X射线光谱（HARECXS）作为一种定位尖晶石化合物中晶格离子的proctical工具。由HARECXS获得的发射X射线的取向相关的强度分布是如此敏感的离子配置，以确定在晶格中的特定位置上的占领概率准确。HARECXS结果表明，在1 MeV Ne离子辐照下，MgO·nAl_2 O_3中的阳离子部分无序排列，并随离辐照表面深度的变化而变化。少

项目成果

Y.Tomokiyoko,S.Matsumura,et al.: "Energy filtering transmission electron microscopy using the new JEM-2010FEF"Journal of Microscopy. 194. 210-218 (1999)

Y.Tomokiyoko、S.Matsumura 等人：“使用新型 JEM-2010FEF 的能量过滤透射电子显微镜”显微镜杂志。

T. Soeda, S. Matsumura, Y. Tomokiyo, C. Kinoshita: "Critical voltage effect and production of characteristic x-ray in magnesia"Proc. Asian Sci. Seminar New Direction in Transmission Electron Microscopy and Nano-Characterization of Materials. 367-370 (1998

T. Soeda、S. Matsumura、Y. Tomokiyo、C. Kinoshita：“氧化镁中的临界电压效应和特征 X 射线的产生”Proc。

T.Soeda,S.Matsumura,et al.: "Quantitative electron diffraction study of cation configuration and irradiation induced displacement in magnesium- aluminate spine crystals"Journal of Electron Microscopy. 48. 531-536 (1999)

T.Soeda，S.Matsumura，等人：“镁铝酸盐脊柱晶体中阳离子构型和辐照诱导位移的定量电子衍射研究”电子显微镜杂志。

C. Kinoshita, S. Matsumura, et al.: "Irradiated microstructures of magnesium aluminate spinel and their controlling factors"MRS Symposium Proceedings. 540. 287-297 (1999)

C. Kinoshita、S. Matsumura 等人：“铝酸镁尖晶石的辐照微观结构及其控制因素”MRS 研讨会论文集。

T. Soeda, S. Matsumura, C. Knoshita, N. Zaluzec: "Cation disordering in magnesia aluminate spinel crystals under electron or ion irradiation"Journal of Nuclear Materials. (in press). (2000)

T. Soeda、S. Matsumura、C. Knoshita、N. Zaluzec：“电子或离子辐照下镁铝尖晶石晶体中的阳离子无序”核材料杂志。