Short Range Order in Interstitial Alloys.

间隙合金中的短程有序。

• 批准号: 61550472
• 负责人: YAMAGUCHI Sadae
• 金额: $ 1.02万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550472/
• 关键词: Short-Range Order; Local Atomic Arrangement; Neutron Diffraction; Diffuse Scattering; Interstitial Alloy; Interstitial Ordering; 固容体のクラスタリング; 中性子回析; 中性子散漫錯乱; 水素化物; 格子間原子クラスター

1) Short-range order parameters for oxygen arrangement in single crystal of Tio_<3.32> were determined by measurements of elastic neutron diffuse scattering. The short range order term were separated from the total diffuse intensity by least squares fit of the experimental intensity with a theoretical one. The first-, third and fifth-neighbor atomic arrangement of the oxygen atom has a preference to be surrounded by vacancies rather than by oxygen atoms. While, the second- and fourth-neighbor site are occupied preferentially by oxygen atoms.2) Short-range order parameters for deuterium arrangement in single crystal of VD_<0.81> were determined by measurements of elastic neutron diffuse scattering. The preferential configrations of vacancy-deuterium atom pair are found at first-, second-, and thirdneighbors of tetrahedral interstitial sites of the host vanadium lattice whereas the deuterium-deuterium atom pairs occur at the fourth neighbors. These features are similar to those in the ordered structure below T_c.3) Local atomic arrangements of nitrogen atoms in Nb-N and Ta-N alloys have been studied by neutron small angle scattering. The diffuse intensity of low Q region revealed the existence of the nitorogen atom clasters.

1）通过测量弹性中子弥漫性散射来确定TIO_ <3.32>单晶中氧排列的短距离顺序参数。短距离阶项与总弥散强度与实验强度的最小二乘与理论强度分开。氧原子的第一个，第三和第五邻居原子排列偏爱被空缺而不是氧原子包围。而，第二和第四邻居位点优先被氧原子占据。2）通过测量弹性中子弥漫性散射的测量，确定了VD_ <0.81>单晶体中氘排列的短距离顺序参数。在第四个邻居出现在宿主钒晶面晶晶质的四面体间隙位点的第一，第二和第三个骨位，而在第四个邻居则发现了宿主钒晶面晶面晶面晶晶晶晶片的四面体间隙位点的优先驱动。这些特征类似于T_C.3）NB-N和TA-N合金中氮原子的局部原子布置的相似之处。低Q区域的弥漫强度揭示了notorogen原子簇的存在。

项目成果

Yasuaki SUGIZAKI; Tsuyoshi KAJITANTI; Sadae YAMAGUCHI: "Neutron Diffraction Study on the Short Range Order in VD_<0.81> Single Crystal." Solid State Communication. Submitted.

杉崎康明；