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Dronskowski, R.*; Br
ckel, T.*; Kohlmann, H.*; Avdeev, M.*; Houben, A.*; Meven, M.*; Hofmann, M.*; 神山 崇*; Zobel, M.*; Schweika, W.*; et al.
Zeitschrift fr Kristallographie; Crystalline Materials, 239(5-6), p.139 - 166, 2024/06
中性子回折は結晶線や関連物質の構造を決定するための最も強力な技術のひとつと考えられる。中性子は核分裂、核破砕、低エネルギー核反応から放出され、粉末回折法、飛行時間法、単結晶法、その他、結晶や磁性体の構造を明らかにするのに最適な技術として利用することができる。高い中性子束と十分な輝度を利用した中性子回折では、散漫散乱にも活用でき、オペランド実験や、新物質の高圧実験にも適している。また中性子の同位体を区別、磁性を決定できるという利点は、例えばエネルギー変換・貯蔵材料、磁性体、タンパク質構造における軽元素の構造とダイナミクスに関する重要な科学的疑問に答える上でも極めて重要である。この論文では、中性子回折の現状を要約するとともに、最近の進歩や新しいアイデア、例えば新しい装置の設計、そしてそこから派生するものについてもレビューする。
新井 正敏*; Andersen, K. H.*; Argyriou, D. N.*; Schweika, W.*; Zanini, L.*; Harjo, S.; 神山 崇*; 原田 正英
Journal of Neutron Research, 23(4), p.215 - 232, 2021/12
The general performance of diffractometers at the first long pulse spallation source ESS, is compared with their counterparts at J-PARC, a short pulse spallation source. The difference in the inherent pulse structure of these neutron sources presents opportunities for new concepts for instrumentation, where performance does not scale simply with source power. The article describes advantages and disadvantages of those diffractometers, adapting to the very different source characteristics. We find that the two sources offer comparable performance in flux and resolution when operating in high-resolution mode. ESS offers significant advantages in tunability and flexibility, notably in the ability to relax resolution in order to increase flux for a given experiment. On the other hand, J-PARC instruments perform very well in spite of the lower source power and allow better access to epithermal neutrons, of particular interest for PDF analysis of diffraction data.
Tb
Ti
O
Chang, L.-J.; Schweika, W.*; Kao, Y.-J.*; Chou, Y. Z.*; Per
on, J.*; Brckel, T.*; Yang, H. C.*; Chen, Y. Y.*; Gardner, J. S.*
Physical Review B, 83(14), p.144413_1 - 144413_7, 2011/04
被引用回数：9 パーセンタイル：36.84(Materials Science, Multidisciplinary)Polycrystalline samples of HoTbTiO (0 
2) have been prepared and characterized for their structural and magnetic properties. The parent compounds of this solid solution are the spin ice HoTiO and the spin liquid TbTiO. The results of specific heat, elastic and inelastic neutron scattering measurements suggest that the very strong single-ion effects of HoTiO and TbTiO persist in the HoTbTiO (0 2) solid solution, whereas the Tb-Ho correlations are weak, resulting in small shifts in the energy scales but with no dramatic effect on the bulk properties.
