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B
( =Yb, La) observed by multiple-wavelength neutron holography上地 昇一*; 大山 研司*; 福本 陽平*; 金澤 雄輝*; 八方 直久*; 原田 正英; 稲村 泰弘; 及川 健一; 松浦 航*; 伊賀 文俊*; et al.
Physical Review B, 102(5), p.054104_1 - 054104_10, 2020/08
被引用回数：7 パーセンタイル：44.34(Materials Science, Multidisciplinary)We have succeeded in visualizing the local atomic structures around Sm in B ( =Yb, La), in which a rareearth atom is located in the boron cage, using the newly developed technique for local structure investigations, multiple-wavelength neutron holography in a pulsed neutron facility. From the local atomic structures, we were able to clarify the behavior of Sm in the boron cage. Doped Sm in YbB
fluctuates within the boron cage with a mean displacement of 0.25(4) 
, while that of Sm in LaB is approximately 0.15 . The Sm doping causes the fluctuation of the first-nearest-neighbor B with a mean displacement of 0.28 , while its effect on La, Yb, and the rest of the boron atoms is negligible. These are the first observations of the local behavior of doped rare-earth atoms and B in rare-earth borides with boron cages.
佐野 雄一; 渡部 創; 松浦 治明*; 名越 航平*; 新井 剛*
Journal of Nuclear Science and Technology, 54(10), p.1058 - 1064, 2017/10
被引用回数：5 パーセンタイル：37.06(Nuclear Science & Technology)ポリマー架橋度が吸着材の吸着・溶離性能に与える影響についてポリマー架橋度をパラメータとした吸着材を用いた試験により評価するとともに、その要因をSTXM分析及びEXAFS分析により考察した。吸着材中に形成された金属錯体構造については、ポリマー架橋度により大きな違いは生じないことを確認した。一方、ポリマー架橋度の増加に伴いポリマーは細孔中に均一に広がる様子が認められるとともに、架橋度が高い条件では細孔が狭小化し、水分子が捕捉されやすくなるため、溶離率が低下するものと考えられた。
安倍 諒治*; 名越 航平*; 新井 剛*; 渡部 創; 佐野 雄一; 松浦 治明*; 高木 秀彰*; 清水 伸隆*; 江夏 昌志*; 佐藤 隆博*
Nuclear Instruments and Methods in Physics Research B, 404, p.173 - 178, 2017/08
被引用回数：5 パーセンタイル：44.54(Instruments & Instrumentation)Molybdenum and zirconium obstruct the efficient recovery of minor actinides (MA(III): Am(III) and Cm(III)) by extraction chromatography; hence, the removal of these elements prior to MA(III) recovery is desirable. The use of an adsorbent impregnated with bis(2-ethylhexyl) hydrogen phosphate (HDEHP) for Mo and Zr decontamination was evaluated in this report. The adsorption/elution and column separation experiments showed that Mo and Zr in the simulated HLLW were selectively adsorbed on the particles, and that Mo was eluted by H
O. EXAFS analysis and SAXS patterns of the adsorbent containing Zr revealed that the Zr-HDEHP complex had a crystal-like periodic structure similar to the structure of the precipitate produced in the solvent extraction system. Micro-PIXE analysis revealed that distribution of the residual Zr on the adsorbent was uniform.
