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平田 早紀子*; 日下 良二; 明地 省吾*; 為国 誠太*; 奥寺 洸介*; 浜田 昇賢*; 坂本 知優*; 本田 匠*; 松下 高輔*; 村松 悟*; et al.
Inorganic Chemistry, 62(1), p.474 - 486, 2023/01
被引用回数：0 パーセンタイル：0.01(Chemistry, Inorganic & Nuclear)A new technique, surface-enhanced infrared absorption (SEIRA) spectroscopy, was used for the structural investigation of lanthanide (Ln) and actinide (An) complexes containing organic ligands. We synthesized thiol derivatives of organic ligands with coordination sites similar to those of diglycolamide (DGA), Cyanex-272, and 
-tetrakis(2-pyridinylmethyl)-1,2-ethanediamine (TPEN), which have been used for separating Ln and An through solvent extraction. These ligands were attached on a gold surface deposited on an Si prism through S-Au covalent bonds; the gold surface enhanced the IR absorption intensity of the ligands. Aqueous solutions of Ln (Eu
, Gd, Tb) and An (Am) ions were loaded onto the gold surface to form ion complexes. The IR spectra of the ion complexes were obtained using FT-IR spectroscopy in the attenuated total reflection mode. In this study, we developed a new sample preparation method for SEIRA spectroscopy that enabled us to obtain the IR spectra of the complexes with a small amount of ion solution (5 
L). This is a significant advantage for the IR measurement of radiotoxic Am complexes. In the IR spectra of DGA, the band attributed to C=O stretching vibrations at 
1630 cm
shifted to a lower wavenumber by 20 cm upon complexation with Ln and An ions. Moreover, the amount of the red-shift was inversely proportional to the extraction equilibrium constant reported in previous studies on solvent extraction. The coordination ability of DGA toward Ln and An ions could be assessed using the band position of the C=O band. The Cyanex-272- and TPEN-like ligands synthesized in this report also showed noticeable SEIRA signals for Ln and An complexes. This study indicates that SEIRA spectroscopy can be used for the structural investigation of ion complexes and provides a microscopic understanding of selective extraction of Ln and An.
熊谷 正芳*; 内田 知宏*; 村澤 皓大*; 高村 正人*; 池田 義雅*; 鈴木 裕士; 大竹 淑恵*; 浜 孝之*; 鈴木 進補*
Materials Research Proceedings, Vol.6, p.57 - 62, 2018/10
被引用回数：0 パーセンタイル：0.18(Metallurgy & Metallurgical Engineering)The convergence behavior of the parameters related to microstructural characteristics 
-
was studied during optimizations in a common line profile analysis software program based on the convolutional multiple whole profile (CMWP) method. The weighted sums of squared residual (WSSR) was a criterion of the optimization. The parameters 
and 
, which are related to the dislocation density and to the crystallite size, respectively, strongly affect the line profile shape. Therefore, the distributions of WSSRs on the space parameters and were first observed. The variation trajectory of parameters and during iterative calculations with several values of parameter was then observed, along with the variations when all of the parameters were variable. In the case where only three parameters were variable, we found that a smaller initial value of should be chosen to ensure stability of the calculations. In the case where all parameters were variable, although all of the results converged to similar values, they did not precisely agree. To attain accurate optimum values, a two-step procedure is recommended.
村澤 皓大*; 高村 正人*; 熊谷 正芳*; 池田 義雅*; 鈴木 裕士; 大竹 淑恵*; 浜 孝之*; 鈴木 進補*
Materials Transactions, 59(7), p.1135 - 1141, 2018/07
被引用回数：7 パーセンタイル：36.72(Materials Science, Multidisciplinary)Neutron diffraction profile analysis using the whole profile fitting method is useful for obtaining microscopic information on metallic materials. To determine an appropriate fitting approach for obtaining reasonable and non-arbitrary results, we applied diffraction line profile analyses using the Convolutional Multiple Whole Profile (CMWP) method to diffraction patterns obtained using the Engineering Materials Diffractometer (TAKUMI, BL19) at the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). The tensile specimens of 780 MPa grade bainitic steel were uniaxially stretched until the plastic strain reached a value of 0.05. We performed CMWP analyses on the obtained diffraction patterns during tensile test with various initial parameters of dislocation density and crystallite size. These parameters were optimized in the fitting procedures to minimize the weighted sums of squared residuals (WSSRs). Following this approach, we found that unsuitable initial parameter values resulted in unreasonable convergence. Therefore, initial fitting parameters should be chosen to ensure that the initial profiles are as broad as possible. Reasonable results were obtained following this suggestive approach even when the strain anisotropy parameter is set to arbitrary values.
須長 秀行*; 高村 正人*; 池田 義雅*; 大竹 淑恵*; 浜 孝之*; 熊谷 正芳*; 鈴木 裕士; 鈴木 進補*
Journal of Physics; Conference Series, 734(Part B), p.032027_1 - 032027_4, 2016/09
被引用回数：0 パーセンタイル：0.03(Physics, Applied)フェライト鋼における延性破壊のミクロ挙動を評価するために中性子回折実験を行った。引張試験の破断までの過程において、ネッキングにより体積減少する場所の回折パターンの連続的な変化を測定した。その結果、塑性変形の増加に伴い、引張方向に(110)方位の向く結晶粒の数が増加する様子が見られた。ネッキングの発生に伴い、その増加率の減少が見られることから、ネッキングの発生により集合組織の発達機構が変化すると考えられる。
高村 正人*; 池田 義雅*; 須長 秀行*; 竹谷 篤*; 大竹 淑恵*; 鈴木 裕士; 熊谷 正芳*; 浜 孝之*; 大場 洋次郎*
Journal of Physics; Conference Series, 734(Part B), p.032047_1 - 032047_4, 2016/08
被引用回数：5 パーセンタイル：86.44(Physics, Applied)中性子回折法は、中性子線の優れた透過能を活かすことで、金属材料のバルク集合組織を測定できる技術として知られている。しかしながら、この測定技術は、原子炉や加速器施設などの大型実験施設を必要とするため、あまり広く利用されていないのが現状である。一方、理研小型中性子源(RANS)は、実験室レベルで容易に利用できる中性子源として開発されている。本研究では、RANSを用いることにより、塑性変形した鋼板の集合組織の変化を捉えることに成功した。本結果は、金属材料のミクロ組織解析に対する小型中性子源の可能性を示すものであり、塑性変形挙動のより良い理解につながるものと期待される。
徐 平光; Wang, Y. W.*; Su, Y. H.; 岩本 ちひろ*; Wang, H. H.*; 浜 孝之*; 柴山 由樹; 土川 雄介; Parker, J. D.*; 甲斐 哲也; et al.
no journal, ,
For achieving the carbon neutralization through reducing the greenhouse gas emission, the liquefied natural gas (LNG) has been widely employed as the fuel for electric power plants. As economical cryogenic steel for LNG transport and storage, high-Mn steels have been paid much attention for a high possibility to replace expensive high-Ni martensite steels and high Ni-Cr austenite steels. Its superior cryogenic toughness is thought mostly due to the high thermal stability of austenite even at the LNG storage temperature and the evident mechanical twining effect during the cryogenic deformation. Since four-point bending deformation may induce elastoplastic strain and texture gradient distribution valuable to investigate the twinning effect, it is highly expected to carry out the in-situ/ex-situ cryogenic bending deformation experiment for clarifying the shear-induced twinning mechanism. As a preliminary research, cold-bent samples of high-Mn austenite thick steel plates at room temperature were employed to evaluate the twinning-induced shear band microstructure and confirm the 2D mapping of texture gradient distribution using time-of-flight (TOF) Bragg-edge transmission imaging. Comparably, the quantitative change in triaxial strains and crystallographic texture characteristics at five different regions along the bend radius was evaluated for reference using the angle-dispersive neutron diffraction. The conventional electron backscattering diffraction (EBSD) was employed to provide the direct morphologic information of gradient microstructure of cold-bent high-Mn steel plates. The RADEN neutron transmission profiles obtained from the inner surface layer to the 1/2 thickness layer of cold bent sample show an very interesting preferred orientation charactersitics, quite similar with the density distributions of corresponding orienations of complete pole figures obtained from RESA.
