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He, X.*; Kagi, Hiroyuki*; Komatsu, Kazuki*; Iizuka, Riko*; Okajima, Hajime*; Hattori, Takanori; Sano, Asami; Machida, Shinichi*; Abe, Jun*; Goto, Hirotada*; et al.
Journal of Molecular Structure, 1310, p.138271_1 - 138271_8, 2024/08
High-pressure responses of the O-D
F hydrogen bonds in deuterated magnesium hydroxyfluoride were investigated using neutron powder diffraction and Raman spectroscopy. The Rietveld analysis at ambient conditions revealed a chemical formula of Mg(OD)
F
and hydroxyl group/fluorine disorder (OD/F disorder) in the crystal structure, which gave rise to two hydrogen-bonding configurations. The Rietveld analysis showed the hydrogen-bonding geometries remains up to 9.8 GPa, indicating no pressure-induced strengthening of hydrogen bonds. The Raman spectra at ambient conditions showed three hydroxyl stretching bands at 2613, 2694, and 2718 cm
. The high frequencies of the O-D stretching modes indicated that the hydroxyls should be involved in weak or none hydrogen-bonding interactions. Up to 20.2 GPa, the mode initially centered at 2694 cm displayed a pressure-induced blue shift, revealing no strengthening of hydrogen bonds under compression. We discuss the existence of hydrogen bonds and the causes of the blue-shifting hydroxyls at ambient and at high pressures.
Liss, K.-D.*; Han, J.-K.*; Blankenburg, M.*; Lienert, U.*; Harjo, S.; Kawasaki, Takuro; Xu, P. G.; Yukutake, Eitaro*; Kawasaki, M.*
Journal of Materials Science, 23 Pages, 2024/00
Times Cited Count：0 Percentile：0(Materials Science, Multidisciplinary)
Mg and long-period stacking ordered phases in a Mg-Zn-Y alloy by hot-extrusion with low extrusion ratioHarjo, S.; Gong, W.; Aizawa, Kazuya; Kawasaki, Takuro; Yamasaki, Michiaki*
Acta Materialia, 255, p.119029_1 - 119029_12, 2023/08
Times Cited Count：7 Percentile：94.68(Materials Science, Multidisciplinary)Liss, K.-D.*; Xu, P. G.; Shiro, Ayumi*; Zhang, S. Y.*; Yukutake, Eitaro*; Shobu, Takahisa; Akita, Koichi*
Advanced Engineering Materials, 9 Pages, 2023/00
Liu, X. J.*; Xu, P. G.; Shiro, Ayumi*; Zhang, S. Y.*; Shobu, Takahisa; Yukutake, Eitaro*; Akita, Koichi*; Zolotoyabko, E.*; Liss, K.-D.*
Journal of Materials Science, 57(46), p.21446 - 21459, 2022/12
Times Cited Count：3 Percentile：36.97(Materials Science, Multidisciplinary)Shiro, Ayumi*; Shobu, Takahisa; Hagihara, Koji*; Watanabe, Masashi*
SPring-8/SACLA Riyo Kenkyu Seikashu (Internet), 10(5), p.438 - 446, 2022/10
no abstracts in English
Zn
Y
during compression and tensionHarjo, S.; Aizawa, Kazuya; Gong, W.*; Kawasaki, Takuro
Materials Transactions, 61(5), p.828 - 832, 2020/04
Times Cited Count：6 Percentile：35.8(Materials Science, Multidisciplinary)
X-ray and neutron diffraction methodsYamashita, Keishiro*; Komatsu, Kazuki*; Hattori, Takanori; Machida, Shinichi*; Kagi, Hiroyuki*
Acta Crystallographica Section C; Structural Chemistry (Internet), 75(12), p.1605 - 1612, 2019/12
Times Cited Count：7 Percentile：58.04(Chemistry, Multidisciplinary)A crystal structure of a high-pressure phase of magnesium chloride hexahydrate (MgCl 
6HO-II) and its deuterated counterpart (MgCl 6DO-II) have been identified for the first time by in-situ single-crystal X-ray and powder neutron diffraction. The crystal structure was analyzed by the Rietveld method for the neutron diffraction pattern based on the initial structure determined by single-crystal X-ray diffraction. This high-pressure phase has a similar framework to that in the known ambient-pressure phase, but exhibits some structural changes with symmetry reduction caused by a subtle modification in the hydrogen-bond network around the Mg(HO)
octahedra. These structural features reflect the strain in the high-pressure phases of MgCl hydrates.
investigation of the microstructure evolution in Long-Period-Stacking-Ordered (LPSO) magnesium alloys as a function of the temperatureM
this, K.*; Drozdenko, D.*; N
meth, G.*; Harjo, S.; Gong, W.*; Aizawa, Kazuya; Yamasaki, Michiaki*; Kawamura, Yoshihito*
Frontiers in Materials (Internet), 6, p.270_1 - 270_9, 2019/11
Times Cited Count：7 Percentile：30.32(Materials Science, Multidisciplinary) bulk samplesOkayasu, Satoru; Ikeda, Hiroshi*; Yoshizaki, Ryozo*
Physica C, 378-381(1-4), p.462 - 465, 2002/10
no abstracts in English
(g)Nakajima, Kunihisa; Arai, Yasuo
Journal of Nuclear Materials, 294(3), p.250 - 255, 2001/04
Times Cited Count：4 Percentile：33.39(Materials Science, Multidisciplinary)no abstracts in English
Tachi, Yoshiaki; Hirakawa, Yasushi; Kano, Shigeki; Yoshida, Eiichi
PNC TN9410 98-054, 57 Pages, 1998/01
It has been progressed as the Frontier Materials Research to research and develop ceramics to apply for several components of fast breeder reactor using liquid sodium as coolant instead of metallic materials. Grain boundary of ceramics has peculiar properties compared with matrix because most of ceramics are produced by hardening and firing their raw powders. Some previous researchers indicated that ceramics were mainly corroded at grain boundaries by liquid sodium, and ceramics could not be used under corrosive environment. Thus, it is the most important for the usage of ceramics in liquid sodium to improve corrosion resistance of grain boundaries. In order to develop the advanced ceramics having good sodium corrosion resistance among fine ceramics, which have recently been progressed in quality and characteristics remarkably, sodium corrosion behaviors of typical sintering additives such as MgO, YO and AIN etc. have been examined and evaluated. As a result, the followings have been clarified and some useful knowledge about developing advanced ceramics having good corrosion resistance against liquid sodium has been obtained. (1)Sodium corrosion behavior of MgO depended on Si content. Samples containing large amount of Si were corroded severely by liquid sodium, whereas others with low Si contents showed good corrosion resistance. (2)Both YO and AIN, which contained little Si, showed good sodium corrosion resistance. (3)MgO, YO and AIN ale thought to be corroded by liquid sodium, if they contain some SiO. Therefore, in order to improve sodium corrosion resistance, it is very important for these ceramics to prevent the contamination of matrix with SiO through purity contlol of their raw powders.
Utsumi, Wataru; Weidner, D.*; Liebermann, R.*
Geophysical Monograph 101 (Properties of Earth and Planetary Materials at High Pressure and Temperature), p.327 - 333, 1998/00
no abstracts in English
Hayashi, Takumi; Nakamura, Hirofumi; Konishi, Satoshi; Inoue, Masahiko*; Hirata, Kazuhiro*; Okuno, Kenji; Naruse, Yuji; Anderson, J. L.*; Sherman, R. H.*; Willms, R. S.*; et al.
JAERI-M 93-083, 54 Pages, 1993/03
no abstracts in English
-AlO and MgO single crystals*; Aoki, Yasushi; Yoda, Osamu; Nagai, Shiro; D.M.Rueck*
Nuclear Instruments and Methods in Physics Research B, 80-81, p.1168 - 1170, 1993/00
Times Cited Count：3 Percentile：43.05(Instruments & Instrumentation)no abstracts in English
U
O
solid solutionsHinatsu, Yukio
Journal of Solid State Chemistry, 95, p.430 - 437, 1991/00
Times Cited Count：5 Percentile：27.7(Chemistry, Inorganic & Nuclear)no abstracts in English
*; Kitazawa, Hideo*
JAERI-M 90-169, 19 Pages, 1990/10
no abstracts in English
; ; Tachikawa, Enzo;
Bunseki Kagaku, 37(1), p.7 - 11, 1988/01
no abstracts in English
U
O
by EMF measurements, 2; Properties at low magnesium concentrations; Fujino, Takeo; Tagawa, Hiroaki
Journal of Solid State Chemistry, 30(3), p.265 - 273, 1979/00
Times Cited Count：16no abstracts in English
UO by EMf measurements, 1; Properties at high magnesium concentrationsFujino, Takeo; ; Tagawa, Hiroaki
Journal of Solid State Chemistry, 24(1), p.11 - 19, 1978/01
Times Cited Count：30no abstracts in English
