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Kobayashi, Hiroki*; Komatsu, Kazuki*; Ito, Hayate*; Machida, Shinichi*; Hattori, Takanori; Kagi, Hiroyuki*
Journal of Physical Chemistry C, 130(25), p.8795 - 8805, 2026/06
Times Cited Count：0Ice IV, a metastable high-pressure phase of ice, rarely crystallizes from water and has therefore been called by a nickname, "will-o'-the-wisp," a tentative, ghostly form of ice. Here we report by experiments using water-in-oil emulsions that liquid water reproducibly and selectively crystallizes into ice IV at the homogeneous nucleation temperature (
) at pressures between 0.45 and 1.1 GPa. By tracking pressure-induced melting of ice Ih and immediate recrystallization, we show that liquid water preferentially crystallizes into ice IV even below . Thanks to high hydrostaticity and suppressed crystal growth in emulsified ice samples, reliable structure analyses for both ice IV and its potentially hydrogen-ordered state were achieved by neutron diffraction. The achievable degree of ordering in experiments was extremely low and nearly independent of the crystallization methods.
-iron at high pressures determined using 
neutron diffractionAoki, Katsutoshi*; Takano, Masahiro*; Fukuyama, Ko*; Kagi, Hiroyuki*; Machida, Akihiko*; Saito, Hiroyuki*; Hattori, Takanori; Sano, Asami; Funakoshi, Kenichi*
Physical Review B, 113(18), p.184440_1 - 184440_6, 2026/05
Times Cited Count：1 Percentile：86.01(Materials Science, Multidisciplinary)The temperature dependence of the magnetic moment of bcc -iron was investigated over the range 300-950 K at pressures of approximately 2 and 6 GPa by neutron powder diffraction. The 
Fe isotope, whose neutron scattering length is approximately half that of naturally abundant Fe, was employed to enhance the relative contribution of magnetic scattering. Curie temperatures (
) were determined to be 946(30) K, 838(50) K and 740(40) K at 2.1, 6.0 and 6.7 GPa, respectively, defining a magnetic phase boundary described by (K) = 1043 - 49(7)
+ 1.3(1.2)
. Upon heating at 6.7 GPa, the 
structural transition was observed to follow the magnetic transition. This transition sequence indicates that the magnetic phase boundary lies on the low-temperature side of the phase boundary. Accordingly, the transition corresponds to a structural transformation from paramagnetic bcc to paramagnetic fcc iron.
neutron diffraction mapping measurementYamashita, Takayuki*; Nagira, Tomoya*; Gong, W.; Kawasaki, Takuro; Harjo, S.; Ushioda, Kosaku*; Fujii, Hidetoshi*
ISIJ International, 66(5), p.673 - 684, 2026/04
Times Cited Count：0 Percentile：0.00(Metallurgy & Metallurgical Engineering)
neutron diffraction studyYamashita, Takayuki*; Koyama, Motomichi*; Gong, W.; Kawasaki, Takuro; Harjo, S.; Ushioda, Kosaku*; Fujii, Hidetoshi*
ISIJ International, 66(4), p.477 - 488, 2026/03
Times Cited Count：0 Percentile：0.00(Metallurgy & Metallurgical Engineering)Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Kawasaki, Takuro; Shibata, Akinobu*; Harjo, S.
Scripta Materialia, 273, p.117084_1 - 117084_6, 2026/03
Times Cited Count：4 Percentile：64.95(Nanoscience & Nanotechnology)Cho, K.*; Yamashita, Kippei*; Kakutani, Shinnosuke*; Saito, Takuma*; Sasaki, Taisuke*; Sawaizumi, Katsuhiko*; Okugawa, Masayuki*; Koizumi, Yuichiro*; Mayama, Tsuyoshi*; Kikukawa, Taichi*; et al.
Acta Materialia, 303, p.121696_1 - 121696_18, 2026/01
Times Cited Count：7 Percentile：80.50(Materials Science, Multidisciplinary)Zhu, L.*; Dong, W.*; Naeem, M.*; Kong, H.*; Hu, C.*; Fan, Z.*; Gong, W.; Harjo, S.; Lan, S.*; Wu, Y.*; et al.
Acta Materialia, 303, p.121734_1 - 121734_10, 2026/01
Times Cited Count：3 Percentile：51.29(Materials Science, Multidisciplinary) neutron diffraction mapping measurementYamashita, Takayuki*; Nagira, Tomoya*; Gong, W.; Kawasaki, Takuro; Harjo, S.; Ushioda, Kosaku*; Fujii, Hidetoshi*
Tetsu To Hagane, 111(17), p.1057 - 1071, 2025/12
Jing, Z.*; Yamaguchi, Toshio*; Machida, Shinichi*; Hattori, Takanori; Zhou, Y.*
Journal of Chemical Physics, 163(19), p.194505_1 - 194505_12, 2025/11
Times Cited Count：0 Percentile：0.00(Chemistry, Physical)Ion solvation in a range of gigapascal pressure is of great significance for high-pressure chemical synthesis and the circulation of matter within the Earth's interior. We perform neutron scattering (NS) experiments and molecular dynamics simulations of deuterated aqueous solutions of MCl (M = Li, Na, K, Rb, and Cs) at 0.1 MPa and 0.7 GPa/298 K. An empirical potential structure refinement method analyzes the NS data. Upon compression to 0.7 GPa, the outer-shell water molecules enter the nearest neighbor of ions, and the solvated ion clusters become denser. The hydration factor 
and static hydration number 
based on the orientation distribution of the water dipole in the first solvation shell, show that the compression weakens the hydration ability of the ions. Compression suppresses the diffusion of ions, particularly of the structure-breaking ions. The ionic diffusion coefficient 
residence time of water molecules 
and dynamic hydration number 
indicate that Rb
and Cs exhibit characteristics of structure-making ions under compression. The dynamic properties are more pressure-sensitive than the static structure.
Jeong, S. G.*; Kwon, J.*; Kim, E. S.*; Prasad, K.*; Harjo, S.; Gong, W.; Kawasaki, Takuro; Estrin, Y.*; Bouaziz, O.*; Hong, S. I.*; et al.
Materials Science & Engineering A, 942, p.148712_1 - 148712_11, 2025/10
Times Cited Count：2 Percentile：51.29(Nanoscience & Nanotechnology)
neutron diffractionLiu, Y.*; Yan, Z.*; Gao, Y.*; Li, Y.*; Gan, B.*; Harjo, S.; Gong, W.; Kawasaki, Takuro; Li, S.*; Wang, Y.-D.*
Microstructures (Internet), 5(4), p.2025096_1 - 2025096_15, 2025/10
Saito, Hiroyukki*; Machida, Akihiko*; Hattori, Takanori; Sano, Asami; Funakoshi, Kenichi*; Sato, Toyoto*; Orimo, Shinichi*; Aoki, Katsutoshi*
Physica B; Condensed Matter, 714, p.417234_1 - 417234_3, 2025/10
Times Cited Count：0 Percentile：0.00(Physics, Condensed Matter)Corrigendum to "Neutron diffraction study on the deuterium composition of nickel deuteride at high temperatures and high pressures" [Phys. B Condens. Matter. 587 (2020) 412153] was reported.
neutron diffraction studyYamashita, Takayuki*; Koga, Norimitsu*; Mao, W.*; Gong, W.; Kawasaki, Takuro; Harjo, S.; Fujii, Hidetoshi*; Umezawa, Osamu*
Materials Science & Engineering A, 941, p.148602_1 - 148602_11, 2025/09
Times Cited Count：4 Percentile：64.95(Nanoscience & Nanotechnology) neutron diffraction study on the strength and ductility enhancement mechanism of hydrogen-charged SUS310S stainless steelIto, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.*; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.
Hamon, 35(3), p.129 - 133, 2025/08
Takanashi, Misa*; Hidaka, Ryota*; Okubo, Kota*; Masumura, Takuro*; Tsuchiyama, Toshihiro*; Morooka, Satoshi; Maeda, Takuya*; Nakamura, Shuichi*; Uemori, Ryuji*
ISIJ International, 65(9), p.1384 - 1393, 2025/08
Times Cited Count：1 Percentile：30.65(Metallurgy & Metallurgical Engineering)
ders band-assisted high uniform ductility in ultrastrong ferrous medium-entropy alloy via hierarchical microstructureKwon, H.*; Lee, J. H.*; Zargaran, A.*; Harjo, S.; Gong, W.; Wang, J.*; Gu, G. H.*; Lee, B.-J.*; Bae, J. W.*; Kim, H. S.*
International Journal of Plasticity, 190, p.104378_1 - 104378_18, 2025/07
Times Cited Count：11 Percentile：95.64(Engineering, Mechanical)Gu, G. H.*; Jeong, S. G.*; Heo, Y.-U.*; Harjo, S.; Gong, W.; Cho, J.*; Kim, H. S.*; 4 of others*
Journal of Materials Science & Technology, 223, p.308 - 324, 2025/07
Times Cited Count：8 Percentile：88.29(Materials Science, Multidisciplinary)Mao, W.*; Gong, W.; Kawasaki, Takuro; Gao, S.*; Ito, Tatsuya; Yamashita, Takayuki*; Harjo, S.; Zhao, L.*; Wang, Q.*
Scripta Materialia, 264, p.116726_1 - 116726_6, 2025/07
Times Cited Count：2 Percentile：51.29(Nanoscience & Nanotechnology)Park, M.-H.*; Shibata, Akinobu*; Harjo, S.; Tsuji, Nobuhiro*
Acta Materialia, 292, p.121061_1 - 121061_13, 2025/06
Times Cited Count：47 Percentile：99.53(Materials Science, Multidisciplinary)Ohashi, Tomonori*; Sakamaki, Tatsuya*; Funakoshi, Kenichi*; Steinle-Neumann, G.*; Hattori, Takanori; Yuan, L.*; Suzuki, Akio*
Journal of Mineralogical and Petrological Sciences (Internet), 120(1), p.240926a_1 - 240926a_13, 2025/06
Times Cited Count：1 Percentile：40.06(Mineralogy)We explore the structures of dry and hydrated (H
O and DO) Na
Si
O
melt at 0-6 GPa and 1000-1300 K and glasses recovered from high pressure and temperatures by in-situ neutron and X-ray diffraction. The structures of the melts at 0-10 GPa and 3000 K are also investigated by ab-initio molecular dynamics simulation. In-situ neutron experiments revealed that the D-O distance increases with compression due to the formation of -O-D-O- bridging species, which is reproduced by the molecular dynamics simulations. The pressure-induced -O-D-O- formation reflects a more rigid incorporation of hydrogen, which acts as a mechanism for the experimentally observed higher solubility of water in silicate melts. Together with shrinking modifier domains, this process dominates the compression behavior of hydrous NaSiO melt, whereas the compression of dry NaSiO at 0-10 GPa and 3000 K is governed largely by bending of the Si-O-Si angle. The molecular dynamics simulations on hydrous NaSiO melts further suggest that the sodium ions are scavenged from its network-modifying role via 2(![$$^{[4]}$$](/search/images/ERPHWWZULV4SI.gif)
Si-O
+ Na) 
Si-(O-![$$^{[5]}$$](/search/images/ERPHWWZVLV4SI.gif)
Si-O)
+ 2Na and Si-O + Na + Si-OH Si-(O-H-O-Si) + Na with increasing pressure.
