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Machida, Akihiko*; Saito, Hiroyuki*; Sugimoto, Hidehiko*; Hattori, Takanori; Sano, Asami; Endo, Naruki*; Katayama, Yoshinori*; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.
Nature Communications (Internet), 15, p.8861_1 - 8861_2, 2024/10
Times Cited Count：0 Percentile：0.00(Multidisciplinary Sciences)In our previous article (Nature Commun. 5, 5063 (2014)), the site occupancies of D atoms dissolved in an fcc Fe metal lattice were investigated via Rietveld refinement of neutron powder diffraction patterns collected at 988 K and 6.3 GPa. The fcc metal lattice has two interstitial sites available for accommodating D atoms: octahedral and tetrahedral sites. The Rietveld refinement revealed that D atoms occupied mainly the octahedral sites with occupancy of 0.532 and slightly the tetrahedral sites with occupancy of 0.056. Subsequent density-functional-theory (DFT) calculations by Antonov (Phys. Rev. Mater. 2019)) showed that the occupation energy on the tetrahedral site was significantly higher than that on the octahedral site; the tetrahedral site occupation was unlikely to occur even at temperatures as high as 988 K. We reexamined the site occupancies of D-atom by Rietveld refinement including extinction correction. As a result, the octahedral occupancy was increased to 0.60 and the tetrahedral occupancy was reduced to zero. The occupation of only the octahedral site for D atom is consistent with the DFT calculation, although in contrast to the previous results.
1
-type AlNi
alloy at high pressure and temperatureEndo, Naruki*; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
Journal of Alloys and Compounds, 645(Suppl.1), p.S61 - S63, 2015/10
Times Cited Count：0 Percentile：0.00(Chemistry, Physical)Endo, Naruki*; Saita, Itoko*; Nakamura, Yumiko*; Saito, Hiroyuki; Machida, Akihiko
International Journal of Hydrogen Energy, 40(8), p.3283 - 3287, 2015/03
Times Cited Count：17 Percentile：37.45(Chemistry, Physical)Machida, Akihiko; Saito, Hiroyuki; Sugimoto, Hidehiko*; Hattori, Takanori; Sano, Asami; Endo, Naruki*; Katayama, Yoshinori; Iizuka, Riko*; Sato, Toyoto*; Matsuo, Motoaki*; et al.
Nature Communications (Internet), 5, p.5063_1 - 5063_6, 2014/09
Times Cited Count：73 Percentile：87.71(Multidisciplinary Sciences)Iron hydride FeH
, is thermodynamically stable only at high hydrogen pressure of several GPa. To investigate the hydrogenation process and hydrogen state in iron hydride, it is necessary to carry out the in-situ measurement under high pressure and high temperature. In this study, we performed the in-situ neutron diffraction measurement of Fe-D system using the high pressure neutron diffractometer PLANET in the MLF, J-PARC, and determined the deuterium occupying sites and occupancies in fcc-FeD. We found the minor occupation of tetrahedral sites under high pressure and high temperature. We considered the mechanism of the minor occupation based on the Quantum-mechanical calculation.
FeH
; Iron-containing complex hydride with high gravimetric hydrogen densitySaito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki*; Aoki, Katsutoshi*; Orimo, Shinichi*
APL Materials (Internet), 2(7), p.076103_1 - 076103_7, 2014/07
Times Cited Count：25 Percentile：66.86(Nanoscience & Nanotechnology)Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
Materia, 53(3), p.94 - 99, 2014/03
no abstracts in English
CuH
; A New class of interstitial aluminum-based alloy hydrideSaito, Hiroyuki; Takagi, Shigeyuki*; Endo, Naruki; Machida, Akihiko; Aoki, Katsutoshi; Orimo, Shinichi*; Katayama, Yoshinori
APL Materials (Internet), 1(3), p.032113_1 - 032113_7, 2013/09
Times Cited Count：16 Percentile：53.04(Nanoscience & Nanotechnology)Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
International Journal of Hydrogen Energy, 38(16), p.6726 - 6729, 2013/05
Times Cited Count：35 Percentile：62.19(Chemistry, Physical)OYoshii, Kenji; Mizumaki, Masaichiro*; Matsumoto, Keisuke*; Mori, Shigeo*; Endo, Naruki; Saito, Hiroyuki; Matsumura, Daiju; Kambe, Takashi*; Ikeda, Naoshi*
Journal of Physics; Conference Series, 428, p.012032_1 - 012032_5, 2013/04
Times Cited Count：15 Percentile：96.65(Chemistry, Applied)We have investigated a single crystal of multiferroic YbFeO. Its magnetic transition temperature was 250 K. The magnetization along the c-axis was much larger than that within the ab plane, indicating the Ising character of this system. The field-cooled magnetization became negative below 10 K. This was explained in terms of an antiparallel coupling between Yb and Fe moments. Magnetocaloric effects were also observed. The change of entropy was found to show a broad peak with a width of 100 K, which is favorable to application.
; 
synchrotron radiation X-ray diffraction studySato, Ryutaro*; Saito, Hiroyuki; Endo, Naruki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Aoki, Katsutoshi; Orimo, Shinichi*
Applied Physics Letters, 102(9), p.091901_1 - 091901_4, 2013/03
Times Cited Count：46 Percentile：82.40(Physics, Applied) and its synthesis; Mechanism for formation of metallic perovskiteTakagi, Shigeyuki*; Saito, Hiroyuki; Endo, Naruki; Sato, Ryutaro*; Ikeshoji, Tamio*; Matsuo, Motoaki*; Miwa, Kazutoshi*; Aoki, Katsutoshi; Orimo, Shinichi*
Physical Review B, 87(12), p.125134_1 - 125134_6, 2013/03
Times Cited Count：33 Percentile：73.42(Materials Science, Multidisciplinary) at high pressures and high temperaturesEndo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi
Journal of Alloys and Compounds, 546, p.270 - 274, 2013/01
Times Cited Count：6 Percentile：32.80(Chemistry, Physical)
( = Fe, Co, Ni) alloys at high pressure and temperatureEndo, Naruki; Ishikawa, Kazuhiro*; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
no journal, ,
no abstracts in English
FeH at high pressures and high temperaturesSaito, Hiroyuki; Takagi, Shigeyuki*; Matsuo, Motoaki*; Iijima, Yuki*; Endo, Naruki; Aoki, Katsutoshi; Orimo, Shinichi*
no journal, ,
no abstracts in English
CuHSaito, Hiroyuki; Takagi, Shigeyuki*; Endo, Naruki*; Machida, Akihiko; Aoki, Katsutoshi; Orimo, Shinichi*; Katayama, Yoshinori
no journal, ,
Saito, Hiroyuki; Endo, Naruki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi
no journal, ,
Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
no journal, ,
no abstracts in English
at high pressures and high temperatures for development of novel Ti-based hydridesEndo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi
no journal, ,
O (R: rare earths)Yoshii, Kenji; Matsumura, Daiju; Endo, Naruki; Saito, Hiroyuki; Yoneda, Yasuhiro; Nishihata, Yasuo; Funae, Takeshi*; Ejiri, Hiroki*; Kano, Jun*; Kobayashi, Tatsuo*; et al.
no journal, ,
We have investigated the substitution effects at the rare-earth (R) site in multiferroic RFeO (R: Y, Ho-Lu) to explore a new phase of this system. From EXAFS measurements for the R atoms, the large R
ions (such as Dy) was partially substituted in RFeO. Powder X-ray diffraction showed that this material had a single-phase RFeO-type structure (space group R-3m). The simulated EXAFS spectrum reproduced the characteristics of the experimental spectrum, confirming that R is actually settled at the rare earth site. The other results, such as the magnetic properties, will be reported at the conference.
Endo, Naruki; Matsumoto, Itoko*; Nakamura, Yumiko*; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori
no journal, ,
