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Journal Articles

Hydrogenation of $$L$$1$$_{2}$$-type AlNi$$_{3}$$ alloy at high pressure and temperature

Endo, 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:100(Chemistry, Physical)

Journal Articles

Hydrogenation of a TiFe-based alloy at high pressures and temperatures

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:10 Percentile:63.58(Chemistry, Physical)

Journal Articles

Site occupancy of interstitial deuterium atoms in face-centred cubic iron

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:28 Percentile:17.88(Multidisciplinary Sciences)

Iron hydride FeH$$_x$$, 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$$_x$$. 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.

Journal Articles

Li$$_{4}$$FeH$$_{6}$$; Iron-containing complex hydride with high gravimetric hydrogen density

Saito, 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:15 Percentile:35.4(Nanoscience & Nanotechnology)

Journal Articles

Researches on Ti-alloy hydrides under high pressure and high temperature with the aid of in-situ synchrotron radiation X-ray diffraction measurements

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori

Materia, 53(3), p.94 - 99, 2014/03

no abstracts in English

Journal Articles

Synthesis and formation process of Al$$_{2}$$CuH$$_{x}$$; A New class of interstitial aluminum-based alloy hydride

Saito, 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:10 Percentile:51.12(Nanoscience & Nanotechnology)

Journal Articles

Formation of BCC TiFe hydride under high hydrogen pressure

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori

International Journal of Hydrogen Energy, 38(16), p.6726 - 6729, 2013/05

 Times Cited Count:9 Percentile:70.52(Chemistry, Physical)

Journal Articles

Magnetic properties of single crystalline YbFe$$_{2}$$O$$_{4}$$

Yoshii, 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:12 Percentile:2.24

We have investigated a single crystal of multiferroic YbFe$$_{2}$$O$$_{4}$$. 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.

Journal Articles

Formation process of perovskite-type hydride LiNiH$$_{3}$$; ${it In situ}$ synchrotron radiation X-ray diffraction study

Sato, 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:19 Percentile:29.93(Physics, Applied)

Journal Articles

Density-functional study of perovskite-type hydride LiNiH$$_{3}$$ and its synthesis; Mechanism for formation of metallic perovskite

Takagi, 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:8 Percentile:56.09(Materials Science, Multidisciplinary)

Journal Articles

Phase diagram and equation of state of TiH$$_{2}$$ at high pressures and high temperatures

Endo, 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:55.73(Chemistry, Physical)

Oral presentation

Phase relationship and equation of state of TiH$$_{2}$$ at high pressures and high temperatures

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi

no journal, , 

The phase diagram and the equation of state of TiH$$_{2}$$ at high pressure and high temperature (HPHT) were carefully investigated in the present study using by using an ${it in-situ}$ synchrotron X-ray diffraction measurement for new titanium alloys hydrides development. Summary of the study is as follows: At ambient conditions, the TiH$$_{2}$$ had a face-centered cubic crystal structure (FCC). At high pressure, TiH$$_{2}$$ crystallized in a FCC structure above 200$$^{circ}$$C. In lower temperature range, the TiH$$_{2}$$ structure was not only a FCC structure but also a tetragonal structure. Since the transformation temperature of TiH$$_{2}$$ was increased with increasing pressures, the thermal stability of this phase was increased by pressures. In this presentation, we will report detailed results together with the phase diagram and the equation of TiH$$_{2}$$ state at HPHT.

Oral presentation

Determination of phase diagram of TiH$$_{2}$$ at high pressures and high tempretures by ${it in-situ}$ synchrotron X-ray diffraction measurement

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi

no journal, , 

In this present study, we investigated the phase diagram TiH$$_{2}$$ at high pressures and high temperatures was carefully investigated by means of ${it in-situ}$ synchrotron X-ray diffraction measurement for new titanium alloys hydrides development.

Oral presentation

Phase relationship of TiH$$_{2}$$ at high pressures and high temperatures

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi

no journal, , 

no abstracts in English

Oral presentation

Angle dispersive X-ray diffraction measurements for synthetic studies using multi-anvil press

Saito, Hiroyuki; Endo, Naruki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi

no journal, , 

Oral presentation

Hydrogenation of aluminum-based alloys under high pressure

Saito, Hiroyuki; Endo, Naruki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi

no journal, , 

Oral presentation

Hydrogenation of a TiFe alloy at high pressure and high temperature

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori

no journal, , 

no abstracts in English

Oral presentation

Determination of a phase diagram of TiH$$_{2}$$ at high pressures and high temperatures for development of novel Ti-based hydrides

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori; Aoki, Katsutoshi

no journal, , 

Oral presentation

${it In situ}$ observation of hydrogenation of a CsCl-type TiFe alloy at high pressure and high temperature

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori

no journal, , 

Oral presentation

Hydrogenation of a TiFe alloy at high pressure and high temperature

Endo, Naruki; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori

no journal, , 

no abstracts in English

39 (Records 1-20 displayed on this page)