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Journal Articles

Investigation of the electronic structure of the Mg$$_{99.2}$$Zn$$_{0.2}$$Y$$_{0.6}$$ alloy using X-ray photoelectron spectroscopy

Miyazaki, Hidetoshi*; Akatsuka, Tatsuyoshi*; Kimura, Koji*; Egusa, Daisuke*; Sato, Yohei*; Itakura, Mitsuhiro; Takagi, Yasumasa*; Yasui, Akira*; Ozawa, Kenichi*; Mase, Kazuhiko*; et al.

Materials Transactions, 64(6), p.1194 - 1198, 2023/06

https://doi.org/10.2320/matertrans.MT-MD2022019
 Times Cited Count：1 Percentile：48.82(Materials Science, Multidisciplinary)

We investigated the electronic structure of the Mg$$_{99.2}$$Zn$$_{0.2}$$Y$$_{0.6}$$ alloy using hard and soft X-ray photoemission spectroscopy and electronic band structure calculations to understand the mechanism of the phase stability of this material. Electronic structure of the Mg$$_{99.2}$$Zn$$_{0.2}$$Y$$_{0.6}$$ alloy showed a semi-metallic electronic structure with a pseudo-gap at the Fermi level. The observed electronic structure of the Mg$$_{99.2}$$Zn$$_{0.2}$$Y$$_{0.6}$$ alloy suggests that the presence of a pseudogap structure is responsible for phase stability.

Journal Articles

STEM-EELS/EDS chemical analysis of solute clusters in a dilute mille-feuille-type Mg-Zn-Y alloy

Sato, Yohei*; Egusa, Daisuke*; Miyazaki, Hidetoshi*; Kimura, Koji*; Itakura, Mitsuhiro; Terauchi, Masami*; Abe, Eiji*

Materials Transactions, 64(5), p.950 - 954, 2023/05

https://doi.org/10.2320/matertrans.MT-MD2022023
 Times Cited Count：1 Percentile：48.82(Materials Science, Multidisciplinary)

Dilute Mg-Zn-Y alloy with a mille-feuille structure (MFS) exhibits a mechanical strength comparable to Mg-Zn-Y alloy with long period stacking/ordered (LPSO) structure through kink deformation. In order to deepen understanding the thermal stability of the MFS-type Mg alloys, it is required to clarify the solute cluster structures composed of Zn and Y in solute enriched stacking faults (SESFs). In this study, electron energy-loss and energy dispersive X-ray spectroscopy based on scanning transmission electron microscopy (STEM-EELS/EDS) were conducted to investigate the electronic structure and composition of Zn and Y in the SESFs of the MFS-Mg alloy. Zn-L2,3 spectra indicated that the valence charges of Zn in the dilute Mg alloy were different from that of the LPSO-type Mg-Zn-Y alloy. In addition, the intensity ratio of L3/L2 in Y-L2,3 spectrum of the dilute MFS-Mg alloy was larger than that of the LPSO-Mg alloy, reflecting the electron occupancies of 4d3/2 and 4d5/2 orbitals of Y atoms were different from those of the LPSO-Mg alloys. STEM-EELS analysis of the SESF composition in the dilute MFS-Mg alloy indicated that the Zn/Y ratio should be lower than that of the LPSO-Mg alloy, which was confirmed also by STEM-EDS measurements. These results indicate that the cluster structure in the SESFs of the dilute MFS-Mg alloy should be different from the ideal Zn6Y8 cluster in the LPSO-type Mg-Zn-Y alloys.

Journal Articles

Impurity effects in the microscopic elastic properties of polycrystalline Mg-Zn-Y alloys with a synchronised long-period stacking ordered phase

Hosokawa, Shinya*; Kimura, Koji*; Yamasaki, Michiaki*; Kawamura, Yoshihito*; Yoshida, Koji*; Inui, Masanori*; Tsutsui, Satoshi*; Baron, A. Q. R.*; Kawakita, Yukinobu; Ito, Shinichi*

Journal of Alloys and Compounds, 695, p.426 - 432, 2017/02

https://doi.org/10.1016/j.jallcom.2016.10.266
 Times Cited Count：3 Percentile：16.49(Chemistry, Physical)

Journal Articles

Structural aspects of the superionic conduction mechanism in Ag-GeSe$$_{3}$$ glasses

Stellhorn, J. R.*; Hosokawa, Shinya*; Pilgrim, W.-C.*; Kawakita, Yukinobu; Kamimura, Kenji*; Kimura, Koji*; Blanc, N.*; Boudet, N.*

Zeitschrift f$"u$r Physikalische Chemie, 230(3), p.369 - 386, 2016/03

https://doi.org/10.1515/zpch-2015-0667
 Times Cited Count：4 Percentile：9.24(Chemistry, Physical)

Journal Articles

Standard Gibbs free energies for transfer of actinyl ions at the aqueous/organic solution interface

Kitatsuji, Yoshihiro; Okugaki, Tomohiko*; Kasuno, Megumi*; Kubota, Hiroki*; Maeda, Koji*; Kimura, Takaumi; Yoshida, Zenko; Kihara, Sorin*

Journal of Chemical Thermodynamics, 43(6), p.844 - 851, 2011/06

https://doi.org/10.1016/j.jct.2010.12.023
 Times Cited Count：8 Percentile：30.19(Thermodynamics)

Standard Gibbs energies for transfer ($$Delta$$G$$_{tr}$$$$^{0}$$) of actinyl ions (AnO$$_{2}$$$$^{z+}$$; z = 2 or 1; An: U, Np or Pu) between an aqueous solution and an organic solution were determined based on distribution method combined with voltammetry for ion transfer at the interface of two immiscible electrolyte solutions. The organic solutions examined were nitrobenzene, 1,2-dichloroethane, benzonitrile, acetophenone and 2-nitrophenyl octyl ether. Irrespective of the type of organic solutions, $$Delta$$G$$_{tr}$$$$^{0}$$ of UO$$_{2}$$$$^{2+}$$, NpO$$_{2}$$$$^{2+}$$ and PuO$$_{2}$$$$^{2+}$$ were nearly equal to each other and slightly larger than that of Mg$$^{2+}$$. The $$Delta$$G$$_{tr}$$$$^{0}$$ of NpO$$_{2}$$$$^{+}$$ was extraordinary large compared with those of ordinary monovalent cations. The dependence of $$Delta$$G$$_{tr}$$$$^{0}$$ of AnO$$_{2}$$$$^{z+}$$ on the type of organic solutions was similar to that of H$$^{+}$$ or Mg$$^{2+}$$. The $$Delta$$G$$_{tr}$$$$^{0}$$ of An$$^{3+}$$ and An$$^{4+}$$ were also discussed briefly.

Journal Articles

Magnetic-field-induced polarization flop in multiferroic TmMn$$_{2}$$O$$_{5}$$

Fukunaga, Mamoru*; Sakamoto, Yuma*; Kimura, Hiroyuki*; Noda, Yukio*; Abe, Nobuyuki*; Taniguchi, Koji*; Arima, Takahisa*; Wakimoto, Shuichi; Takeda, Masayasu; Kakurai, Kazuhisa; et al.

Physical Review Letters, 103(7), p.077204_1 - 077204_4, 2009/08

https://doi.org/10.1103/PhysRevLett.103.077204
 Times Cited Count：50 Percentile：86.01(Physics, Multidisciplinary)

Oral presentation

Separation of actinide ion based on electrolytic extraction by flow electrolysis cell for rapid ion transfer

Kitatsuji, Yoshihiro; Okugaki, Tomohiko*; Kasuno, Megumi*; Maeda, Koji*; Kimura, Takaumi; Yoshida, Zenko; Kihara, Sorin*

no journal, , 

no abstracts in English

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