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  1. No Access

    Article

    Raman spectroscopic study of the structure of BaO-YO1.5-SiO2 and BaO-LaO1.5-SiO2 glasses

    Hiromitsu Kozuka, Yulin Li, Kohei Fukumi… in Journal of Materials Science Letters (1987)

  2. No Access

    Article

    Raman spectroscopic study on the 631-1631-1631-1glasses containing >50mol% RO (R = Ca, Sr and Ba)

    Kohei Fukumi, Sumio Sakka in Journal of Materials Science Letters (1988)

  3. No Access

    Article

    Coordination state of Nb5+ ions in silicate and gallate glasses as studied by Raman spectroscopy

    Raman spectra of K2O-Nb2O5-SiO2 glasses are measured in order to compare the coordination state of Nb5+ ions in gallate glasses with that in silicate glasses. It is found that less-distorted NbO6 octahedra with n...

    Kohei Fukumi, Sumio Sakka in Journal of Materials Science (1988)

  4. No Access

    Article

    Properties of Cs2O-Nb2O5-Ga2O3 glasses

    Kohei Fukumi, Sumio Sakka in Journal of Materials Science Letters (1989)

  5. No Access

    Article

    Structure of Au ultrafine particles in silica glass by x-ray absorption fine structure spectroscopy

    The structure of ultrafine gold particles embedded in silica glass by ion implantation has been studied by x-ray absorption fine structure spectroscopy. It is found that the Au–Au interatomic distance in the p...

    Kohei Fukumi, Hiroyuki Kageyama, Kohei Kadono… in Journal of Materials Research (1995)

  6. No Access

    Article

    Structural Relaxation of Densified Silica Glass by Thermal Annealing

    Thermal relaxation of glass structure has been studied on silica glasses densified by hot isostatic pressing. Density of the glasses relaxed toward the value of an undensified glass by thermal annealing. Relax...

    Naoyuki Kitamura, Kohei Fukumi, Masaki Makihara… in MRS Online Proceedings Library (1995)

  7. No Access

    Article

    Extended x-ray absorption fine structure study on amorphous Nd–Fe–B alloys

    The local structure and crystallization behavior of Nd15Fe77Bxx = 2−14) melt-spun alloys were studied by Nd L3 extended x-ray absorption fine structure (EXAFS). The conventional x-ray powder diffractometry studie...

    Hiroyuki Kageyama, Kohei Kadono, Kohei Fukumi… in Journal of Materials Research (1998)

  8. No Access

    Article

    X-ray Absorption Fine Structure Study on Coordination State of Implanted Gold Ions in Silica Glass

    Coordination state of gold atoms implanted in silica glass to an energy of 1.5 MeV and a dose of 1 × 1017 ions/cm2 has been studied by x-ray absorption fine structure spectroscopy. It was found that most of the g...

    Kohei Fukumi, Hiroyuki Kageyama, Kohei Kadono… in Journal of Materials Research (1998)

  9. No Access

    Article

    Coordination structures of implanted Fe, Co, and Ni ions in silica glass by x-ray absorption fine structure spectroscopy

    Coordination structures of implanted Fe, Co, and Ni ions were studied in 1.78–2.00-MeV 5 × 1016 ions/cm2-implanted silica glasses by x-ray absorption and optical absorption spectroscopies. It was found from x-ray...

    Kohei Fukumi, Akiyoshi Chayahara, Kohei Kadono… in Journal of Materials Research (2001)

  10. No Access

    Article

    X-ray absorption fine structure study on the formation of Cu–Br bonds in (Br + Cu) ion implanted silica glass

    The valence and coordination structure of implanted Cu and Br ions were investigated by x-ray absorption fine structure spectroscopy in (2.4 MeV 6 × 1016 Br2+ ions cm−2+ 2 MeV 6 × 1016 Cu+ ions cm−2)-implanted si...

    Kohei Fukumi, Akiyoshi Chayahara, Atsushi Kinomura… in Journal of Materials Research (2003)

  11. No Access

    Article

    Structure of Cu Ions in (Cu + Halogen or Chalcogen)-Ion Implanted Silica Glasses

    Structure of Cu ions in (Cl+Cu)-, (Br+Cu)-, (I+Cu)-, (S+Cu)- and (Se+Cu)-ion implanted silica glasses has been studied by x-ray absorption and optical absorption spectroscopies. Cu ions formed Cu-O bonds in th...

    Kohei Fukumi, Akiyoshi Chayahara, Hiroyuki Kageyama… in MRS Online Proceedings Library (2003)

  12. No Access

    Article

    Coordination structure of implanted manganese ions in silica glass

    180 keV Mn+ ions were implanted in silica glass at doses ranging from 1×1016 to 2×1017 ions/cm2 at room temperature. The coordination structure of implanted Mn atoms was studied by X-ray absorption spectroscopy. ...

    Kohei Fukumi, Akiyoshi Chayhara, Hiroyuki Kageyama… in MRS Online Proceedings Library (2011)