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Katayama, Yoshinori
no journal, ,
Recent development of strong synchrotron radiation sources enables us to study pressure-induced structural changes in liquids and lasses. Our studies using a large-volume press installed in JAEA beamline BL14B1 in the SPring-8 revealed that the structural changes in liquids and glasses are not monotonous and transformation sometimes occurs sharper than previously thought. Studies on a liquid-liquid transition in phosphorus and a pressure-induced structural change in liquid water will be reviewed.
Ito, Takanori*; Yokote, Takenori*; Kitamura, Naoto*; Idemoto, Yasushi*; Sakuma, Takashi*; Takahashi, Haruyuki*; Igawa, Naoki
no journal, ,
The investigation and development of the cathode materials are one of the major subjects to decrease the operation temperature for solid oxide fuel cell. In this study, we measured the neutron and synchrotron X-ray diffraction of La
Sr
MnO
and (Ba
Sr)(Co
Fe
)O
. We discuss the mechanism of the electron-oxide ion mixed conduction from the Rietveld and the maximum entropy method analyses.
Ito, Takanori*; Yokote, Takenori*; Kitamura, Naoto*; Idemoto, Yasushi*; Sakuma, Takashi*; Takahashi, Haruyuki*; Igawa, Naoki
no journal, ,
Perovskite-type oxides with electron-oxide ion mixed conduction are attractive materials as a cathode for solid oxide fuel cell. Although (La,Sr)MnO is applied for this purpose, (Ba,Sr)(Co,Fe)O has much attention because it has lower operation temperature. In this study, we carried out the neutron and synchrotron X-ray diffraction study on those materials, and discuss the difference in crystal structure including the nuclei and electron distribution on the transition metal-oxygen plain in the crystal from the results of the Rietveld and the maximum entropy method analyses.