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Sr)(Co
Fe
)O
by Rietveld refinement and maximum entropy method analysisIto, Takanori*; Nishida, Yuki*; Tomita, Aya*; Fujie, Yoshinori*; Kitamura, Naoto*; Idemoto, Yasushi*; Osaka, Keiichi*; Hirosawa, Ichiro*; Igawa, Naoki
Solid State Communications, 149(1-2), p.41 - 44, 2009/01
Times Cited Count：36 Percentile：76.96(Physics, Condensed Matter)The crystal structure and charge density of (BaSr)(CoFe)O were investigated by the Rietveld refinement method and the maximum entropy method by using neutron and synchrotron X-ray diffraction. The crystal structure was refined by using the split atom model to cation sites with the space group, 
. The site occupancies of O1(4
) and O2(8
) sites were 0.59 and 0.87, respectively. It was found that the (Co, Fe)-O2 plane in the sample has anisotropic covalent and ionic bands, and that the (Ba, Sr)-O1 bond was ionic with a low charge density.
for solid oxide fuel cells cathode materialsIto, Takanori*; Kurumada, Masamori*; Nishida, Yuki*; Hirai, Takene*; Igawa, Naoki
no journal, ,
We have studied the change of oxygen behavior using by neutron diffractions before and after annealed (La,Sr)(Co,Fe)O (LSCF) synthesized from high or low purity raw materials. The oxygen neutron scattering length density of the high purity LSCF concentrated to the 18
site after annealing according to results of the Rietveld refinement and the maximum entropy method. On the other hand, For one of the low purity LSCF, No marked changes were seen. These results suggest that oxygen concentrate to the stable site in the high purity LSCF, on the other hand, the stability of the oxygen in low purity LSCF did not change by annealing.
