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Journal Articles

Study of oxygen ion diffusion in (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33-delta}$ through neutron diffractions at 300 and 720 K

Ito, Takanori*; Hirai, Takene*; Yamashita, Junichi*; Watanabe, Shoji*; Kawata, Etsuya*; Kitamura, Naoto*; Idemoto, Yasushi*; Igawa, Naoki

Physica B; Condensed Matter, 405(8), p.2091 - 2096, 2010/04

https://doi.org/10.1016/j.physb.2010.01.109

Times Cited Count：15 Percentile：55.02(Physics, Condensed Matter)

We analyze the mechanism of oxygen ion diffusion in (Ba $_{0.5}$ Sr $_{0.5}$ )(Co $_{0.8}$ Fe $_{0.2}$ )O $_{2.33-delta}$ by using the Rietveld refinement, the maximum entropy method (MEM) analysis, and MEM-based pattern fitting (MPF) with neutron diffractions at 300 and 720 K. We speculate that when $_{rm aniso}$ and neutron scattering density of O1(4) site with a large number of vacancies metamorphose into that with anisotropy directed toward the O1(4) and O2(8) sites at 720 K, the oxygen ions diffuse along the paths between O1(4) and O1(4), and O1(4) and O2(8).

Journal Articles

Transport of heavy hydrocarbon and its redeposition on plasma facing walls

Oya, Kaoru*; Inai, Kensuke*; Kikuhara, Yasuyuki*; Nakano, Tomohide; Kawata, Jun*; Kawazome, Hayato*; Ueda, Yoshio*; Tanabe, Tetsuo*

Journal of Plasma and Fusion Research SERIES, Vol.8, p.419 - 424, 2009/09

http://www.jspf.or.jp/JPFRS/PDF/Vol8/jpfrs2009_08-0419.pdf

Redeposition of C $_{2}$ H $_{4}$ and C $_{2}$ H $_{6}$ chemically eroded from carbon walls is simulated by EDDY code incorporated with the reflection on a hydrogenated and amorphized carbon surface. The redeposition rate for heavy hydrocarbons is drastically decreased by introduction of the reflection. The redeposition patterns on the surface are enlarged by the reflection, but it is narrower for the heavy hydrocarbons than for CH $_{4}$ . The photon emissions of C $_{2}$ from C $_{2}$ H $_{4}$ (C $_{2}$ H $_{6}$ ) decay faster than that of CH from CH $_{4}$ in high-temperature (10 eV) plasmas, which reproduces the difference of the decay of the CD and C $_{2}$ light intensities observed in the vicinity of the outer diverter plates of JT-60U. For such temperatures, the inverse photon-efficiency, which is defined as the ratio of the number of the launching hydrocarbons to the photoemission events of CH and C $_{2}$ , is in good agreement with the values observed in JT-60U experiments.