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short communications
The crystal structure of a cubic 
perovskite-type doped lanthanum cobaltite, La0.6Sr0.4CoO3-![[delta]](/logos/entities/delta_rmgif.gif)
, has been studied using in situ neutron powder diffraction data measured at 1531 K. The refined occupancy 0.886 (6) of O atoms at the 3d 1/2, 0, 0 site indicated an oxygen deficiency of = 0.34 (2) and an average valence of +2.7 for Co cations in La0.6Sr0.4CoO3- at 1531 K. Refined anisotropic atomic displacement parameters and nuclear density mapping reveal that the oxygen ions in La0.6Sr0.4CoO3- exhibit a large thermal motion perpendicular to the Co-O bond. A curved path for oxygen-ion migration between adjacent anion sites in La0.6Sr0.4CoO3- is proposed, although it was not observed as a connected density in the experimental mapping.
perovskite-type doped lanthanum cobaltite, La0.6Sr0.4CoO3-, has been studied using in situ neutron powder diffraction data measured at 1531 K. The refined occupancy 0.886 (6) of O atoms at the 3d 1/2, 0, 0 site indicated an oxygen deficiency of = 0.34 (2) and an average valence of +2.7 for Co cations in La0.6Sr0.4CoO3- at 1531 K. Refined anisotropic atomic displacement parameters and nuclear density mapping reveal that the oxygen ions in La0.6Sr0.4CoO3- exhibit a large thermal motion perpendicular to the Co-O bond. A curved path for oxygen-ion migration between adjacent anion sites in La0.6Sr0.4CoO3- is proposed, although it was not observed as a connected density in the experimental mapping.
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