Structural Response to the Saturation of Hexagonal Cobaltate YBaCo4O7 + x Crystals with Oxygen
V. YU. KOMAROV1,2, N. V. PODBEREZSKAYA1, M. YU. KAMENEVA1, L. P. KOZEEVA1, A. N. LAVROV1
1Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Pr. Akademika Lavrentyeva 3, Novosibirsk 630090 (Russia)
2Novosibirsk State University, Ul. Pirogova 2, Novosibirsk 630090 (Russia)
Keywords: кислородный обмен, кобальтаты, четырехъядерные кобальт-кислородные фрагменты, слоистые структуры, oxygen exchange, cobaltates, tetranuclear cobalt-oxygen fragments, layered structures
Abstract
Relying on the analysis of experimental data on the structural changes in hexagonal cobaltate YBaCo4O7 under saturation with oxygen up to the composition of YBaCo4O8 and YBaCo4O8.4, significant atomic groups in Co sublattice were marked out for generalized description of the existing distortions. The sequence of structural transformations accompanying oxygen insertion is clearly presented; the maximal saturation degree that is possible within the framework of this model is estimated.
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