CRYSTAL STRUCTURE OF A COBALT OXIDE LuBaCo4O7
L. P. Kozeeva, M. Y. Kamaneva, A. I. Smolentsev, V. S. Danilovich, N. V. Podberezskaya
Keywords: barium lutetium cobalt oxide, ternary oxides, high-temperature crystallization, structure of cobalt oxides
Pages: 1108-1113
Abstract
Crystals of LuBaCo4O7+δ (114Lu) have been obtained by spontaneous crystallization of slowly cooled non-stoichiometric melt of the system Lu-Ba-Co-O. The crystals have been characterized by EDX microprobe and synchrotron radiation powder diffraction. Structure refinement has been carried out (automated diffractometer Bruker X8 APEX with a CCD detector, МоKα, graphite monochromator, θmax = 32.54°). Parameters of the hexagonal unit cell: space group P63mc, a = 6.2601(1) Å, c = 10.2017(3) Å, V =
346.23(1) Å3, Z = 2, dcalc = 6.331 g/cm3. Framework structure of the wurtzite type has been refined anisotropically to R-factor 0.0174. Charge balance in the compound and geometrical matching of structural fragments are discussed.
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