Abstract

VEGA-GLEZ, M.; CASTELLANOS ROMAN, M.A.  and  HUANOSTA-TERA, A.. Short range order in new rock salt type structures of the system Li₃NbO₄-CoO. Rev. mex. fis. [online]. 2005, vol.51, n.3, pp.299-303. ISSN 0035-001X.

Synthesis of compounds belonging to the system Li₃NbO₄-CoO has been obtained by a solid state reaction, the products are appropriately described by the formula Li(_3-3x)Co_4xNb(_1-x-₎O₄; 0 ≤ x ≤ 1. These new compounds have been studied in their diffraction features. Their electron diffraction patterns are characterized by the existence of a well defined diffuse intensity distribution in addition to sharp Bragg reflections of a rock salt type structure. This has been attributed to the presence of atomic short range order in the structure. As the amount of Co²+ ions increases in the structure, the amount of grains which produces diffuse scattering becomes larger therefore, we propose that the presence of Co²⁺ drives local spatial cation distribution which would rise electron diffuse scattering. An explanation, in terms of a modulated structure, has been put in advance depicting a probable atomic arrangement to explain the detected short range order.

Keywords : Electron diffraction; diffuse scattering; short range order; lithium cobalt niobium oxides.

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