La espectroscopia Mlissbauer del 57Fe ha sido utilizada para investigar el proceso de transformaciones de las unidades de Te(Fe)-0 por la acción del óxido modificador LhO. Nuestros experimentos en el sistema vítreo Fe: LhO-Ti02-TeOz mostraron que para concentraciones menores que 0.19 Mol de U20 las bi-pirámides se transforman en pirámides debido a la acción del óxido modificador U20, mientras que para concentraciones mayores que 0.19 Mol el ión de Fe3 a diferencia del Te4+, tiende a atraer oxígenos extras llevando así a un aumento de las unidades bi-piramidales. @ 2002 CSI. Todos los derechos reservados

We report the study on the synthesis of indium-doped cobalt ludwigite (Co2InBO5). The Match program, applied to the XRD powder standard, determined that the compound consists of two phases: phase I, ludwigite Co2InBO5 and phase II, the indium oxide In2O3 impurity. The Rietveld refinement applied to the XRD powder standard determined that the percentage by weight of phase I was 98.18% and the percentage by weight of phase II was 1.82%. The atomic ratio between Co and in corresponded to Co/In=2/1, for a goodness of fit s = 1.64 and Chi2 ≅ 2.70. With these adjustment values, the chemical content of the experimental compound was adjusted to its theoretical chemical stoichiometric content. In the unit cell, the different types of atoms occupied the Wyckoff positions 2b, 2c, 4g, and 4h. Atoms of the same or different types can occupy the same Wyckoff position, but a group of them occupy equi...