Abstract
The crystal structure of Co3Al2Si3O12 granet grown by the hydrothermal method has been refined by the least squares method using 635 reflections measured on an automatic single crystal diffractometer. The unweighted R factors is 0.037 for 469 unrejected reflections, of which 259 are non-equivalent. The cell dimensions are: a0=11.455 A, and V=1503.07A3; space group Ia3d. The Si-O distance is 1.627(2)A. Comparison of a new crystal structure refinement for Co3A12Si3O12 garnet with published refinements for some alumino silicate garnets indicates that the Si-O bond lengths correlate with electronegativity of non-tetrahedral cations as two separate trends. One is pyropegrossular series and the other is Co3Al2Si3O12 garnet-almandine-spessartine series. In the former their dodecahedral sites are mainly occupied by M2+cations which have empty 3d orbitals, whereas in the latter the dodecahedral sites are mainly or partially occupied by M2+ cations which have no empty 3d orbitals.
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