Measurements are made of the visible spectra of pure CoCl2, CoBr2 polycrystalline layers, and CoCl26H2O and CoBr26H2O monocrystals between 77 and 1050 °K. A good degree of correspondence is established between the spectral components of polycrystalline CoCl2 and CoBr2. The spectra of the two hydrates also show similarities which lead to the conclusion that the first coordination sphere around Co++ at 77 °K has an octahedral‐type symmetry with two halide ions and four water molecules.
Modification of the CoCl2 and CoBr2 spectra when passing from the solid to liquid phase (melt) is also investigated. This indicates a transformation from octahedral to tetrahedral symmetry.
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