Abstract
It is well known that single crystals of iron-free olivine have numerous applications in geological studies as well as in ESR and infra-red spectroscopy. Previously, clear and stoichiometric single crystals of centimeter size have been grown only by Bridgman or flame-fusion technique with all the incoveniences of the methods.We report growth using fluxes such as PbOV2O5, MoO3Li2O, WO3Li2O. The solubility has been increased with fluxes containing MoO3, Li2O5 and larger crystals have grown. Centimeter-size single crystals of forsterite with uniform composition were obtained after slow-cooling. The morphology of these compounds was the same as native olivines.Impurity concentration was measured by microprobe and optical emission spectrometry. Molybdenum was found only in inclusions. Some crystals doped with Gd3+ and Fe3+ were also studied by ESR techniques to locate the doping ions in the lattice.Inclusions were completely eliminated by heating crystals in a hydrogen atmosphere.
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