Abstract
High quality equiaxed magnetite (Fe 3O 4) crystals, up to 2 cm in extension, have been grown in a skull melter in an atmosphere of CO 2 by slow lowering of the crucible out of the stationary work coil. X-ray powder diffraction and back reflection Laue photography indicate magnetite crystals, reflected polarized light microscopy of the boules reveals wüstite (Fe 1−x O) intergrowths restricted to a few microns of the grain boundaries and a thin layer (about 100 microns) of a hematite (Fe 2O 3) on the top of the boule. A comparison is made between results for skull crucibles of different sizes.
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