Abstract
Abstract Glass-ceramics are being investigated as possible hosts for the radioactive wastes that would result from recycling irradiated nuclear fuels. For a glass‐ceramic to be a superior waste form to a single-phase glass, some of the long-lived actinides and fission products must be preferentially incorporated into the lattice of the crystalline phase. The partitioning of lanthanum in sphene-based glass‐ceramics has been studied by scanning Auger electron microscopy for lanthanum concentrations from 0.2 to 2.0 mol.%. Sphene crystals (CaTiSiOs) were located in the silica-rich glass matrix by recording digital Auger images of the calcium and titanium distributions. The sphene crystals .were typically 0.5 to 5 μn in size and occupied approximately 40% of the total specimen volume. Auger spot analyses revealed that lanthanum was strongly partitioned (by at least a factor of 10) into the sphene phase of phosphorus-free glass-ceramics; however, when a small amount of phosphorus (0.7 mol.%) was included in the...
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