Cadmium germanium diarsenide glasses were synthesized in bulk form (B2.4 cm 3 ) using procedures adapted from the literature. Several issues involved in the fabrication and quenching of amorphous CdGe x As 2 (x 5 0.45, 0.65, 0.85, and 1.00, where x is the molar ratio of Ge to 1 mol of Cd) are described. An innovative processing route is presented to enable fabrication of high-purity, vitreous, crack-free ingots with sizes up to 10 mm diameter, and 30-40 mm long. Specimens from selected ingots were characterized using thermal analysis, optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, particle-induced X-ray emission, Rutherford backscattering, secondary ion mass spectrometry, X-ray diffraction, density, and optical spectroscopy. Variations in properties as a function of processing conditions and composition are described. Results show that the density of defect states in the middle of the band gap and near the band edges can be decreased three ways: through suitable control of the processing conditions, by doping the material with hydrogen, and by increasing the concentration of Ge in the glass.

This project has focused on the immobilization of Tc waste streams and undissolved solids (UDS) which consists mainly of the 5-metal particles (Mo-Ru-Tc-Rh-Pd). Composition of UDS will have strong impact on composition of the final waste form alloy. Idaho National Laboratory (INL) has added Re and Mo (as surrogates for Tc and UDS metals) to the SS-15Zr alloy that was previously developed for EBR-II metal wastes.Microanalysis using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) has been used to analyze a ~5 g. ingot with composition 71.3 wt% 316SS-5.3 wt% Zr-13.2 wt% Mo-4.0 wt% Rh-6.2 wt% Re prepared at the Idaho National Laboratory. Four phase fields have been identified, two of which are lamellar eutectics, with a fifth possibly present. A Zr rich phase was found distributed as fine precipitate, ~10 µm in diameter, often coating large cavities. A Mo-Fe-Re-Cr lamellar eutectic phase field appears as blocky regions ~30 µm in diameter, surrounded by a Fe-Mo-Cr lamellar eutectic phase field, and that in turn is surrounded by a Zr-Fe-Rh-Mo-Ni phase field. The eutectic phase separation reactions are different. The Mo-Fe-Re-Cr lamellar eutectic appears a result of austenitic steel forming at lower volume fraction within an Mo-Fe-Re intermetallic phase, whereas the Fe-Mo-Cr lamellar eutectic may be a result of the same intermetallic phase forming within a ferritic steel phase. Cavitation may have arisen either as a result of bubbles, or from loss of equiaxed particles during specimen preparation.v

PNNL would like to thank Dr. Wood for his guidance and technical direction throughout the course of this effort. At PNNL, the authors would like to extend their gratitude to Ms. Lori Bisping for all of her hard work in providing administrative and financial reporting support to this project. Lori's attention to detail, expertise, and efficiency are second to none. Finally, the PNNL technical team would like to extend their thanks to Ms. Kay Hass for her ongoing support and technical editing expertise in preparing and finalizing this technical letter report.

PNNL would like to thank Dr. Wood for his guidance and technical direction throughout the course of this effort. At PNNL, the authors would like to extend their gratitude to Ms. Lori Bisping for all of her hard work in providing administrative and financial reporting support to this project. Lori's attention to detail, expertise, and efficiency are second to none. Finally, the PNNL technical team would like to extend their thanks to Ms. Kay Hass for her ongoing support and technical editing expertise in preparing and finalizing this technical letter report.

PNNL would like to thank Mr. Grandy for his guidance and technical direction throughout the course of this effort. The Technical Team would also like to thank our colleagues at ANL for working jointly with PNNL staff over the course of this collaborative effort.At PNNL, the authors are indebted to Mr. Royce Mathews for providing in-Lab support across the entire spectrum of technical activities conducted on this project. The Team would also like to extend their gratitude to Ms. Lori Bisping for all of her hard work in providing administrative and financial reporting support to this project. Lori's attention to detail, expertise, and efficiency are second to none. Finally, the PNNL technical team would like to extend their thanks to Ms. Kay Hass for her ongoing support and technical editing expertise in preparing and finalizing this Technical Letter Report.