Purification of Metal Fluorides for the Ultra Low Loss Program
NAVAL RESEARCH LAB WASHINGTON DC
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By using radiotracer techniques the practical limits for the preparation of high purity ZrF4, HfF4, and LaF3 via NRL current technology have been determined. The required concentration of impurities in BaF2, AiF3, and NaF for a 0.01 dBkm loss are calculated assuming the ZrF4, HfF4, and LaF3 purification technique are optimized to produce the impurity concentrations determined via radiotracer experiments. The significance of this work to the Ultra-Low Program is 1 The radiotracer study has shown that current NRL technology is capable of producing ZrF4, HfF4, and LaF4, and LaF3 which contain low to sub-ppb concentrations of transition and rare earth element impurities. 2 The calculated impurity concentrations for BaF2, AlF3, and NaF define a realistic goal for new purification techniques. 3 The required impurity levels in BaF2, AlF3, and NaF are achievable via current technology. Radiotracer results indicate sub-ppb concentrations of impurities are achievable in ZrF4, HfF4, and LaF3, therefore, such levels should be possible in BaF2, AlF3, and NaF. This will be addressed in a future paper.
- Metallurgy and Metallography