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Fluorapatite, fluorinated calcium phosphate, has been identified as a potential matrix for the entombment of the zirconium fluoride fission product waste stream from the proposed FLEX process. If the efficacy of fluorapatite-based waste-storage can be demonstrated, then new and potentially more-efficient options for handling and separating high-level wastes, based on fluoride-salt extraction, will become feasible. This proposal will develop a dual-path research project to develop a process to fabricate a synthetic fluorapatite waste form for the ZrF4, FP waste stream, characterize the waste form, examine its performance under environmental conditions, and correlate the behavior of the waste form with natural analogs. Characterization of the material will be accomplished through probing the molecular-scale electronic and geometric structure of the materials in order to relate them to macroscopic properties, with the goal of developing techniques to evaluate and predict the performance of different waste-form materials. Time and funding permitting, other waste forms for the zirconium fluoride, fission product salt waste stream will be examined and benchmarked against the fluorapatite matrix baseline.

Highlights of Accomplishments:

1. Synthezised Sr containing hydroxyapatite using the reflux method and acquired SEM, EDS and XPS data for these samples.

2. More samples of Sr containing hydroxyapatite synthezised using various lengths of refluxing time and stirring to check the thermodynamic effects on the crystalline character/shape of the samples.

3. First samples of fluorapatite and Sr-containing fluorapatite synthesized and analyzed with IR spectroscopy.

4. Synthesized Zn containing hydroxyapatite using the reflux method and obtained IR data.


Calcium phosphate; Fluorides; Fluorination; Hydroxyapatite; Phosphate minerals; Radioactive wastes — Storage; Separation (Technology); Strontium; Zinc; Zirconium compounds

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Radioactive wastes--Storage; Separation (Technology); Zirconium compounds


Chemistry | Oil, Gas, and Energy | Physical Chemistry

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303 KB




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