X-ray Spectroscopic Study of the Electronic Structure of Monazite- and Xenotime-Type Rare-Earth Phosphates
Why this work is in the frame
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Bibliographic record
Abstract
Crystalline solid-state oxides that exhibit resistance to radiation-induced structural damage are being considered as materials for the immobilization of waste actinide elements. In this regard, compounds adopting the monazite (REPO 4; RE = La to Gd) or xenotime (RE′PO 4; RE′ = Tb to Lu and Y) structures are being investigated for this application. Both of these structures coexist in natural samples which leads to the formation of solid solutions. In this study, multiple series of solid solutions (La 1– x Yb x PO 4, La 1– x Y x PO 4, and Sm 1– x Ho x PO 4 ) were synthesized and investigated by powder X-ray diffraction, X-ray absorption near-edge spectroscopy (XANES), and X-ray photoelectron spectroscopy (XPS). XANES and XPS were performed to examine the influence of crystal structure on spectra. Examination of P K- and P L 2,3 -edge XANES spectra indicated that a positive shift in absorption energy and change in line shape occur with an increase in the concentration of xenotime structure. Analysis of Sm and Ho M 5 -edge XANES spectra showed that the spectral intensity changes because of a charge-transfer mechanism. The XPS spectra exhibited only a minor shift in binding energy depending on the structure. It has been established in this study that XANES can distinguish between samples that adopt the monazite or xenotime structure.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it