CRYSTAL CHEMISTRY OF TETRAHEDRITE SOLID-SOLUTION: EPR AND MAGNETIC INVESTIGATIONS
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
One hundred and thirty samples from the collection of the Natural History Museum in Florence, labeled as tetrahedrite, have \nbeen extensively studied by means of SEM, XRD, EPMA, DTA, EPR and SQUID techniques. Wide-ranging substitutions, \nconfirmed by compositional data, play a fundamental role in the thermal behavior, “stabilizing” natural tetrahedrite with respect \nto the synthetic equivalent. In order to determine the valence state and site occupancies of Cu and Fe, electron paramagnetic \nresonance (EPR) and magnetic measurements were performed on selected samples of natural tetrahedrite. EPR measurements \nwere performed down to 130 K, and magnetic susceptibility measurements, in the range 2–300 K. EPR magnetic parameters were \ndetermined on the basis of spectral simulations. The behaviour of ––1 versus temperature was interpreted by means of \nHeisenberg’s model, thus yielding values for the Curie and Weiss constants. All samples are characterized by the presence of \nsmall amounts of Cu2+ and Fe2+; Fe3+ was detected only in metal-deficient samples. Both Cu and Fe occupy the tetrahedral site; \nwhereas in some samples the former appears aggregated in dimers, the latter is randomly distributed over the lattice. The results \nof the study confirm the crystal-chemical formula of the tetrahedrite samples investigated.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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