Resolving Composition and Structure of <i>RE</i>–Sb–O–C Natural Superlattice Phases (<i>RE </i>= La, Ho)
Bibliographic record
Abstract
Abstract A family of rare earth antimonide oxycarbides have been prepared and structurally characterized. These superlattice phases are constructed from NaCl‐type RESb slabs sandwiched between RE–O–C layers. Depending on the carbon content and synthetic conditions, three different RE–Sb–O–C structures can be obtained. At lower temperatures,RE9–δSb5(O,C)5 phases are obtained for RE = La, Ho. These phases adopt a stuffed Sc2Sb‐type structure with P4/nmm symmetry. An O/C mixture, in which the O/C ratio is larger than 4:1, is randomly distributed within the RE–O–C layers. The RE atoms are highly disordered within the oxide layer. At temperatures above the melting point of the samples, RE9Sb5O4C phases with P4/n symmetry are produced. The RE–O–C layers in RE9Sb5O4 are fully ordered; the RE sites are well defined, and the O and C atoms occupy the tetrahedral and square‐pyramidal voids, respectively. At high temperatures, a new ordered La14Sb8O7C structure with P4bm symmetry was discovered. The La14Sb8O7C phase is structurally similar to RE9Sb5O4C and features orderedarrangements of La and O/C atoms in the La–O–C layer. The RE9–δSb5(O,C)5, RE9Sb5O4C and La14Sb8O7C phases appear to be charge‐balanced, and their compositions and structures are controlled by the O/C ratio. Parallel preparative experiments revealed the importance of carbon in the formation of these layered phases. In addition, it has been established that the purity of the rare earth metals influences the compositions and structures of the products.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".