Relationship between oxide-ion conductivity and ordering of oxygen vacancy in the<i>Ln</i><sub>2</sub>Zr<sub>2</sub>O<sub>7</sub>(<i>Ln</i>= La, Nd, Eu) system having a pyrochlore composition
Bibliographic record
Abstract
The crystal structures of the Ln 2 Zr 2 O 7 ( Ln = La, Nd, Eu) systems having a pyrochlore-type composition were refined by the Rietveld analyses of the XRD data combined with MEM-based pattern fitting. All the samples showed a single phase of the pyrochlore-type structure. The oxide-ion conductivities of the present samples were discussed on the basis of the ordering of oxygen vacancy in the pyrochlore-type structure. The Rietveld analyses of XRD data showed that the degree of the oxygen 8b site occupancy at R.T. was estimated to be 0.0, 0.27 and 0.48 for La 2 Zr 2 O 7 , Nd 2 Zr 2 O 7 and Eu 2 Zr 2 O 7 , respectively. The increase in the 8b site occupancy means the increase of incompleteness of the pyrochlore-type structure. The oxide-ion conductivity increased with increase in the 8b site occupancy which can be recognized to be a measure of the incompleteness of the pyrochlore-type structur. The oxide-ion conduction of Eu 2 Zr 2 O 7 was ascribed to diffusion of oxygen along <100> direction, while the hole conduction of La 2 Zr 2 O 7 occurred along <110> direction, according to the charge density map estimated by the MEM analysis.
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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 | 0.001 |
| 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".