Effect of Composition and Atmosphere on Electrical Properties of Donor-doped BaCe<sub>1-(x+y)</sub>Zr<sub>x</sub>Nb<sub>y</sub>O<sub>3</sub>
Bibliographic record
Abstract
The properties of donor-doped barium cerate perovskites have recently gained attention as electrode or electrolyte materials for high temperature solid-state devices utilizing CO2 containing gas streams due to their excellent chemical stability. In this study, the effect of co-doping BaCeO3 with Nb and Zr on electrical conductivity from 300-700 ˚C in air and in H2 is investigated. Small doping levels give rise to a significant increase in total conductivity in both air and hydrogen environments compared to BaCeO3. In air, activation energies for conduction are ~1 eV. In a reducing environment, the Nb appears to be the species more easily reduced in order to give rise to increased total conductivity, and there is a discontinuous change in total activation energy from ~0.55 eV to ~0.3 eV at low temperatures in H2. The transition temperature is dependent on dopant concentration. These materials may provide chemically-stable mixed conducting anode materials for high temperature proton conductors.
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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".