Electrical transport properties of In-doped Ce1−xInxO2−δ (x = 0.1; 0.2)
Bibliographic record
Abstract
We report the synthesis and electrical conductivity of fluorite-type Ce(1-x)In(x)O(2-delta) (x = 0.1; 0.2) in air, dry Ar, N(2) and H(2) in the temperature range of 300-800 degrees C. We have employed a new CO(2) capture technique to prepare the "metastable" fluorite-related structure Ce(1-x)In(x)O(2-delta) from the corresponding In-doped Ba-containing perovskite of the nominal chemical formula BaCe(1-x)In(x)O(3-delta) at 800 degrees C. The amount of CO(2) gained per ceramic gram was found to be consistent with the formation of BaCO(3), confirming the complete leaching of Ba in BaCe(1-x)In(x)O(3-delta). The CO(2) capture efficiency was found to be in the range of 90-99% at 800 degrees C, which is significantly higher than those of well-known low-temperature CO(2) absorbing materials, including Li(2)O, Li(6)Zr(2)O(7), Li(1.8)Na(0.2)ZrO(3) and LiNaZrO(3). Powder X-ray diffraction (PXRD) and energy dispersive X-ray analysis (EDAX) confirmed the perovskite into fluorite structural transformation reaction. The AC impedance study showed a clear intercept to the real axis at the low-frequency over the investigated temperatures in all the atmospheres, indicating a non-blocking nature of electrode (Pt) and electrolyte interface. The constant phase element (CPE) value was found to be in the order of 10(-10) F in air, N(2) and Ar for high-frequency part of the semicircle due to bulk contribution, and about two orders of magnitude lower values were observed for the low-frequency semicircle which may correspond to grain-boundary effect. The 20 mol% In-doped CeO(2) exhibits a total electrical conductivity of about 4 x 10(-6) S/cm at 600 degrees C in Ar, while in H(2) an about four orders of magnitude higher electrical conductivity of 3 x 10(-2) S/cm was observed. The activation energy for electrical conductivity was found to be 1.36 eV in Ar, 1.43 eV in N(2), 1.34 eV in H(2), and 1.1 eV in air for Ce(0.8)In(0.2)O(1.9).
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How this classification was reachedexpand
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) | 0.001 | 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 teacher head, 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".