Effect of Atomic Layer Deposited Al<sub>2</sub>O<sub>3</sub> on Sintering Behavior of ZnO Nanopowders
Bibliographic record
Abstract
Atomic layer deposition (ALD) is demonstrated as an effective technique for conformally coating nanoparticles with ultrathin diffusion barrier layers to control grain growth during sintering. In this study, ALD aluminum oxide (Al 2 O 3 ) films are deposited on zinc oxide (ZnO) nanoparticles (∼60 nm diameter) and subjected to sintering at 850 °C under uniaxial loading of 150 MPa. Uncoated ZnO forms a densified ceramic with grain sizes of 2.76 ± 0.50 μm. In contrast, ALD-coated nanoparticles exhibit restricted grain growth. A 1 nm Al 2 O 3 coating limits the sintered ZnO grains to 89 ± 23 nm, and a 10 nm coating restricts the ZnO grains to 55 ± 7 nm. These results underscore the effectiveness of ALD to engineer grain boundary diffusion barriers and, when integrated with conventional processing methods, its potential for enabling the scalable manufacturing of nanocrystalline ceramics for use as transparent bulk materials with noncubic crystal structures.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".