Ultrafine-grained LaB <sub>6</sub>–ZrB <sub>2</sub> composite ceramics with superior mechanical and thermionic emission properties prepared by high-pressure sintering
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
In this study, ultrafine-grained LaB<sub>6</sub>–ZrB<sub>2</sub> composite ceramics were successfully synthesized by sintering a mixture of self-produced LaB<sub>6</sub> nanopowder and commercial ZrB<sub>2</sub> nanopowder under high pressure. Compared with their coarse-grained counterparts, ultrafine-grained ceramics exhibit improved mechanical properties. Notably, the ultrafine-grained LaB<sub>6</sub>–ZrB<sub>2</sub> composite ceramic sintered at 4 GPa and 1673 K, with an average grain size of 286 nm, shows optimal mechanical performance characterized by a Vickers hardness of 25.6 GPa, a fracture toughness of 4.1 MPa·m<sup>1/2</sup>, and an elastic modulus of 338 GPa. Furthermore, the ultrafine-grained LaB<sub>6</sub>–ZrB<sub>2</sub> composite ceramics displayed strong thermal emission, reaching a maximum current density of 27.5 A∙cm<sup>−2</sup> at 1773 K. The structural and functional advantages of ultrafine-grained LaB<sub>6</sub>–ZrB<sub>2</sub> composite ceramics render them suitable for potential use in thermionic emission cathodes.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 it