Anisotropic stress in laser-written LaBGeO5 glass-ceramic composites
Bibliographic record
Abstract
LaBGeO5 glass-ceramic composite materials are of interest because the LaBGeO5 crystal phase is ferroelectric and can be grown in single-crystal form within the glass by localized heating from femtosecond laser irradiation. The crystals formed are expected to exhibit residual stress, due to the different mechanical properties of the glass and crystal phases. Recent micro-Raman data on these crystals have been interpreted as showing an isotropic stress field in the crystals. Here, we reinterpret these data in light of detailed density functional perturbation calculations of the Raman spectra of the crystal phase under different stress conditions. Our results support a model where the stress in the ab plane of the LaBGeO5 crystal is compressive and the stress along the c axis of the crystal is tensile. This model is consistent with the linear thermal expansion coefficients of the LaBGeO5 crystal, which are anisotropic and of differing sign. These results indicate the complexity of crystal formation in this system and possible limitations of using it in optical devices where a uniform stress state would be required.
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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) | 0.000 | 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".