Isotopically Induced Ferroelectric Phase Transition in SrTi 18 O 3 Studied by Brillouin and Raman Scattering
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Bibliographic record
Abstract
The isotopically induced ferroelectric phase transition of SrTi 18 O 3 , where 87% of oxygen atoms 16 O are exchanged for its isotope 18 O, has been studied by both Brillouin- and Raman scattering. On cooling run, at several degrees above the temperature where the dielectric constant takes a maximum value, the Brillouin spectrum of the c 44 mode in the paraelectric-tetragonal phase begins to split into two transverse acoustic modes. One of them shows a drastic softening with a dip on the spectrum characteristic for coupling with a central peak component. Though the ferroelectric soft A 2 u mode is Raman inactive in the paraelectric phase, it has been observed in the x ( yz )- x geometry indicating a local symmetry breaking. These anomalies suggest existence of a local distribution of the ferroelectric transition point caused by the ferroelectric micro-region.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| 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) | 0.002 | 0.000 |
Machine scores (provisional)
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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