PRECURSOR DYNAMICS OF<font>Pb(B<sub>1/2</sub>B′<sub>1/2</sub>)O<sub>3</sub></font>-TYPE RELAXOR FERROELECTRICS STUDIED BY BROADBAND MICRO-BRILLOUIN SCATTERING
Why this work is in the frame
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Bibliographic record
Abstract
This paper reviews the recent progress in the understanding of the dynamics of Pb(B 1/2 B′ 1/2 )O 3 -type relaxor ferroelectrics using of broadband micro-Brillouin scattering spectroscopy, which covers a large frequency range from 1 to 1000 GHz by a tandem multi-pass Fabry–Perot interferometer. In contrast to Pb(B 1/3 B′ 2/3 )O 3 -type relaxors, there is no frustration on the B-site of perovskite structure and the degree of order of B-site cations depends on heat treatment. Remarkable softening of sound velocity and an intense central peak are observed above the Curie temperature T C owing to the polarization fluctuations in polar nanoregions (PNRs). Unlike the Pb(B 1/3 B′ 2/3 )O 3 relaxors, Pb(B 1/2 B′ 1/2 )O 3 does not undergoes a typical diffuse phase transition without lead vacancies on A-site which enhances random fields. For the (1-x) Pb ( B 1/2 B ′ 1/2 ) O 3 –x PbTiO 3 solid solutions, the long range polar order increases as the PbTiO 3 content increases. Nevertheless, a central peak owing to dynamic PNRs still remains even for the composition near the MPB, and a critical slowing down is clearly observed in the vicinity of T C .
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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 | 0.004 | 0.003 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.002 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| 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