Effect of Pressure Changes during Optical Floating Zone Crystal Growth
Bibliographic record
Abstract
In the process of the growth of the magnetically frustrated pyrochlore holmium titanate, Ho2Ti2O7, fluctuations in the pressure of the optical floating zone image furnace were observed. Upon removal, banding from colour centres was noted. These bands were removed by annealing the material at 600 degrees Celsius for 12 hours. Based on this observation, a series of growths was performed to determine the effects of small pressure fluctuations on the lattice spacing of a material grown by the optical floating zone method. Multiple crystals of holmium titanate were prepared from the same precursor materials, pre-reacted in an identical way and grown under variable overpressures between 2 and 8 atmospheres in both argon and oxygen. Initial measurements using single crystal x-ray diffraction showed that there were differences in the crystallographic lattice spacings that were significantly outside of instrumental error. These differences generally corresponded to a correlation of decreased spacing with increase pressure. This talk will present our recent results of a significantly larger sample set of this material, analyzed using powder x-ray diffraction methods on ground up portions of the grown single crystal.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".