Pressure-induced structural changes in ZnS
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Bibliographic record
Abstract
We report detailed data on the structural parameters and equations of state of high-density ZnS obtained by x-ray diffraction using synchrotron radiation for pressures below 96 GPa. It is shown that initial room condition phases of ZnS, zinc blende and wurtzite, transform unambiguously to the rocksalt structure at 12 GPa and at room temperature. Our data hence rule out the existence of an intermediate phase of the cinnabar type in ZnS. The initial zinc-blende and wurtzite phases present quantitatively similar equations of state parametrized by ${B}_{0}=79.5 \mathrm{GPa}$ and ${B}_{0}^{\ensuremath{'}}=4,$ and ${B}_{0}=80.1 \mathrm{GPa}$ and ${B}_{0}^{\ensuremath{'}}=4,$ respectively. As compared to the initial phases, the rocksalt phase, adopted at higher pressure, is denser and less compressible with ${B}_{0}=117.6 \mathrm{GPa}$ and ${B}_{0}^{\ensuremath{'}}=4.$ The high-pressure rocksalt structure is also shown to be unstable for pressures in excess of 65 GPa, leading to a transition to the $\mathrm{Cmcm}$ structure, an orthorhombic distortion, without a significant change in volume. The occurrence of the $\mathrm{Cmcm}$ structure in dense ZnS is in line with the observed dense phases in other zinc chalcogenides.
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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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 0.002 |
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