Phase Relations In the Fe–Ni–s System From 875 To 650 °C
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Bibliographic record
Abstract
Abstract High-form pentlandite of composition Fe 4.93 Ni 4.06 S 8.01 first crystallizes by peritectic reaction between liquid and monosulfide solid-solution at 870 ± 3 °C (865 ± 3 °C for high-form pentlandite with Fe=Ni in at.%) in the Fe–Ni–S system; it forms a limited solid-solution from Fe 5.08 Ni 3.93 S 7.99 to Fe 3.81 Ni 5.24 S 7.96 including the ideal composition Fe 4.50 Ni 4.50 S 8.00 at 850 °C. The solid solution grows rapidly to extend its field toward the Ni-rich side with decreasing temperature and connects with β 2 (44.7 at.% S) in the Ni–S join at 806 ± 3 °C (peritectic between liquid and Ni 1– x S). Below the peritectic temperature, high-form pentlandite (metal-rich composition) crystallizes directly from liquid. This crystallization continues to the eutectic (746 ± 3 °C for the high form with Fe=Ni) with decreasing temperature, and the high-form solid solution grows still more. Crystallization of the monosulfide solid-solution and high-form pentlandite solid solution from liquid finishes at 762 ± 3 °C and 739 ± 3 °C, respectively. The high-form pentlandite solid solution extended from the Ni–S join is maintained at 700 and 650 °C and coexists with monosulfide solid-solution and/or with liquid (870 to 739 °C), and/or with β 1 or its solid solution (800 to 503 °C), and/or with γ (762 to 579 °C). In geological processes such as the formation of Ni-Cu ore deposits, pentlandite can crystallize as the high form from liquid (sulfide magma) by peritectic and eutectic reactions at comparatively high temperatures from 870 to 739 °C (Fe–Ni–S system). Pentlandite is also produced by the breakdown of the high form at the pseudoeutectoid (or ternary eutectoid). Pentlandite can further be formed by exsolution from monosulfide solid-solution below 600 °C, and from the ternary β 1 phase.
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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) | 0.000 | 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 it