THE SYSTEM Fe Co Ni As S. I. PHASE RELATIONS IN THE (Fe,Co,Ni)As0.5S1.5 SECTION AT 650 AND 500 C
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Bibliographic record
Abstract
The phase relations in the sulfur-rich regions of the system Fe–Co–Ni–As–S were investigated with mineral syntheses, and characterization of the products by electron-microprobe analysis and powder X-ray diffraction. The experimental charges were weighed with an atomic ratio (Fe + Co + Ni) /(As + S) of 1:2 and a S:As ratio of 3:1. Two isothermal sections were investigated, 500 ° and 650°C. The 500°C experiments resulted in the formation of arsenopyrite, cobaltite, cattierite, gersdorffite, linnaeite, monosulfide solid-solution, pyrite, siegenite and vaesite. Pyrite, the most common phase, is found in all Fe-bearing assemblages. The phase assemblages formed at 650°C involve cattierite, vaesite, cobaltite and gersdorffite in Fe-poor samples. In Fe-rich samples, the phase assemblage is dominated by monosulfide solid-solution and As1–xSx melt. The formation of this melt made it possible to estimate the activity of sulfur, using the constraints of Barton (1969). Cobaltite, cattierite and gersdorffite all show extensive solid-solution with respect to Co–Ni and As–S. All the Me(As,S)2 phases have a pyrite-type structure with a disordered distribution of As and S (space group Pa3); the unit-cell parameter a was determined.
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Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 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 | 0.003 | 0.001 |
| 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 |
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