Iron(II) selenide
| Iron(II) selenide | ||
|---|---|---|
| IUPAC name Iron(II) selenide | ||
| Identifiers | ||
| CAS number | 1310-32-3 | |
| PubChem | 14795 | |
| EC number | 215-177-1 | |
| Jmol-3D images | {{#if:[Fe]=[Se]|Image 1 | |
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| Properties | ||
| Molecular formula | FeSe | |
| Molar mass | 134.81 g/mol | |
| Appearance | black crystals | |
| Density | 4.72 g/cm3 | |
| Melting point | 965 °C; 1,769 °F; 1,238 K | |
| Solubility in water | 0.975 g/100 mL | |
| Structure | ||
| Crystal structure | hexagonal | |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | ||
| Infobox references | ||
Iron(II) selenide refers to a number of inorganic compounds of ferrous iron and selenide (Se2-). The phase diagram of the system Fe-Se [1] reveals the existence of several non-stoichiometric phases between ~49 at. % Se and ~53 at. % Fe, and temperatures up to ~450 °C. The low temperature stable phases are the tetragonal PbO-structure (P4/nmm) β-Fe1-xSe and α-Fe7Se8. The high temperature phase is the hexagonal, NiAs structure (P63/mmc) δ-Fe1-xSe. Iron (II) selenide occurs naturally as the NiAs-structure mineral achavalite.
More selenium rich iron selenide phases are the γ phases (γ and γˈ), assigned the Fe3Se4 stoichiometry, and FeSe2, which occurs as the marcasite-structure natural mineral feroselite, or the rare pyrite-structure mineral dzharkenite.
It is used in electrical semiconductors.
References
- ↑ Okamoto, H. “The Fe-Se (Iron-Selenium) System.” Journal of Phase Equilibria 12, no. 3 (1991): 383–389.
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