Iron(II) selenide
| Names | |
|---|---|
| IUPAC name
Iron(II) selenide | |
| Identifiers | |
3D model (JSmol) |
|
| ECHA InfoCard | 100.013.798 |
| EC Number |
|
PubChem CID |
|
| UNII | |
CompTox Dashboard (EPA) |
|
| |
SMILES
| |
| Properties | |
| FeSe | |
| Molar mass | 134.807 g/mol |
| Appearance | black crystals |
| Density | 4.72 g/cm3 |
| Melting point | 965 °C (1,769 °F; 1,238 K) |
| 0.975 mg/100mL | |
| Structure | |
| hexagonal / tetragonal | |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards |
toxic |
| Related compounds | |
Other anions |
Iron(II) oxide Iron(II) sulfide Iron(II) telluride |
Other cations |
Manganese(II) selenide Cobalt(II) selenide |
Except where otherwise noted, 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 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 ferroselite, or the rare pyrite-structure mineral dzharkenite.
It is used in electrical semiconductors.