Thulium monoselenide
Chemical compound
From Wikipedia, the free encyclopedia
Thulium monoselenide is a mixed valence[1] compound of selenium and thulium with the chemical formula TmSe.
| Identifiers | |
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3D model (JSmol) |
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| ChemSpider | |
| ECHA InfoCard | 100.031.711 |
| EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| TmSe | |
| Molar mass | 247.89 |
| Density | 9.1 g/cm3 |
| Melting point | 2,060 °C (3,740 °F; 2,330 K) |
| Related compounds | |
Other anions |
TmS TmTe |
Other cations |
ErSe YbSe |
Related compounds |
Tm2Se3 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
Thulium monoselenide can be prepared by directly reacting thulium and selenium:[2]
- Tm + Se → TmSe
Properties
Thulium monoselenide forms reddish-brown cubic crystals,[2] space group Fm3m, unit cell parameters a = 0.5640 nm, Z = 4, and a structure similar to that of sodium chloride.[3][4][2]
The compound melts congruently at 2060 °C, and at 1100 °C and 1730 °C, phase transitions occur in the compound. The Néel temperature of thulium monoselenide is 1.85–2.8 K.[2]