Temperatures
Melting point: 494 [221 °C (430 °F)] K
Boiling point: 958 [685 °C (1265 °F)] K
Liquid range: 464 K
Critical temperature: 1766 [1493 °C (2719 °F)] K
Superconduction temperature: (no data) K
Enthalpies
Enthalpy of fusion: 5.4 kJ mol-1
Enthalpy of vaporisation: 26 kJ mol-1
Enthalpy of atomisation: 227 kJ mol-1
Thermodynamic data
This table gives a fewthermodynamic data for selenium. Most values are those given in the NBS technical notes (reference 1) after conversion from the units used within those notes. Values labelled with an asterisk (*) are Committee on Data for Science and Technology (CODATA) agreed values for the thermodynamic properties of key chemical substances (reference 2). These values are published in a number of places including the WWW (reference 3).
| State | ΔfH° | ΔfG° | S° | CpH | H°298.15‑H°0 |
|---|---|---|---|---|---|
| Units | kJ mol‑1 | kJ mol‑1 | J K‑1 mol‑1 | J K‑1 mol‑1 | kJ mol‑1 |
| Solid (hexagonal | 0 | 0 | 42.44 | 25.36 | 5.52 |
| Solid (monoclinic | 7 | ||||
| Gas | 227.1 | 187.1 | 176.6 | 20.83 | 6.199 |
| Gas (Se2) | 146 | 96 | 252 | 35.4 | 9.52 |
Notes
This tables gives a fewthermodynamic data. Most values are those given in the NBS technical notes (reference 1) after conversion from the units used within those notes. Values labelled with an asterisk (*) are Committee on Data for Science and Technology (CODATA) agreed values for the thermodynamic properties of key chemical substances (reference 2). These values are published in a number of places including the WWW (reference 3).
References
- R.H. Schumm, D.D. Wagman, S. Bailey, W.H. Evans, and V.B. Parker in National Bureau of Standards (USA) Technical Notes 270-1 to 270-8, 1973.
- http://www.codata.info/resources/databases/key1.html
- J.D. Cox, DD., Wagman, and V.A. Medvedev,CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, USA, 1989.