| Selenium, Se | |
|---|---|
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Export data to your CAD/FEA program| Physical Properties | Metric | English | Comments | ||
|---|---|---|---|---|---|
Density  | 3.91 g/cc @Temperature 406 °C | 0.141 lb/in³ @Temperature 763 °F | Liquid | ||
| 3.975 g/cc @Temperature 217 °C | 0.1436 lb/in³ @Temperature 423 °F | Liquid | |||
| 4.02 g/cc @Temperature 305 °C | 0.145 lb/in³ @Temperature 581 °F | Liquid | |||
| 4.06 g/cc @Temperature 267 °C | 0.147 lb/in³ @Temperature 513 °F | Liquid | |||
| 4.28 g/cc @Temperature 20.0 °C | 0.155 lb/in³ @Temperature 68.0 °F | Vitreous | |||
| 4.389 g/cc @Temperature 25.0 °C | 0.1586 lb/in³ @Temperature 77.0 °F | alpha phase | |||
| 4.47 g/cc @Temperature 25.0 °C | 0.161 lb/in³ @Temperature 77.0 °F | beta phase | |||
| 4.809 g/cc @Temperature 25.0 °C | 0.1737 lb/in³ @Temperature 77.0 °F | gamma phase | |||
| a Lattice Constant | 4.36 Å | 4.36 Å | Gray Selenium | ||
| c Lattice Constant | 4.95 Å | 4.95 Å | Gray Selenium | ||
| Vapor Pressure | 0.001013 bar @Temperature 344 °C | 0.7598 torr @Temperature 651 °F | |||
| 0.01013 bar @Temperature 431 °C | 7.598 torr @Temperature 808 °F | ||||
| 0.1013 bar @Temperature 540 °C | 75.98 torr @Temperature 1000 °F | ||||
| 1.013 bar @Temperature 684.9 °C | 759.8 torr @Temperature 1265 °F | ||||
| Surface Tension | 98 dynes/cm @Temperature 280 °C | 98 dynes/cm @Temperature 536 °F | |||
| 98.2 dynes/cm @Temperature 310 °C | 98.2 dynes/cm @Temperature 590 °F | ||||
| 100.5 dynes/cm @Temperature 250 °C | 100.5 dynes/cm @Temperature 482 °F | ||||
| 105.5 dynes/cm @Temperature 220 °C | 105.5 dynes/cm @Temperature 428 °F | ||||
| Chemical Properties | Metric | English | Comments | ||
| Atomic Mass | 78.96 | 78.96 | 1995 | ||
| Atomic Number | 34 | 34 | |||
| Thermal Neutron Cross Section | 11.8 barns/atom | 11.8 barns/atom | |||
| X-ray Absorption Edge | 0.979 Å | 0.979 Å | K | ||
| 7.467 Å | 7.467 Å | LI | |||
| 8.4212 Å | 8.4212 Å | LII | |||
| 8.6624 Å | 8.6624 Å | LIII | |||
| Critical Temperature | 1493 °C | 2719 °F | Gray Se | ||
| Electronegativity | 2.55 | 2.55 | Pauling | ||
| Ionic Radius | 0.420 Å | 0.420 Å | Crystal Ionic Radius for Valence +6 | ||
| 0.500 Å | 0.500 Å | Crystal Ionic Radius for Valence +4 | |||
| 0.660 Å | 0.660 Å | Crystal Ionic Radius for Valence +1 | |||
| 1.91 Å | 1.91 Å | Crystal Ionic Radius for Valence -2 | |||
| 2.32 Å | 2.32 Å | Crystal Ionic Radius for Valence -1 | |||
| Electrochemical Equivalent | 0.50 g/A/h | 0.50 g/A/h | |||
| Mechanical Properties | Metric | English | Comments | ||
| Knoop Microhardness | 350 | 350 | N/mm² Microhardness Gray Selenium | ||
| Modulus of Elasticity | 57.9 GPa | 8400 ksi | |||
| Shear Modulus | 6.46 GPa | 937 ksi | |||
| Electrical Properties | Metric | English | Comments | ||
| Electrical Resistivity | 0.0000120 ohm-cm | 0.0000120 ohm-cm | |||
| Magnetic Susceptibility | -0.0000221 | -0.0000221 | Gray Selenium; Atomic (cgs) | ||
| -3.20e-7 | -3.20e-7 | cgs/g | |||
| Critical Superconducting Temperature | 6.75 – 6.95 K | 6.75 – 6.95 K | 6.75, 6.95 at ~13.0 GPa pressure for Se II | ||
| Dielectric Constant | 6.6 @Frequency 1e+8 Hz | 6.6 @Frequency 1e+8 Hz | Gray Selenium | ||
| Band Gap | 1.5 eV | 1.5 eV | Gray Selenium | ||
| Hole Mobility, cm²/V-s | 5.0 | 5.0 | Gray Selenium | ||
| Thermal Properties | Metric | English | Comments | ||
| Heat of Fusion | 84.0 J/g | 36.1 BTU/lb | |||
| Heat of Vaporization | 3140 J/g | 1350 BTU/lb | |||
| CTE, linear | 17.89 µm/m-°C @Temperature 20.0 °C | 9.939 µin/in-°F @Temperature 68.0 °F | Gray Selenium, Perpendicular to c-axis | ||
| 37.0 µm/m-°C @Temperature 20.0 – 100 °C | 20.6 µin/in-°F @Temperature 68.0 – 212 °F | vitreous Se | |||
| 49.0 µm/m-°C @Temperature 20.0 – 100 °C | 27.2 µin/in-°F @Temperature 68.0 – 212 °F | for gamma Se | |||
| 74.1 µm/m-°C @Temperature 20.0 °C | 41.2 µin/in-°F @Temperature 68.0 °F | Gray Selenium; Parallel to c-axis | |||
| Specific Heat Capacity | 0.2926 J/g-°C | 0.06993 BTU/lb-°F | Gray Selenium | ||
| 0.352 J/g-°C | 0.0841 BTU/lb-°F | ||||
| Thermal Conductivity | 1.31 W/m-K | 9.09 BTU-in/hr-ft²-°F | Gray Selenium; Parallel to c-axis | ||
| 2.90 W/m-K | 20.1 BTU-in/hr-ft²-°F | ||||
| 4.52 W/m-K | 31.4 BTU-in/hr-ft²-°F | Gray Selenium; Perpendicular to c-axis | |||
| Melting Point | 220 °C | 428 °F | |||
| Boiling Point | 685 °C | 1270 °F | |||
| Optical Properties | Metric | English | Comments | ||
| Refractive Index | 2.50 | 2.50 | Gray Selenium | ||
| Component Elements Properties | Metric | English | Comments | ||
| Selenium, Se | 100 % | 100 % | |||
| Descriptive Properties | |||||
| CAS Number | 7782-49-2 | ||||
References for this datasheet.
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