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Amorphous selenium is either a reddish powder or a black, vitreous solid; crystalline selenium is either red or gray, depending on the crystal structure. This element resembles sulfur in its various forms and in its compounds. Selenium has many electrical properties, being both photovoltaic, where light converts to increased illumination. Below its melting point, selenium is a p-type semiconductor.
|Property Name||Property Value||Property Name||Property Value|
|Atomic Code||(34Se78.96)||First Ionization Energy||225K-cal/g-mole|
|Melting Point||217°C||Mohs Hardness @ 20°C||2.0|
|Boiling Point||685°C||Coefficient of Thermal Expansion||3.79x10-5K-1|
|Density (amorphous)||4.28g/cm3||Thermal Expansion||2.8-7.3ppm/°C|
|Themal Conductivity||7-18.3x10-4cal/cm2/cm/s/°C||Electrical Resistivity||12µΩ-cm|
|Specific Heat @ 25°C||0.084cal/g°C||Crystal Structure||Hexagonal|
|Heat of Fusion||1.25k-cal/g-atom||Volume Compressibility||12.2x10-5atm-1|
|Heat of Vaporization||3.34k-cal/g-atom||Magnetic Susceptibility||-0.32x10-6cgs|