Selenium, Se

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Selenium, Se
Categories:	Metal; Nonferrous Metal; Other Engineering Material; Semiconductor; Pure Element
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Categories:

Metal; Nonferrous Metal; Other Engineering Material; Semiconductor; Pure Element

Vendors:

Click here to view all available suppliers for this material.

Please click here if you are a supplier and would like information on how to add your listing to this material.

Printer friendly version

Download as PDF

Download to Excel (requires Excel and Windows)

Export data to your CAD/FEA program

Add to Folder:

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	L_I
	8.4212 Å	8.4212 Å	L_II
	8.6624 Å	8.6624 Å	L_III
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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