Selenium, Se

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

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	Original Value	Comments

Density	3.91 g/cc @Temperature 406 °C	Liquid
	3.975 g/cc @Temperature 217 °C	Liquid
	4.02 g/cc @Temperature 305 °C	Liquid
	4.06 g/cc @Temperature 267 °C	Liquid
	4.28 g/cc @Temperature 20.0 °C	Vitreous
	4.389 g/cc @Temperature 25.0 °C	alpha phase
	4.47 g/cc @Temperature 25.0 °C	beta phase
	4.809 g/cc @Temperature 25.0 °C	gamma phase
a Lattice Constant	4.36 Å	Gray Selenium
c Lattice Constant	4.95 Å	Gray Selenium
Vapor Pressure	0.001013 bar @Temperature 344 °C
	0.01013 bar @Temperature 431 °C
	0.1013 bar @Temperature 540 °C
	1.013 bar @Temperature 684.9 °C
Surface Tension	98 dynes/cm @Temperature 280 °C
	98.2 dynes/cm @Temperature 310 °C
	100.5 dynes/cm @Temperature 250 °C
	105.5 dynes/cm @Temperature 220 °C

Chemical Properties	Original Value	Comments
Atomic Mass	78.96	1995
Atomic Number	34
Thermal Neutron Cross Section	11.8 barns/atom
X-ray Absorption Edge	0.979 Å	K
	7.467 Å	L_I
	8.4212 Å	L_II
	8.6624 Å	L_III
Critical Temperature	1493 °C	Gray Se
Electronegativity	2.55	Pauling
Ionic Radius	0.420 Å	Crystal Ionic Radius for Valence +6
	0.500 Å	Crystal Ionic Radius for Valence +4
	0.660 Å	Crystal Ionic Radius for Valence +1
	1.91 Å	Crystal Ionic Radius for Valence -2
	2.32 Å	Crystal Ionic Radius for Valence -1
Electrochemical Equivalent	0.50 g/A/h

Mechanical Properties	Original Value	Comments
Knoop Microhardness	350	N/mm² Microhardness Gray Selenium
Modulus of Elasticity	57.9 GPa
Shear Modulus	6.46 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000120 ohm-cm
Magnetic Susceptibility	-0.0000221	Gray Selenium; Atomic (cgs)
	-3.20e-7	cgs/g
Critical Superconducting Temperature	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	Gray Selenium
Band Gap	1.5 eV	Gray Selenium
Hole Mobility, cm²/V-s	5.0	Gray Selenium

Thermal Properties	Original Value	Comments
Heat of Fusion	84.0 J/g
Heat of Vaporization	3140 J/g
CTE, linear	17.89 µm/m-°C @Temperature 20.0 °C	Gray Selenium, Perpendicular to c-axis
	37.0 µm/m-°C @Temperature 20.0 - 100 °C	vitreous Se
	49.0 µm/m-°C @Temperature 20.0 - 100 °C	for gamma Se
	74.1 µm/m-°C @Temperature 20.0 °C	Gray Selenium; Parallel to c-axis
Specific Heat Capacity	0.2926 J/g-°C	Gray Selenium
	0.352 J/g-°C
Thermal Conductivity	1.31 W/m-K	Gray Selenium; Parallel to c-axis
	2.90 W/m-K
	4.52 W/m-K	Gray Selenium; Perpendicular to c-axis
Melting Point	220 °C
Boiling Point	685 °C

Optical Properties	Original Value	Comments
Refractive Index	2.50	Gray Selenium

Component Elements Properties	Original Value	Comments
Selenium, Se	100 %

Descriptive Properties
CAS Number	7782-49-2

References for this datasheet.

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