MatWeb, The Online Materials Database

Bismuth Telluride, Bi2Te3 (Tellurobismuthite)

Subcategory: Ceramic; Semiconductor; Sulfide/Chalcogenide

Key Words: Chalcogenide; Semiconductor; Tellurium

Physical Properties	Metric	English	Comments
Density	7.73 g/cc	0.279 lb/in³
a Lattice Constant	4.38 Å	4.38 Å
c Lattice Constant	30.45 Å	30.45 Å
Formula Units/Cell (Z)	3	3
Molecular Weight	800.76 g/mol	800.76 g/mol
Mechanical Properties
Knoop Microhardness	155	155	N/mm²
Hardness, Mohs	1.8	1.8
Electrical Properties
Band Gap	0.21 eV	0.21 eV
Electron Mobility, cm²/V-s	1140	1140
Hole Mobility, cm²/V-s	680	680
Thermal Properties
Specific Heat Capacity	0.016 J/g-°C	0.00382 BTU/lb-°F
Thermal Conductivity	3 W/m-K	20.8 BTU-in/hr-ft²-°F
Melting Point	585 °C	1090 °F
Descriptive Properties
CAS Number	1304-82-1
Color	Gray
Crystal Structure	Hexagonal-Rhombohedral	Tetradymite Structure - R(-3)M
Solubility	Insoluble in H2O; Soluble in EtOH

References are available for this material.