Iron Disulfide (FeS2) Semiconductors

Topics Covered

Chemical Properties
Electrical Properties
Thermal, Mechanical and Optical Properties
Safety Information


Iron disulfide is a cubic  chemical compound with the formula FeS2. It is usually found associated with other sulfides or oxides in metamorphic rock, sedimentary rock and quartz veins. It is dark gray to black in color, and also possesses a metallic luster and pungent odor. 


Iron disulfide finds applications in the following areas:

  • Lithium metal sulfide batteries
  • Molding compounds
  • Production of sulfuric acid
  • Battery recycling
  • Solar photovoltaics.

Chemical Properties

The chemical properties of iron disulfide are provided in the table below:

Chemical Properties
Chemical Formula FeS2
Molecular Weight 87.91
CAS No. 1317-37-9
Group Iron – 8
Sulfur – 16
Crystal Structure Cubic
Lattice Constant 5.4175 Å

Electrical Properties

The electrical properties of iron disulfide are provided in the table below:

Electrical Properties
Intrinsic Carrier Concentration 1 x1019 cm-3
Band Gap 0.95 eV

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of iron disulfide are provided in the tables below:

Thermal Properties
Decomposition Temperature 600°C
Heat of Vaporization 18.67 kJ/mol
Mechanical Properties
Density 5.02 g/cm3
Melting Point 1194°C
Mohs Hardness 6.3
Optical Properties
Refractive Index 1.56

Safety Information

Safety Information
Risk Phrases R32 - Contact with acids liberates very toxic gas
R36 - Irritating to eyes
R37 - Irritating to respiratory system
R38 - Irritating to skin.
Safety Phrases S 26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S 36 - Wear suitable protective clothing
S 37 - Wear suitable gloves
S 39 - Wear eye/face protection.


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