Tin Dioxide (SnO2) Semiconductors

Topics Covered

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


Tin dioxide is an inorganic compound with the chemical formula SnO2. It mainly occurs in the mineral cassiterite, and crystallizes with a tetragonal structure. It is a colorless, amphoteric and diamagnetic solid that is usually thought of as an oxygen-deficient n-type semiconductor.

It is insoluble in water, but dissolves in alkalis and acids. Tin dioxide is purified by reduction of the metal and burning tin in air.


Tin dioxide finds applications in the following areas:

  • Carbon monoxide detectors
  • Catalysis for the oxidation of aromatic compounds
  • Coatings and polishing powders
  • Ceramic glazes.

Chemical Properties

The chemical properties of tin dioxide are provided in the table below:

Chemical Properties
Chemical Formula SnO2
Molecular Weight 150.709
CAS No. 18282-10-5
Group Tin – 14
Oxygen - 16
Crystal Structure Tetragonal

Electrical Properties

The electrical properties of tin dioxide are provided in the table below:

Electrical Properties
Dielectric Constant 9.86
Band Gap 3.57 eV

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of tin dioxide are provided in the tables below:

Thermal Properties
Heat of Formation -280.7 kJ/mol
Standard Molar Entropy 57.2 J/mol K
Specific Heat Capacity 44.3 J/mol K
Mechanical Properties
Density 6.9 – 7 g/cm3
Melting Point 1630°C
Boiling Point 1800 - 1900°C
Optical Properties
Refractive Index 2.006

Safety Information

Safety Information
GHS Hazard Statements H314 - Causes severe skin burns and eye damage
H332 - Harmful if inhaled
H335 - May cause respiratory irritation.
Safety Precautions P350: Gently wash with soap and water
P305+351+338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do – continue rinsing.

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