Aug 16 2013
Topics Covered
Description
Applications
Chemical Properties
Electrical Properties
Thermal, Mechanical and Optical Properties
Safety Information
Description
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.
Applications
Tin dioxide finds applications in the following areas:
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Carbon monoxide detectors
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Catalysis for the oxidation of aromatic compounds
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Coatings and polishing powders
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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. |