Titanium Dioxide (TiO2) Semiconductors

Topics Covered

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

Description

Titanium dioxide, also known as titania or titanium(IV) oxide, is a naturally occurring oxide of titanium with the chemical formula TiO2. The most common method of producing titanium dioxide is mixing ilmenite with sulfuric acid which reacts to remove the iron oxide group in the ilmenite.

It is incompatible with strong acids and strong reducing agents and violent reactions occur with electropositive molten metals such as lithium, zinc, sodium, magnesium, calcium and aluminum.

Applications

Titanium dioxide finds applications in the following:

  • Ceramic glazes
  • Sunscreen and UV blocking pigments in cosmetic and skin care products
  • Plastics
  • Photocatalysts
  • Electronic data storage media
  • Memristors.

Chemical Properties

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

Chemical Properties
Chemical Formula TiO2
Molecular Weight 79.866
CAS No. 13463-67-7
Group Titanium – 4
Oxygen - 16
Crystal Structure Tetragonal
Lattice Constant a = 4.5937 Å
c = 2.9618 Å

Electrical Properties

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

Electrical Properties
Electrical Resistivity 1.00e+13 - 1.00e+18 Ω cm
Magnetic Susceptibility 0.0000059
Dielectric Constant 86
Dielectric Strength 4 – 8 kV/mm
Dissipation Factor 0.00020 – 0.0050

Thermal, Mechanical and Optical Properties

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

Thermal Properties
Thermal Expansion Coefficient 7.14 µm/m°C
Thermal Conductivity 7.40 W/mK
Mechanical Properties
Density 4.23 g/cm3
Melting Point 1855°C
Mohs Hardness 6.2
Optical Properties
Refractive Index 2.6
UV Transmittance 10%
Reflection Coefficient 0.49

Safety Information

Safety Information
Risk Phrases H351 - Suspected of causing cancer.
Safety Phrases P281 - Use personal protective equipment as required.

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