Barium Titanate (BaTiO3) Semiconductors

Topics Covered

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

Description

Barium titanate is an inorganic compound with the chemical formula BaTiO3. It is a white powder which is transparent as larger crystals. This titanate is a ferroelectric ceramic material, having piezoelectric properties and a photorefractive effect. It can exist in five phases including hexagonal, cubic, tetragonal, orthorhombic, and rhombohedral crystal structure. All the phases exhibit the ferroelectric effect except the cubic phase. It can be manufactured by heating barium carbonate and titanium dioxide.

Applications

Barium titanate is a dielectric ceramic used for capacitors. As a piezoelectric material, it was largely replaced by lead zirconate titanate, but has been widely used in microphones and other transducers.

Polycrystalline barium titanate exhibits positive temperature coefficient, which makes it a useful material for thermistors and other self-regulating electric heating systems.

Barium titanate material can be operated at visible and near-infrared wavelengths, and has high beam-coupling gain, and hence it is widely used for self-pumped phase conjugation applications. The material is doped with various other elements like iron for photorefractive applications.

The pyroelectric and ferroelectric properties of barium titanate enable it to be used in uncooled sensors of thermal cameras.

Chemical Properties

The chemical properties of barium titanate are provided in the table below:

Chemical Properties
Chemical Formula BaTiO3
Molecular Weight 233.192
CAS No. 12047-27-7
Group Barium – 2
Titanium - 4
Crystal Structure Tetragonal

Electrical Properties

The electrical properties of barium titanate are provided in the table below:

Electrical Properties
Dielectric Constant 1000 - 5000
Band Gap 3.2 eV

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of barium titanate are provided in the tables below:

Thermal Properties
Specific Heat Capacity 0.527 J/gk
Thermal Conductivity 6 W/mk
Mechanical Properties
Density 6.06 g/cm3
Melting Point 1625°C
Optical Properties
Refractive Index (@589 nm) 1.65

Safety Information

Safety Information
GHS Hazard Statements H302 - Harmful if swallowed
H332 - Harmful if inhaled.
Safety Phrases S28 - After contact with skin, wash immediately with plenty of soap and water.



 

Tell Us What You Think

Do you have a review, update or anything you would like to add to this article?

Leave your feedback
Submit