Everything about Barium Titanate totally explained
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Barium titanate is an
oxide of
barium and
titanium with the
chemical formula BaTiO
3. It is a
ferroelectric ceramic material, with a
photorefractive effect and
piezoelectric properties. It has five phases as a solid, listing from high temperature to low temperature:
hexagonal,
cubic,
tetragonal,
orthorhombic, and
rhombohedral crystal structure. All of the structures exhibit the
ferroelectric effect except cubic.
Appearance
It has the appearance of a white powder or transparent crystals. It is insoluble in water and soluble in concentrated
sulfuric acid. Its risk and safety phrases are, A,, and .
Manufacture
Barium titanate can be manufactured by liquid phase
sintering of
barium carbonate and
titanium dioxide, optionally with other materials for
doping.
High purity barium titanate powder is reported to be a key component of new barium titanate capacitor energy storage systems being developed by
EEStor for use in electric vehicles.
Barium titanate is often mixed with
strontium titanate.
Uses
Barium titanate is used as a
dielectric material for ceramic
capacitors, and as a piezoelectric material for
microphones and other
transducers. As a piezoelectric material, it was largely replaced by
lead zirconate titanate, also known as PZT.
Polycrystalline barium titanate displays positive
temperature coefficient, making it a useful material for
thermistors and self-regulating electric heating systems.
Fully-dense nanocrystalline barium titanate has 40% higher
permittivity than the same material prepared in classic ways.
Barium titanate crystals find use in
nonlinear optics. The material has high beam-coupling gain, and can be operated at visible and near-infrared wavelengths. It has the highest reflectivity of the materials used for
self-pumped phase conjugation (SPPC) applications. It can be used for continuous-wave
four-wave mixing with milliwatt-range optical power. For photorefractive applications, barium titanate can be doped by various other elements, for example
cerium.
The addition of inclusions of barium titanate to
tin has been shown to create a bulk material with a higher viscoelastic
stiffness than that of diamonds. Barium titanate goes through two phase transitions that change the crystal shape and volume. This leads to composites where the barium titanates have a negative bulk modulus (
Young's modulus), meaning that when a force acts on the inclusions, there's displacement in the opposite direction, further stiffening the composite.
Thin films of barium titanate display
electrooptic modulation to frequencies over 40 GHz.
The pyroelectric and ferroelectric properties of barium titanate are used in some types of uncooled sensors for
thermal cameras.
Further Information
Get more info on 'Barium Titanate'.
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