Calcium titanate is an

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemi ...

with the chemical formula Ca Ti O₃. As a mineral, it is called

perovskite Perovskite (pronunciation: ) is a calcium titanium oxide mineral composed of calcium titanate (chemical formula ). Its name is also applied to the class of compounds which have the same type of crystal structure In crystallography, crystal ...

, named after Russian mineralogist, L. A. Perovski (1792-1856). It is a colourless,

diamagnetic Diamagnetic materials are repelled by a magnetic field; an applied magnetic field creates an induced magnetic field in them in the opposite direction, causing a repulsive force. In contrast, paramagnetic and ferromagnetic materials are attracted ...

solid, although the mineral is often coloured owing to impurities.

Synthesis

CaTiO₃ can be prepared by the combination of

CaO Cao or CAO may refer to: Mythology *Cao (bull), a legendary bull in Meitei mythology Companies or organizations *Air China Cargo, ICAO airline designator CAO * CA Oradea, Romanian football club *CA Osasuna, Spanish football club * Canadian Asso ...

and TiO₂ at temperatures >1300 °C. Sol-gel processes has been used to make a more pure substance, as well as lowering the synthesis temperature. These compounds synthesized are more compressible due to the powders from the sol-gel process as well and bring it closer to its calculated density (~4.04 g/ml).

Structure

Calcium titanate is obtained as

orthorhombic In crystallography, the orthorhombic crystal system is one of the 7 crystal systems. Orthorhombic lattices result from stretching a cubic lattice along two of its orthogonal pairs by two different factors, resulting in a rectangular prism with ...

crystals, more specifically

perovskite structure A perovskite is any material with a crystal structure following the formula ABX3, which was first discovered as the mineral called perovskite, which consists of calcium titanium oxide (CaTiO3). The mineral was first discovered in the Ural m ...

. In this motif, the Ti(IV) centers are octahedral and the Ca²⁺ centers occupy a cage of 12 oxygen centres. Many useful materials adopt related structures, e.g.

barium titanate Barium titanate (BTO) is an inorganic compound with chemical formula BaTiO3. Barium titanate appears white as a powder and is transparent when prepared as large crystals. It is a ferroelectric, pyroelectric, and piezoelectric ceramic material th ...

or variations of the structure, e.g.

yttrium barium copper oxide Yttrium barium copper oxide (YBCO) is a family of crystalline chemical compounds that display high-temperature superconductivity; it includes the first material ever discovered to become superconducting above the boiling point of liquid nitrogen ( ...

Applications

Calcium titanate has relatively little value except as one of the ores of titanium, together with several others. It is reduced to give titanium metal or

ferrotitanium Ferrotitanium is a ferroalloy, an alloy of iron and titanium with between 10–20% iron and 45–75% titanium and sometimes a small amount of carbon. It is used in steelmaking as a cleansing agent for iron and steel; the titanium is highly reactive ...

alloys.

External links

Crystal structure of CaTiO₃

References

Calcium compounds Titanates Perovskites {{inorganic-compound-stub

Synthesis

Structure

Applications

See also

External links

References