Calcium titanate

This article is about the chemical. For the mineral, see Perovskite.

Calcium titanate

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Identifiers
CAS Number	12049-50-2 Y
ChemSpider	17340234 Y
Jmol 3D model	Interactive image
PubChem	16212381
RTECS number	XR2568666
InChI InChI=1S/Ca.3O.Ti/q+2;;2*-1; Y Key: AOWKSNWVBZGMTJ-UHFFFAOYSA-N Y InChI=1/Ca.3O.Ti/q+2;;2*-1;/rCa.O3Ti/c;1-4(2)3/q+2;-2 Key: AOWKSNWVBZGMTJ-SLQOSCGQAQ
SMILES [Ca+2].[O-][Ti]([O-])=O
Properties
Chemical formula	CaTiO3
Molar mass	135.943 g/mol
Appearance	white powder
Density	3.98 g/cm3
Melting point	1,975 °C (3,587 °F; 2,248 K)
Boiling point	3,000 °C (5,430 °F; 3,270 K)
Solubility in water	insoluble
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Calcium titanate, also known as calcium titanium oxide, is an inorganic compound with the chemical formula CaTiO₃. As a mineral, it is called perovskite, named after Russian mineralogist, L. A. Perovski (1792-1856). It is a colourless, diamagnetic solid, although the mineral is often coloured owing to impurities.

Synthesis

CaTiO₃ can be prepared by the combination of CaO 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

Main article: Perovskite (structure)

Calcium titanate is obtained as orthorhombic crystals, more specifically perovskite structure. 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 or variations of the structure, e.g. yttrium barium copper oxide.

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 alloys.

See also

• Perovskite
• Perovskite (structure)
• Perovskite solar cell

External links

• Crystal structure of CaTiO₃