Strontium titanate

Strontium titanate is an oxide of strontium and titanium with the chemical formula Sr Ti O3. At room temperature, it is a centrosymmetric paraelectric material with a perovskite structure. At low temperatures it approaches a ferroelectric phase transition with a very large dielectric constant ~104 but remains paraelectric down to the lowest temperatures measured as a result of quantum fluctuations, making it a quantum paraelectric. It was long thought to be a wholly artificial material, until 1982 when its natural counterpart—discovered in Siberia and named tausonite—was recognised by the IMA. Tausonite remains an extremely rare mineral in nature, occurring as very tiny crystals. Its most important application has been in its synthesized form wherein it is occasionally encountered as a diamond simulant, in precision optics, in varistors, and in advanced ceramics.

Strontium titanate
Names
Other names
Strontium titanium oxide

Tausonite

STO
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.846
EC Number
  • 235-044-1
MeSH Strontium+titanium+oxide
UNII
  • InChI=1S/3O.Sr.Ti/q;2*-1;+2; Y
    Key: VEALVRVVWBQVSL-UHFFFAOYSA-N Y
  • InChI=1/3O.Sr.Ti/q;2*-1;+2;/rO3Ti.Sr/c1-4(2)3;/q-2;+2
    Key: VEALVRVVWBQVSL-VUHNDFTMAE
  • [Sr++].[O-][Ti]([O-])=O
  • [Sr+2].[O-][Ti]([O-])=O
Properties
SrTiO
3
Molar mass 183.49 g/mol
Appearance White, opaque crystals
Density 5.11 g/cm3
Melting point 2,080 °C (3,780 °F; 2,350 K)
insoluble
2.394
Structure
Cubic Perovskite
Pm3m, No. 221
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

The name tausonite was given in honour of Lev Vladimirovich Tauson (1917–1989), a Russian geochemist. Disused trade names for the synthetic product include strontium mesotitanate, Diagem, and Marvelite. This product is currently being marketed for its use in jewelry under the name Fabulite. Other than its type locality of the Murun Massif in the Sakha Republic, natural tausonite is also found in Cerro Sarambi, Concepción department, Paraguay; and along the Kotaki River of Honshū, Japan.

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