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Bismuth titanate

Chemical compound From Wikipedia, the free encyclopedia

Bismuth titanate

Bismuth titanate or bismuth titanium oxide is a solid inorganic compound of bismuth, titanium and oxygen with the chemical formula of Bi12TiO20, Bi 4Ti3O12 or Bi2Ti2O7.

Quick Facts Names, Identifiers ...
Bi12TiO20
Thumb
Bi12TiO20 crystal[1]
Thumb
Bi12TiO20 crystal structure[2]
Names
Other names
Bismuth titanium oxide, dodecabismuth titanate[3]
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/12Bi.20O.Ti
    Key: LIHXTGNDEGWZNF-UHFFFAOYSA-N
  • O=[Ti]=O.O=[Bi]O[Bi]=O.O=[Bi]O[Bi]=O.O=[Bi]O[Bi]=O.O=[Bi]O[Bi]=O.O=[Bi]O[Bi]=O.O=[Bi]O[Bi]=O
Properties
Bi12TiO20
Molar mass 2875.62
Odor odorless
Density 9.03 g/cm3[2]
Melting point 875 °C (1,607 °F; 1,148 K) Decomposes to Bi4Ti3O12 and Bi2O3[4]
insoluble
Structure
body-centered cubic, cI66[4][2]
I23, No. 197
Related compounds
Other cations
 Bismuth silicon oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Quick Facts Names, Identifiers ...
Bi4Ti3O12
Thumb
Bi4Ti3O12 crystal structure[5]
Names
Other names
Bismuth titanium oxide
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 234-564-6
  • InChI=1S/4Bi.12O.3Ti/q4*+3;12*-2;3*+4
    Key: LEVGIWAPKXUVTE-UHFFFAOYSA-N
  • [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Ti+4].[Ti+4].[Bi+3].[Bi+3].[Bi+3].[Bi+3]
Properties
Bi4Ti3O12
Molar mass 1171.5
Odor odorless
Density 7.95 g/cm3[5]
insoluble
Band gap 3.5 eV
Structure
Orthorhombic, oS76[5]
Aba2, No. 41
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Quick Facts Identifiers, Properties ...
Bi2Ti2O7
Identifiers
3D model (JSmol)
ChemSpider
EC Number
  • 234-986-0
  • InChI=1S/2Bi.7O.2Ti/q2*+3;7*-2;2*+4
    Key: VDESGIACEFVDCZ-UHFFFAOYSA-N
  • [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Ti+4].[Bi+3].[Bi+3]
Properties
Bi2O7Ti2
Molar mass 625.688 g·mol−1
Odor odorless
insoluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Synthesis

Bismuth titanate ceramics can be produced by heating a mixture of bismuth and titanium oxides. Bi12TiO20 forms at 730–850 °C, and melts when the temperature is raised above 875 °C, decomposing in the melt to Bi4Ti3O12 and Bi2O3.[4] Millimeter-sized single crystals of Bi12TiO20 can be grown by the Czochralski process, from the molten phase at 880–900 °C.[1]

Properties and applications

Bismuth titanates exhibit electrooptical effect and photorefractive effect, that is, a reversible change in the refractive index under applied electric field or illumination, respectively. Consequently, they have potential applications in reversible recording media for real-time holography or image processing applications.[4][1]

See also

References

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