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.

Bi₁₂TiO₂₀

Bi12TiO20 crystal[1]
Bi12TiO20 crystal structure[2]
Names
Other names Bismuth titanium oxide, dodecabismuth titanate[3]
Identifiers
CAS Number	12441-73-5 Y
3D model (JSmol)	Interactive image
ChemSpider	27472572 Y
PubChem CID	56846075
InChI InChI=1S/12Bi.20O.Ti Key: LIHXTGNDEGWZNF-UHFFFAOYSA-N
SMILES 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
Chemical formula	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]
Solubility in water	insoluble
Structure
Crystal structure	body-centered cubic, cI66[4][2]
Space group	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). Infobox references

Bi₄Ti₃O₁₂

Bi4Ti3O12 crystal structure[5]
Names
Other names Bismuth titanium oxide
Identifiers
CAS Number	12010-77-4 Y
3D model (JSmol)	Interactive image
ChemSpider	10637934 Y
EC Number	234-564-6
PubChem CID	138395175
InChI InChI=1S/4Bi.12O.3Ti/q4*+3;12*-2;3*+4 Key: LEVGIWAPKXUVTE-UHFFFAOYSA-N
SMILES [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
Chemical formula	Bi4Ti3O12
Molar mass	1171.5
Odor	odorless
Density	7.95 g/cm3[5]
Solubility in water	insoluble
Band gap	3.5 eV
Structure
Crystal structure	Orthorhombic, oS76[5]
Space group	Aba2, No. 41
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Bi₂Ti₂O₇

Identifiers
CAS Number	12010-68-3 Y 12048-51-0 11115-71-2
3D model (JSmol)	Interactive image
ChemSpider	145402 Y
EC Number	234-986-0
PubChem CID	165913
InChI InChI=1S/2Bi.7O.2Ti/q2*+3;7*-2;2*+4 Key: VDESGIACEFVDCZ-UHFFFAOYSA-N
SMILES [O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Ti+4].[Bi+3].[Bi+3]
Properties
Chemical formula	Bi2O7Ti2
Molar mass	625.688 g·mol−1
Odor	odorless
Solubility in water	insoluble
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

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

• Bismuth germanate
• Sillénite