Bismuth titanate

Bi₂Ti₂O₇
Identifiers
CAS Number	12010-68-3 ; 12048-51-0; 11115-71-2;
3D model (JSmol)	Interactive image;
ChemSpider	145402 ;
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

Bi₄Ti₃O₁₂
	; Bi4Ti3O12 crystal structure
Names
	Other names Bismuth titanium oxide
Identifiers
CAS Number	12010-77-4 ;
3D model (JSmol)	Interactive image;
ChemSpider	10637934 ;
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
Solubility in water	insoluble
Band gap	3.5 eV
Structure
Crystal structure	Orthorhombic, oS76
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

Bi₁₂TiO₂₀
	; Bi12TiO20 crystal
	; Bi12TiO20 crystal structure
Names
	Other names Bismuth titanium oxide, dodecabismuth titanate
Identifiers
CAS Number	12441-73-5 ;
3D model (JSmol)	Interactive image;
ChemSpider	27472572 ;
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
Melting point	875 °C (1,607 °F; 1,148 K) Decomposes to Bi4Ti3O12 and Bi2O3
Solubility in water	insoluble
Structure
Crystal structure	body-centered cubic, cI66
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

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.

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]