Barium titanate

Barium titanate
Identifiers
Polycrystalline BaTiO₃ in plastic
CAS Number	12047-27-7^Y
3D model (JSmol)	Interactive image
ChemSpider	10605734^Y
ECHA InfoCard	100.031.783
EC Number	234-975-0
PubChem CID	6101006
RTECS number	XR1437333
UNII	73LKE302QO^Y
CompTox Dashboard (EPA)	DTXSID20892161
InChI InChI=1S/2Ba.4O.Ti/q2+2;4-1;^Y Key: JRPBQTZRNDNNOP-UHFFFAOYSA-N^Y InChI=1/2Ba.4O.Ti/q2+2;4-1;/r2Ba.O4Ti/c;;1-5(2,3)4/q2*+2;-4 Key: JRPBQTZRNDNNOP-NXYSCRTKAD
SMILES [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-]
Properties
Chemical formula	BaTiO₃
Molar mass	233.192 g/mol
Appearance	White crystals
Odor	Odorless
Density	6.02 g/cm³, solid
Melting point	1,625 °C (2,957 °F; 1,898 K)
Solubility in water	Insoluble
Solubility	Slightly soluble in dilute mineral acids; dissolves in concentrated hydrofluoric acid
Band gap	3.2 eV (300 K, single crystal)
Refractive index (n_D)	n_o = 2.412; n_e = 2.360
Structure
Crystal structure	Tetragonal, tP5
Space group	P4mm, No. 99
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H302, H332
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is ^YN ?) Infobox references

Barium titanate (BTO) is an inorganic compound with chemical formula BaTiO₃. It is the barium salt of metatitanic acid. Barium titanate appears white as a powder and is transparent when prepared as large crystals. It is a ferroelectric, pyroelectric, and piezoelectric ceramic material that exhibits the photorefractive effect. It is used in capacitors, electromechanical transducers and nonlinear optics.