Barium titanate

Barium titanate
Barium titanate ceramics in plastic package
Polycrystalline BaTiO3 in plastic
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.783 Edit this at Wikidata
EC Number
  • 234-975-0
RTECS number
  • XR1437333
UNII
  • InChI=1S/2Ba.4O.Ti/q2*+2;4*-1; checkY
    Key: JRPBQTZRNDNNOP-UHFFFAOYSA-N checkY
  • InChI=1/2Ba.4O.Ti/q2*+2;4*-1;/r2Ba.O4Ti/c;;1-5(2,3)4/q2*+2;-4
    Key: JRPBQTZRNDNNOP-NXYSCRTKAD
  • [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-]
Properties
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)
Insoluble
Solubility Slightly soluble in dilute mineral acids; dissolves in concentrated hydrofluoric acid
Band gap 3.2 eV (300 K, single crystal)[1]
no = 2.412; ne = 2.360[2]
Structure
Tetragonal, tP5
P4mm, No. 99
Hazards
GHS labelling:
GHS07: Exclamation mark
Warning
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 checkY☒N ?)

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.

  1. ^ Suzuki, Keigo; Kijima, Kazunori (2005). "Optical Band Gap of Barium Titanate Nanoparticles Prepared by RF-plasma Chemical Vapor Deposition". Jpn. J. Appl. Phys. 44 (4A): 2081–2082. Bibcode:2005JaJAP..44.2081S. doi:10.1143/JJAP.44.2081. S2CID 122166759.
  2. ^ Tong, Xingcun Colin (2013). Advanced Materials for Integrated Optical Waveguides. Springer Science & Business Media. p. 357. ISBN 978-3-319-01550-7.