Lanthanum oxide, also known as lanthana, chemical formula La2O3, is an inorganic compound containing the rare earth element lanthanum and oxygen.
Molar mass： 325.809 g/mol
Appearance： White powder, hygroscopic
Density 6.51 g/cm3, solid
Melting point： 2,315 °C (4,199 °F; 2,588 K)
Boiling point： 4,200 °C (7,590 °F; 4,470 K)
Solubility in water：Insoluble
Band gap： 4.3 eV
Magnetic susceptibility (χ)：−78.0·10−6 cm3/mol
Crystal structure：Hexagonal, hP5
It is used in some ferroelectric materials, as a component of optical materials, and is a feedstock for certain catalysts, among other uses.