Characteristic

 

Holmium(III) oxide, or holmium oxide is a chemical compound of a rare-earth element holmium and oxygen with the formula Ho₂O₃. 

Chemical formula：Ho₂O₃

Molar mass： 377.858 g·mol−¹

Appearance： Pale yellow, opaque powder.

Density： 8.41 g cm⁻³

Melting point： 2,415 °C (4,379 °F; 2,688 K)

Boiling point： 3,900 °C (7,050 °F; 4,170 K)

Band gap： 5.3 eV 

Magnetic susceptibility (χ)：+88,100·10−6 cm³/mol

Refractive index (nD)：1.8 

Crystal structure：Cubic, cI80

Application

 

Holmium oxide is used in making specialty colored glasses. Glass containing holmium oxide and holmium oxide solutions have a series of sharp optical absorption peaks in the visible spectral range. They are therefore traditionally used as a convenient calibration standard for optical spectrophotometers.