• Inner Mongolia rare earth oxide HO2O3 holmium oxide

Holmium(III) oxide, or holmium oxide is a chemical compound of a rare-earth element holmium and oxygen with the formula HO2O3. Together with dysprosium(III) oxide (Dy2O3), holmium oxide is known as one of the most powerfully paramagnetic substances. 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.

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
Application Used in making specialty colored glasses
Crystal structure Cubic, cI80
Space group Ia-3, No. 206

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