Holmium(III) oxide

Holmium(III) oxide
Names
	IUPAC name Holmium(III) oxide
	Other names Holmium oxide; Holmia;
Identifiers
CAS Number	12055-62-8 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	3441223 ;
ECHA InfoCard	100.031.820
EC Number	235-015-3;
PubChem CID	4232365;
UNII	6A1MAM6A4J ;
CompTox Dashboard (EPA)	DTXSID30894772 ;
	InChI InChI=1S/2Ho.3O Key: JYTUFVYWTIKZGR-UHFFFAOYSA-N ; InChI=1/2Ho.3O/rHo2O3/c3-1-5-2-4 Key: JYTUFVYWTIKZGR-VLHOCPAZAL;
	SMILES [O][Ho]O[Ho][O]; O=[Ho]O[Ho]=O;
Properties
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
Structure
Crystal structure	Cubic, cI80
Space group	Ia-3, No. 206
Thermochemistry
Heat capacity (C)	115.0 J mol−1 K−1
Std molar; entropy (S⦵298)	158.2 J mol−1 K−1
Std enthalpy of; formation (ΔfH⦵298)	−1880.7 kJ mol−1
Hazards
	GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H319, H410
Precautionary statements	P264, P273, P280, P305+P351+P338, P337+P313, P391, P501
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Holmium(III) chloride
Other cations	Dysprosium(III) oxide; Erbium(III) oxide;
Related compounds	Bismuth(III) oxide; Europium(III) oxide; Gold(III) oxide; Lanthanum(III) oxide; Lutetium(III) oxide; Praseodymium(III) oxide; Promethium(III) oxide; Terbium(III) oxide; Thallium(III) oxide; Thulium(III) oxide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Holmium(III) oxide, or holmium oxide is a chemical compound of the rare-earth element holmium and oxygen with the formula Ho₂O₃. Together with dysprosium(III) oxide (Dy₂O₃), holmium oxide is one of the most powerfully paramagnetic substances known. The oxide, also called holmia, occurs as a component of the related erbium oxide mineral called erbia. Typically, the oxides of the trivalent lanthanides coexist in nature, and separation of these components requires specialized methods. 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.