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Names | |
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IUPAC name
Holmium(III) oxide
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Other names
Holmium oxide, Holmia
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Identifiers | |
3D model (JSmol)
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ChemSpider | |
ECHA InfoCard | 100.031.820 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
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 [1] |
+88,100·10−6 cm3/mol | |
Refractive index (nD)
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1.8 [1] |
Structure | |
Cubic, cI80 | |
Ia-3, No. 206 | |
Thermochemistry | |
Heat capacity (C)
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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: | |
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Warning | |
H319, H410 | |
P264, P273, P280, P305+P351+P338, P337+P313, P391, P501 | |
Safety data sheet (SDS) | External MSDS |
Related compounds | |
Other anions
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Holmium(III) chloride |
Other cations
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Dysprosium(III) oxide Erbium(III) oxide |
Related compounds
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Bismuth(III) oxide Europium(III) oxide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.
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