Neodymium(III) oxide
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Names | |
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IUPAC name
Neodymium(III) oxide
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Other names
Neodymium oxide, Neodymium sesquioxide
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Identifiers | |
1313-97-9 | |
Properties | |
Nd2O3 | |
Molar mass | 336.48 g/mol |
Appearance | light bluish gray hexagonal crystals |
Density | 7.24 g/cm3 |
Melting point | 2,233 °C (4,051 °F; 2,506 K) |
Boiling point | 3,760 °C (6,800 °F; 4,030 K)[1] |
.0003 g/100 mL (75 °C) | |
Structure | |
Hexagonal, hP5 | |
P-3m1, No. 164 | |
Thermochemistry | |
111.3 J·mol−1·K−1[1] | |
Std molar
entropy (S |
158.6 J·mol−1·K−1 |
Std enthalpy of
formation (ΔfH |
-1807.9 kJ·mol−1 |
Vapor pressure | {{{value}}} |
Related compounds | |
Other anions
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Neodymium(II) chloride Neodymium(III) chloride |
Other cations
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Uranium(VI) oxide Praseodymium(III) oxide Promethium(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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verify (what is ?) | |
Infobox references | |
Neodymium(III) oxide or neodymium sesquioxide is the chemical compound composed of neodymium and oxygen with the formula Nd2O3. It forms very light grayish-blue hexagonal crystals.[1] The rare earth mixture didymium, previously believed to be an element, partially consists of neodymium(III) oxide.[2]
Uses
Neodymium(III) oxide is used to dope glass, including sunglasses, to make solid-state lasers, and to color glasses and enamels.[3] Neodymium-doped glass turns purple due to the absorbance of yellow and green light, and is used in welding goggles.[4] Some neodymium-doped glass is dichroic; that is, it changes color depending on the lighting. One kind of glass named for the mineral alexandrite appears blue in sunlight and red in artificial light.[5] About 7000 tonnes of neodymium(III) oxide are produced worldwide each year. Neodymium(III) oxide is also used as a polymerization catalyst.[4]
Reactions
Neodymium(III) oxide is formed when neodymium(III) nitride or neodymium(III) hydroxide is burned in air.[6]
References
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