ChemicalBook > Product Catalog > Inorganic chemistry > Inorganic salts > Rare Earth Metals Oxides > Neodymium oxide
Neodymium oxide Chemical Properties
- Melting point:2270 °C
- Density 7.24 g/mL at 20 °C(lit.)
- storage temp. no restrictions.
- form Sintered Lump
- Specific Gravity7.24
- color Yellow
- Water Solubility insoluble
- Merck 14,6450
- CAS DataBase Reference1313-97-9(CAS DataBase Reference)
- EPA Substance Registry SystemNeodymium oxide (Nd2O3) (1313-97-9)
Neodymium oxide Usage And Synthesis
- Chemical Propertiespure material is a blue powder(s); technical material has a brown color; hygroscopic; absorbs atmospheric CO2; hexagonal; has slightly red fluorescence; used in ceramic capacitors, in coloring glass, and in television tubes, and as an evaporated material of 99.9% purity, it is possibly reactive to radio frequencies [HAW93] [MER06] [CER91]
- Physical propertiesBlue powder; hexagonal crystals; fluoresces red; density 7.24 g/cm3; melts around 1,900°C; practically insoluble in water, 30 mg/L at 75°C; dissolves in acids.
- UsesNeodymium oxide (Nd2O3) is a light-blue powder used to color glass and as a pigment for ceramics. It is also used to make color TV tubes.
- Uses(65%) To counteract color of iron in glass. (Purified grade) Ceramic capacitors, coloring glass, refractories, carbon arc-light electrodes, color TV tubes, dehydrogenation catalyst
- Production MethodsNeodymium oxide is produced from the two principal rare earth minerals, monazite, and bastnasite. The oxide is obtained as an intermediate in the recovery of neodymium metal (See Neodymium).
The oxide also may be formed by thermal dissociation of neodymium oxalate, hydroxide or carbonate:
Nd2(C2O4)3 → Nd2O3 + 6CO2
2Nd(OH)3 → Nd2O3 + 3H2O
Nd2(CO3)3 → Nd2O3 + 3CO2.
- ReactionsThe anhydrous oxide absorbs moisture from the air at ambient temperatures forming hydrated oxide. The oxide also absorbs carbon dioxide from air, forming neodymium carbonate.
Neodymium oxide dissolves in strong mineral acids forming corresponding neodymium salts:
Nd2O3 + 3H2SO4 → Nd2(SO4)3 + 3H2O
Reactions with acetic and other organic acids produce corresponding salts. When heated with ammonium chloride at 300 to 400°C, the oxide converts to chloride liberating ammonia and water:
Nd2O3 + 6NH4Cl → 2NdCl3 + 6NH3 + 3H2O
When heated with hydrogen fluoride, the product is neodymium fluoride:
Nd2O3 + 6HF → 2NdF3 + 3H2O
The oxide is reduced to neodymium metal when heated with hydrogen, carbon monoxide, or other reducing agents.
- Safety ProfileLow toxicity by ingestion.
- Purification MethodsDissolve it in HClO4, precipitate it as the oxalate with doubly recrystallised oxalic acid, wash it free of soluble impurities, dry it at room temperature and ignite it in a platinum crucible at higher than 850o in a stream of oxygen. It is a blue powder. [Tobias & Garrett J Am Chem Soc 80 3532 1958.]
Neodymium oxide Preparation Products And Raw materials
- Silver oxide RHENIUM(IV) OXIDE Digold trioxide Platinum(IV) oxide Cyclohexene oxide Zinc oxide Zirconium dioxide Tungsten trioxide Cerium dioxide Samarium oxide Tricobalt tetraoxide Cupric oxide Lanthanum oxide Gadolinium oxide Tetraterbium heptaoxide Titanium dioxide Tantalum pentoxide Palladium(II) oxide
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