Neodymium(III) carbonate
Neodymium(III) carbonate, also known as neodymium carbonate, is an inorganic compound with the chemical formula Nd2(CO3)3. While the anhydrous form is known, it is more commonly encountered as a hydrate, typically the octahydrate Nd2(CO3)3·8H2O.
Properties:
Neodymium(III) carbonate is a pale purple or pink solid, characteristic of many neodymium compounds. It is generally insoluble in water, similar to other rare earth carbonates. However, its solubility increases in acidic conditions due to the reaction of the carbonate ion with acids, forming soluble neodymium salts and releasing carbon dioxide. The hydrated form loses water upon heating.
Synthesis:
Neodymium(III) carbonate can be synthesized by reacting a soluble neodymium(III) salt, such as neodymium(III) chloride or neodymium(III) nitrate, with a soluble carbonate salt, like sodium carbonate or ammonium carbonate, in aqueous solution. This results in the precipitation of neodymium(III) carbonate. The precipitate can then be filtered, washed, and dried.
Uses:
Neodymium(III) carbonate serves as a precursor in the preparation of other neodymium compounds, such as neodymium oxide (Nd2O3) and neodymium fluoride (NdF3). This is achieved by heating the carbonate to decompose it into the oxide or reacting it with hydrofluoric acid to form the fluoride. Neodymium(III) carbonate can also be used in the production of neodymium metal and as a component in certain catalysts. Its unique optical properties contribute to its use in specialized glass and ceramic applications, although to a lesser extent than neodymium oxide.
Safety:
Like other rare earth compounds, neodymium(III) carbonate is considered to have low toxicity. However, appropriate handling procedures, including the use of gloves and eye protection, are recommended to avoid potential skin or eye irritation. Inhalation of dust should also be avoided.