Neodymium oxalate, Nd₂(C₂O₄)₃

The system Nd2(C2O4)3 - Nd(NO3)3 - H2O at 25°. Solubility diagram.

Neodymium oxalate, Nd₂(C₂O₄)₃.10H₂O, is obtained by double decomposition as a pale rose-red crystalline powder. According to James and Robinson, the only stable hydrate in contact with water or aqueous neodymium nitrate at 25° has the composition Nd₂(C₂O₄)₃.11H₂O. The oxalate dissolves perceptibly in aqueous neodymium nitrate, and under certain conditions neodymium oxalonitrate Nd₂(C₂O₄)₃.4Nd(NO₃)₃.xH₂O or perhaps Nd₂(C₂O₄)₃.5Nd(NO₃)₃.xH₂O, is produced. The solubility curve for a temperature of 25° is shown in fig. The oxalate also dissolves in an aqueous solution of the chloride, and a neodymium oxalochloride exists.