Solubility in the NdCl3-LnCl3-HCl-H2O systems (Ln = Sm, Gd) at 25°C

The solubility at 25°C in the NdCl3-SmCl3-HCl-H2O and NdCl3-GdCl3-HCl-H2O quaternary water-salt systems has been studied in 40% hydrochloric acid sections. The NdCl3-SmCl3-HCl-H2O system represents a continuous series of solid solutions (type I solid solutions). The NdCl3-GdCl3-HCl-H2O system is a system with peritonic discontinuity (type V solid solutions). The discontinuity point of the peritonic solution has the following composition (wt %): NdCl3 · 6H2O, 1.13; GdCl3 · 6H2O, 0.11; HCl, 39.5; H2O, 59.26.