Phase equilibrium system of CsCl‐YCl3‐(9.5%)HCl‐H2O at T=298.15 K and its compounds

The equilibrium solubility of one CsCl‐YCl3‐H2O ternary section of CsCl‐YCl3‐9.5%HCl‐H2O quaternary system at T=298.15 K was investigated by the physico‐chemical analysis method and the corresponding phase diagram was plotted. The crystallization of two new double salts Cs4YCl7·10H2O (4:1 type) and Cs3Y2Cl9·14H2O (3:2 type) was successful and they were obtained from the complicated system directly. Both were identified and characterized by X‐ray, thermal analysis method of TG‐DTG, DSC. The fluorescence experiments show that up‐conversion phenomenon does not exist in compounds Cs4YCl7·10H2O and Cs3Y2Cl9·14H2O.