Crystallization of PbxSr1-x(NO3)(2) solid solutions from aqueous solutions

A series of PbxPr1-x(NO3)(2) crystals have been grown from aqueous solution s and characterized by X-ray powder diffraction. All diffraction data were well indexed according to the simple cubic structure. The variation of latt ice constants with the concentrations of Pb2+ in the crystals accorded quit e well to the Vegard's Law. The composition of the Sr(NO,), crystal doped w ith Pb2+ was studied by electron microprobe and it was found that Pb2+ was enriched in the 111 sectors. Equilibrium behavior in the Pb(NO3)(2)-Sr(NO3) (2)-H2O system was analyzed by Lippmann's phase diagram and the equilibrium distribution coefficient D-ph = 133.6. This large value of D indicates tha t Pb2+ ion is preferentially distributed to the solid phase.