Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 601 - Abstract -

L. J. Wu, W. C. Chen, C. R. Li, Y. C. Liu, W. Y. Ma, J. K. Liang

Chinese Academy of Sciences, Beijing, P.R. China

Crystallization of PbxSr1-x(NO3)2 Solid Solutions from Aqueous Solutions

A series of PbxSr1-x(NO3)2 crystals have been grown from aqueous solutions and characterized by X-ray powder diffraction. All diffraction data were well indexed according to the simple cubic structure. The variation of lattice constants with the concentrations of Pb2+ in the crystals accorded quite well to the Vegard’s Law. The composition of the Sr(NO3)2 crystal doped with 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 DPb=133.6. This large value of D indicates that Pb2+ ion is preferentially distributed to the solid phase.

Keywords: crystallization, nitrate, solid solutions, activity-coefficients, phase diagram, compositional zoning


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