Comparison of lead solubility in NaCl crystals from data obtained by different methods

Abstract

The solvus of the NaCl: Pb2+ system was found in the concentration range from 1.5 × 10−3 to 1.9 × 10−2 mol% at temperatures ranging from 375 to 430 °C from the data of flotation measurements of the crystal density. The heat of impurity dissolution equal to 2.0 ± ± 0.6 eV and the change in the vibrational entropy in the formation of the solid solution Sv/K= 20 ± 10 were determined. Reasons for a difference in the estimates of lead solubility in NaCl, obtained from temperature dependences of light scattering and by other methods: measurement of the density, electric conductivity, and the electron‐microscopic decoration of the same crystals are discussed.