Solubility of free and associated strontium in NaCl crystals

The solubility of free and associated strontium in NaCl crystals is investigated by the method of electrical conductivity and ionic thermoconductivity (I.T.C.). The solubility of free strontium in NaCl is rather low, the enthalpy of solution is $\text{h}{}_{\mathrm{d}}{}^{\mathrm{<mtext>f.i.</mtext>}}\text{2}\text{= 0.904}\text{eV}$. The dissolution of segregated strontium in the NaCl lattice is a two-stage process: in the first stage (290–530 K) there are present the isolated I.V. dipoles (peak at 226 K) and Suzuki phase inclusions (peak at 233 K); at ageing temperatures over ～ 530 K there takes place the thermal decomposition of Suzuki phase inclusions: this is the second stage. The solubility of associated strontium is characterized by the energy of solution 0.49 ± 0.03 eV. The reorientation of I.V. dipoles is described by the relaxation mode with τ₀ ～ 10^?13 sec and the enthalpy of 0.66 ± 0.02 eV.