solid solution

New Solid-Solutions of Substitution Strontium (Sr) for Lead (Pb) in Apatite Structure

Strontium substitution for lead in $\mathrm{Pb}_{(8-x)} \mathrm{Sr}_x \mathrm{Na}_2\left(\mathrm{PO}_4\right)_6$ was analyzed using XRD, SEM, and Rietveld refinement techniques. All samples were synthesized using ceramic and semi-ceramic technologies. Pure apatite was formed in the composition from $x=0.00$ up to $x=2.75$. The results indicate that the samples’ collected compositions agree with the values calculated.

Point Defects and Physico-Chemical Properties of Crystals in Pb-Bi-Te System

Within crystalquasichemical formalism models of point defects of crystals in the Pb-Bi-Te system have been specified considering the amphoteric action of impurities in bismuth doped lead telluride PbTe:Bi, and solid solution formation mechanisms for РbТе-ВіТе and РbТе-Ві2Те3 have been examined. Dependences of Hall concentration and the concentration of point defects on the composition and the initial deviation from stoichiometry in the basic matrix have been calculated.