Mohammed A. Substitution of rare earth elements for lead in the structure of apatite

Object - Substitution of rare earth elements for lead in the structure of apatite. The fim of the work - establish the limits of isomorphic substitutions jf rare earth elements for lead and the influence of substitutions upon crystal structure of the sodium lead apatite. Research methods - X-ray powder diffraction, X-ray analysis of powders, scanning electron microscopy with energy dispersive local analysis, infrared spectroscopy. The conformities of the boundary changing of the solid solutions, their dependtnce on the size of ions of rare earth elements and their electronic configuration, as well as the distribution of the atoms of rare earth elements at different positions of the crystal structure of apatite and changes in the interatomic distances have been established. Scope of Use - synthesis of new phosphors, catalysts, adsorbents, solid electrolytes with improved properties.