Synthesis, characterization and EPR investigation of γ-induced defects of nanoparticles of (MI, co3)-containing apatites (MI – Na, K)

The nanoparticles of (Na, CO ₃)- and (K, CO ₃)-containing Calcium phosphates have been prepared by a wet precipitation method in aqueous media. The influence of nature of alkaline metal and of samples composition on particles size and peculiars of their thermal transformation have been studied using such physical-chemical methods as FTIR, XRD, SEM and TPM MS analysis. Chemical composition of powders have been determined by ICP analysis and the degree of substitution of Calcium atoms by alkaline metals depends on CO ₃ ^2-/PO ₄ ^3- molar ratio in initial solutions. The differences in the formation of γ-induced defects in (Na, CO ₃)- and (K, CO ₃)- containing apatites have been found using EPR spectroscopy.