Elaboration, Rietveld refinements and vibrational spectroscopic study of Na 1− x K x CaPb 3 (PO 4 ) 3 lacunar apatites (0 ⩽ x ⩽ 1)

Structure and luminescence properties of La6Ba4(SiO4)6F2:Dy3+ phosphor with apatite structure

“…[24][25][26] By isomorphic substitution, the A site can be occupied by rare earth ions like Y 3+ , La 3+ , Gd 3+ or alkali metal ions like Li + , Na + , K + . [27][28][29] Accordingly, we can skillfully design novel Dy 3+ -doped phosphors with more accomplished light output for solid state lighting applications.…”

Elaboration, Rietveld Refinements and Vibrational Spectroscopic Studies of a new Lacunar Apatite Series: NaPb3-x CaxCd(PO4)3 (0 ≤ × ≤ 1)

“…176) and the atomic positions of the lacunar apatitic structure NaCaPb 3 (PO 4 ) 3 were used as starting sets in the refinement procedure for the samples NaPb 3-x Ca x Cd(PO 4 ) 3 (0 ≤ x ≤ 1). 22 A five-order polynomial was employed to assimilate the background while the peaks were fitted by using a pseudo-Voigt function. The half width of the diffraction peaks as a function of 2θ was evaluated by the Caglioti equation.…”

Synthetic Phase with the Structure of Apatite

“…Pb 2+ on plays a crucial role allowing to preserve the ideal apatitic network. This role is related to the presence of lone 6s 2 pairs (Section 2.1.2) which can compensate for the Coulomb imbalance due to the existence of anion gaps in the tunnels of apatites [198], [199]. [199].…”

“…Moreover a new voltammetric sensor for the quantification of mercury based on NaCaPb 3 (PO 4 ) 3 modified carbon paste electrode can be prepared. Because of the importance of these types of lacunar apatites and the problems which they may cause in biomaterial applications, particular attention has been paid during past few years to synthesize new lacunar anionic apatites [198], [199]. ii.…”

“…The tunnels are connected by cations of mixed sites (4f) half occupied by Pb 2+ and half by Na + /K + mixed alkali cations.The factor group analysis of the hexagonal structure (P6 3 /M) shows that the normal modes of vibration can be classified among the irreducible representations of C 6h by Eq. 56 where the internal mode contribution of (PO 4 ) groups to the IR and Raman-active vibrations is[199]:…”