Rietveld refinements and vibrational spectroscopic studies of Na 1-xKxPb4(PO4)3 lacunar apatites (0≤x≤1)

M. Azrour, M. Azdouz, B. Manoun, Rachid Essehli, S. Benmokhtar, L. Bih, L. El Ammari, A. Ezzahi, A. Ider, A. Ait Hou

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Synthesis of apatites, Na1-xKxPb4(PO 4)3 0≤x≤1, with anion vacancy was carried out using solid state reactions. The solid solution of apatite-type structure crystallizes in the hexagonal system, space group P63/m (No 176). Rietveld refinements showed that 75% of Pb2 cations are located in the (6h) sites; the ninefold coordination sites (4f) are equally occupied by the other 25% lead cations and the K and Na monovalent ions. The structure can be described as built up from [PO4]3- tetrahedra and Pb 2 of sixfold coordination cavities (6h positions), which delimit void hexagonal tunnels running along [0 0 1]. These tunnels are connected by cations of mixed sites (4f) half occupied by Pb2 and half by Na/K mixed cations. The assignment of the observed frequencies in the Raman and infrared spectra is discussed on the basis of a unit cell group analysis and by comparison with other apatites. The Raman modes of all the compositions show some linear shifts of the frequencies as a function of the composition toward lower values due the substitutions of Na by K with a larger radius.

Original languageEnglish
Pages (from-to)1199-1205
Number of pages7
JournalJournal of Physics and Chemistry of Solids
Volume72
Issue number11
DOIs
Publication statusPublished - Nov 2011
Externally publishedYes

Fingerprint

Apatites
Rietveld refinement
Apatite
apatites
Cations
Positive ions
cations
tunnels
Tunnels
Chemical analysis
Solid state reactions
tetrahedrons
Vacancies
Anions
voids
Solid solutions
Substitution reactions
solid solutions
Negative ions
infrared spectra

Keywords

  • C. Raman and infrared spectroscopies
  • C. X-ray diffraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)

Cite this

Rietveld refinements and vibrational spectroscopic studies of Na 1-xKxPb4(PO4)3 lacunar apatites (0≤x≤1). / Azrour, M.; Azdouz, M.; Manoun, B.; Essehli, Rachid; Benmokhtar, S.; Bih, L.; El Ammari, L.; Ezzahi, A.; Ider, A.; Hou, A. Ait.

In: Journal of Physics and Chemistry of Solids, Vol. 72, No. 11, 11.2011, p. 1199-1205.

Research output: Contribution to journalArticle

Azrour, M, Azdouz, M, Manoun, B, Essehli, R, Benmokhtar, S, Bih, L, El Ammari, L, Ezzahi, A, Ider, A & Hou, AA 2011, 'Rietveld refinements and vibrational spectroscopic studies of Na 1-xKxPb4(PO4)3 lacunar apatites (0≤x≤1)', Journal of Physics and Chemistry of Solids, vol. 72, no. 11, pp. 1199-1205. https://doi.org/10.1016/j.jpcs.2011.06.013
Azrour, M. ; Azdouz, M. ; Manoun, B. ; Essehli, Rachid ; Benmokhtar, S. ; Bih, L. ; El Ammari, L. ; Ezzahi, A. ; Ider, A. ; Hou, A. Ait. / Rietveld refinements and vibrational spectroscopic studies of Na 1-xKxPb4(PO4)3 lacunar apatites (0≤x≤1). In: Journal of Physics and Chemistry of Solids. 2011 ; Vol. 72, No. 11. pp. 1199-1205.
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