title: Lead bismuth calcium sodium phosphate: Pb4.6Bi0.4Ca2.6Na2.4(PO4)6.
abstract: The title compound, lead bismuth calcium sodium phosphate, Pb(4.6)Bi(0.4)Ca(2.6)Na(2.4)(PO(4))(6) crystallizes in the apatite structure type, with vacancies in sites 2a or 2b that are normally occupied by anions. The fact that the Bi and Pb ions are mainly localized in the 6h sites confirms the electron lone-pair influence on the apatite structure.
authors.affiliation: Laboratoire de Sciences de Matériaux et d'Environnement, Faculté des Sciences de SFAX, BP 802, 3018 SFAX, Tunisia.
authors.forename: Besma
authors.initials: B
authors.lastname: Hamdi
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Savariault
authors.forename: Hafed
authors.initials: H
authors.lastname: El-Feki
authors.forename: Abdelhamid
authors.initials: A
authors.lastname: Ben Salah