title: The novel arsenate Na4Co(7-x)Al(2/3x)(AsO4)6 (x = 1.37): crystal structure, charge-distribution and bond-valence-sum investigations.
authors.affiliation: Laboratoire de Matériaux et Cristallochimie, Faculté des Sciences, El Manar II, 2092 Tunis, Tunisia.
authors.forename: Riadh
authors.initials: R
authors.lastname: Marzouki
authors.forename: Abderrahmen
authors.initials: A
authors.lastname: Guesmi
authors.forename: Ahmed
authors.initials: A
authors.lastname: Driss