title: First experimental evidence of a new D4-AgCoO2 delafossite stacking.
abstract: A new polytype of AgCoO(2) delafossite has been prepared from the ordered OP4-(Li/Na)CoO(2) layered compound using ion-exchange reaction in molten salts. As expected from the structural model assuming a topotactic process, the lamellar structure of this new polytype is an alternate combination of the already known 2H and 3R delafossite polytypes. It crystallizes in the P6(3)/mmc space group with cell parameters a(hex.) = 2.871(1) Å and c(hex.) = 24.448(1) Å. Thermal stability, morphology characterization, and electrical properties are reported here and compared with those of the 2H and 3R AgCoO(2) polytypes.
authors.affiliation: CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 F-Pessac, France.
authors.forename: R
authors.initials: R
authors.lastname: Berthelot
authors.forename: M
authors.initials: M
authors.lastname: Pollet
authors.forename: J-P
authors.initials: JP
authors.lastname: Doumerc
authors.forename: C
authors.initials: C
authors.lastname: Delmas