title: Sr₂₁Bi₈Cu₂(CO₃)₂O₄₁, a Bi⁵⁺ oxycarbonate with an original 10L structure.
abstract: The layered structure of Sr21Bi8Cu2(CO3)2O41 (Z = 2) was determined by transmission electron microscopy, infrared spectroscopy, and powder X-ray diffraction refinement in space group P6₃/mcm (No. 194), with a = 10.0966(3)Å and c = 26.3762(5)Å. This original 10L-type structure is built from two structural blocks, namely, [Sr15Bi6Cu2(CO3)O29] and [Sr6Bi2(CO3)O12]. The Bi(5+) cations form [Bi2O10] dimers, whereas the Cu(2+) and C atoms occupy infinite tunnels running along c⃗. The nature of the different blocks and layers is discussed with regard to the existing hexagonal layered compounds. Sr21Bi8Cu2(CO3)2O41 is insulating and paramagnetic.
authors.affiliation: Laboratoire CRISMAT and ‡Laboratoire LCS, ENSICAEN-UCBN , 6 Bld Maréchal Juin, 14050 Caen, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Malo
authors.forename: Artem M
authors.initials: AM
authors.lastname: Abakumov
authors.forename: Marco
authors.initials: M
authors.lastname: Daturi
authors.forename: Denis
authors.initials: D
authors.lastname: Pelloquin
authors.forename: Gustaaf
authors.initials: G
authors.lastname: Van Tendeloo
authors.forename: Anne
authors.initials: A
authors.lastname: Guesdon
authors.forename: Maryvonne
authors.initials: M
authors.lastname: Hervieu