research papers
The system of flexible composition Bi2(n + 2)MonO6(n + 1) is described within the superspace formalism with two models, depending on the parity of the parameter n.
research papers
Two commensurate members (m = 4, 5) of the 2212 stair-like family of compounds with the composition [Bi2Sr3Fe2O9]m[Bi4Sr6Fe2O16] have been analyzed and refined in the (3 + 1)-dimensional superspace framework. Both compounds are described by a unique model, including displacive modulations. The assumption of the validity of the proposed model for a range of compositions allows a realistic prediction of the structures of other members of the family.