Abstract
Samples of Ln 3Ba 2Mn 2Cu 2O 12± y , Ln=Sm, Eu, have been synthesized with non-absorbing isotopes and studied by high-resolution powder neutron diffraction. For Ln=Eu, the material was studied before and after annealing in oxygen. Results show that segregation of the manganese and copper between the layer sites is incomplete and that oxygen can also be incorporated between the CuO 5 square-based pyramids giving the overall composition Ln 3Ba 2Mn 2Cu 2O 12.1. Cation size mismatch on the A-type cation sites leads to a local distortion in the oxide sub-lattice in the MnO 6 octahedra and consideration of the A-site coordination geometries permits an understanding of the limited lanthanide range for which this structure forms. While the Ln and Ba cations are fully segregated the observed B cation disorder and additional inter-cuprate layer oxygen are likely to preclude observation of superconductivity in this family of materials.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
