Abstract
A new mixed valent manganese oxide, Na1.1Ca1.8Mn9O18, with a tunnel structure closely related to that of Na4Mn9O18 has been synthesized. It crystallizes in the Pnma space group with a=26.418(2) Å, b=5.6468(4) Å, and c=9.1384(8) Å. Its structural study, combining X-ray powder diffraction and electron microscopy, shows that the [Mn9O18]∞ framework is similar to that of Na4Mn9O18, forming large S-shaped and six-sided tunnels running along b. In contrast, the positions and distributions of calcium in the tunnels are different from those obtained for sodium in Na4Mn9O18, explaining the doubling of the periodicity along the tunnel axis direction. The insulating properties of these oxides agree with a tendency to ordering of the Mn3+ and Mn4+ species in different sites.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.