Abstract
The distorted magnetoplumbite-type structure of BaFe 2.5Mn 9.5O 19 has been studied by powder neutron diffraction. The compound is orthorhombic, space group Cmcm ( a=5.826 Å, b=10.367 Å, c=23.004 Å, Z=4). Manganese is substituted into all five iron sites of the barium ferrite with population decreasing when going from the centre of the S block (100% of Mn for the 2a site) to the centre of the R block (40% for the 4e( 1 2 ) site). The structure includes two types of local Jahn-Teller distortions — the shortened Mn 3+O 6 octahedral in sites 4f IV and two thirds of sites 12k and the elongated octahedra in the remaining third. Manganese in the tetrahedral site 4f IV is bivalent and is compensated by Mn 4+ ions located preferentially in the octahedral site 2a. Ferrimagnetic arrangement below T c=220 K involves a large deal of static disorder. The ordered moments are aligned along the c-axis.
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.
