title: Ferrimagnetic Cage Framework in Ca12Fe10Si4O32Cl6.
abstract: The positively charged cage framework of the natural mineral mayenite, which enables various species with negative charge to be stabilized, is one of the key structures to provide the new functionalities exploited in applications. Here we report the structural and magnetic properties of recently found eltyubyuite, Ca12Fe10Si4O32Cl6, which is the first compound bearing a transition metal oxide as a main constituent in the mayenite-type structure. From neutron powder diffraction measurements at T = 20 K and the low temperature Mössbauer measurement, we determined the magnetic structure of eltyubyuite to be a ferrimagnet with oppositely aligned magnetic moments of +3.17(3) and -3.05(8) μBin two tetrahedral Fe sites with different oxygen ligands, all bridging oxygens or mixed bridging and nonbridging oxygens. As far as is known, this result is likely to be a first example showing ferrimagnetism stemming from only tetrahedral Fe3+ions. The reduced magnetic moment per Fe3+and the resultant small net moment per unit cell of 22 μBat μ0H = 5 T and T = 15 K are attributed to strong covalency in much shorter Fe-O bonds in the FeO4tetrahedra.
authors.forename: Soshi
authors.identifier: http://orcid.org/0000-0003-3270-155X
authors.initials: S
authors.lastname: Iimura
authors.forename: Yudai
authors.initials: Y
authors.lastname: Tomota
authors.forename: Satoru
authors.initials: S
authors.lastname: Matsuishi
authors.affiliation: Research Reactor Institute, Kyoto University , Kumatori, Osaka 590-0494, Japan.
authors.forename: Ryo
authors.initials: R
authors.lastname: Masuda
authors.affiliation: Research Reactor Institute, Kyoto University , Kumatori, Osaka 590-0494, Japan.
authors.forename: Makoto
authors.initials: M
authors.lastname: Seto
authors.affiliation: Graduate School of Science and Engineering, Ibaraki University , Mito, Ibaraki 310-8512, Japan.
authors.forename: Haruhiro
authors.initials: H
authors.lastname: Hiraka
authors.affiliation: Institute of Materials Structure Science, High Energy Accelerator Research Organization , Tsukuba 305-0801, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Ikeda
authors.affiliation: Institute of Materials Structure Science, High Energy Accelerator Research Organization , Tsukuba 305-0801, Japan.|Department of Materials Structure Science, The Graduate University for Advanced Studies (SOKENDAI) , Tokai, Ibaraki 319-1106, Japan.
authors.forename: Toshiya
authors.initials: T
authors.lastname: Otomo
authors.forename: Hideo
authors.initials: H
authors.lastname: Hosono