Fe-site substitution effect on the structural and magnetic properties in SrFeO2

Year: 2011 DOI: https://pubs.acs.org/doi/10.1021/ic102467u

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Liis Seinberg, Takafumi Yamamoto, Cédric Tassel, Yoji Kobayashi, Naoaki Hayashi, Atsushi Kitada, Yuji Sumida, Takashi Watanabe, Masakazu Nishi, Kenji Ohoyama, Kazuyoshi Yoshimura, Mikio Takano, Werner Paulus, Hiroshi Kageyama.   Inorganic Chemistry, 2011, 50, 3988-3995.


We investigated the Fe-site substitution effect on the structural and magnetic properties of the infinite layer iron oxide Sr(Fe(1-x)M(x))O(2) (M = Co, Mn) using synchrotron X-ray diffraction, neutron diffraction, and (57)Fe Mossbauer spectroscopy. Both systems have a similar solubility limit of x ~ 0.3, retaining the ideal infinite layer structure with a space group of P4/mmm. For the Fe-Co system, both in-plane and out-of-plane axes decrease linearly and only slightly with x, reflecting the ionic radius difference between Fe(2+) and Co(2+). For the Fe-Mn system the lattice evolution also follows Vegard's law but is anisotropic: the in-plane axis increases, while the out-of-plane decreases prominently. The magnetic properties are little influenced by Co substitution. On the contrary, Mn substitution drastically destabilizes the G-type magnetic order, featured by a significant reduction and a large distribution of the hyperfine field in the Mossbauer spectra, which suggests the presence of magnetic frustration induced presumably by a ferromagnetic out-of-plane Mn-Fe interaction.[on SciFinder (R)]