2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
2021 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)
Sep 15 - Sep 19, 2021Online
[R2-07]Structural Analysis of ilvaite: distribution of Fe2+, Fe3+ and Mn2+.[Presentation award entry]
*Yutaro Inoue1, Toru Kawamata2, Takashi Mikouchi3, Kazumasa Sugiyama2(1. Eng. Tohoku Univ., 2. IMR Tohoku Univ., 3. The University Museum, The Univ. of Tokyo)
Keywords:
ilvaite,Single-crystal X-ray diffraction,Anomalous X-ray Scattering
Anomalous X-ray scattering (AXS) measurements were performed on the ilvaite sample from Smolyan (CaFe2+2Fe3+ Si2O7O(OH)), to determine the distribution of Mn, Fe2+ and Fe3+. Mn-AXS measurement revealed that Mn was selectively located at the Fe2 site and not at either of Fe11 and Fe12 sites. In addition, Fe-AXS measurement suggested that Fe2+ was randomly distributed in the Fe11 and Fe12 sites. The rather random distribution of Fe2+ among the Fe11 and Fe12 sites corresponds well with the lower σ value estimated by the averaged interatomic distances.