Topotactic synthesis and crystal structure of a fluorinated layered iron oxyfluoride

Tsujimoto, Yoshihiro*; Yamaura, Kazunari*; Matsushita, Yoshitaka*; Muromachi, Eiji*; Hayashi, Naoaki*; Kodama, Katsuaki ; Igawa, Naoki ; Shirako, Yuichi*; Akaogi, Masaki*

Topotactic reaction of the n = 2 Ruddlesden-Popper phase Sr $_{3}$ Fe $_{2}$ O $_{7-delta}$ with the Teflon polymer yields a highly fluorinated phase Sr $_{3}$ Fe $_{2}$ O $_{5+x}$ O $_{2-x}$ (x 0.44). The crystal/magnetic structures and anion composition are determined by a combination of neutron diffraction and $^{57}$ Fe Mssbauer spectroscopy experiments. Fluoride anions selectively occupy the terminal apical anion sites, leading to the square pyramidal coordination around the Fe metal center. The oxyfluoride material adopts a simple antiferromagnetic ordered structure with k = (1/2 1/2 0) below 390 K.

Language	:	Japanese
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Meeting title	:	日本セラミックス協会第25回秋季シンポジウム
Held date	:	2012/09
Location (city)	:	名古屋
Location (country)	:	日本
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Keywords	:	no keyword
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Cooperating Institute	:	物質・材料研究機構

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Registration No. : BB20121290
JAEA Abstracts No. :
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