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Journal Articles

Topotactic synthesis and crystal structure of a highly fluorinated Ruddlesden-Popper-type iron oxide, Sr$$_{3}$$Fe$$_{2}$$O$$_{5+x}$$F$$_{2-x}$$ (x $${approx}$$ 0.44)

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

Chemistry of Materials, 23(16), p.3652 - 3658, 2011/08

https://doi.org/10.1021/cm201075g
 Times Cited Count：26 Percentile：59.91(Chemistry, Physical)

Topotactic reaction of the Ruddlesden-Popper phase Sr$$_{3}$$Fe$$_{2}$$O$$_{7-delta}$$ ($$delta$$ $${approx}$$ 0.18) with polytetrafluoroethylene yields a highly fluorinated phase Sr$$_{3}$$Fe$$_{2}$$O$$_{5+x}$$F$$_{2-x}$$ (x $${approx}$$ 0.44), compared with Sr$$_{3}$$Fe$$_{2}$$O$$_{6}$$F$$_{0.87}$$ prepared by the reaction of Sr$$_{3}$$Fe$$_{2}$$O$$_{6}$$ and F$$_{2}$$ gas. Structure analyses based on powder neutron diffraction, synchrotron powder diffraction, and $$^{57}$$Fe M$"o$ssbauer spectroscopy measurements demonstrate that the new oxyfluoride perovskite has no anion deficiencies and adopts the tetragonal structure (space group ${it I}$4/${it mmm}$) with lattice constants ${it a}$ = 3.87264(6) ${AA}$ and ${it c}$ = 21.3465(6) ${AA}$ at room temperature. The fluoride ions preferentially occupy the terminal apical anion sites with oxide ions in a disordered manner, which results in square pyramidal coordination around iron.

Oral presentation

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*

no journal, , 

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 $$sim$$ 0.44). The crystal/magnetic structures and anion composition are determined by a combination of neutron diffraction and $$^{57}$$Fe M$"o$ssbauer 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.

Oral presentation

Hard X-ray magnetic circular dichroism study on the magnetic transition and multipole order in double perovskite-type oxide Ba$$_2$$CaOsO$$_6$$

Shibata, Goro; Hayashi, Hiroaki*; Kawamura, Naomi*; Okamoto, Jun*; Huang, D.-J.*; Streltsov, S.*; Yamaura, Kazunari*; Fujimori, Atsushi*

no journal, , 

no abstracts in English

Oral presentation

Exploration for multipole order in 5$$d$$-electron systems; X-ray magnetic circular dichroism study of Ba$$_2$$CaOsO$$_6$$

Shibata, Goro; Hayashi, Hiroaki*; Kawamura, Naomi*; Okamoto, Jun*; Huang, D. J.*; Tanaka, Arata*; Streltsov, S.*; Yamaura, Kazunari*; Fujimori, Atsushi*

no journal, , 

Oral presentation

Electronic structure of Ba$$_2$$CaOsO$$_6$$ as a candidate material for magnetic octupole studied by hard X-ray magnetic circular dichroism

Shibata, Goro; Okamoto, Jun*; Hayashi, Hiroaki*; Kawamura, Naomi*; Tanaka, Arata*; Yamaura, Kazunari*; Streltsov, S.*; Huang, D. J.*; Fujimori, Atsushi*

no journal, , 

no abstracts in English

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