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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
Times Cited Count:26 Percentile:59.91(Chemistry, Physical)Topotactic reaction of the Ruddlesden-Popper phase SrFeO ( 0.18) with polytetrafluoroethylene yields a highly fluorinated phase SrFeOF (x 0.44), compared with SrFeOF prepared by the reaction of SrFeO and F gas. Structure analyses based on powder neutron diffraction, synchrotron powder diffraction, and Fe Mssbauer spectroscopy measurements demonstrate that the new oxyfluoride perovskite has no anion deficiencies and adopts the tetragonal structure (space group 4/) with lattice constants = 3.87264(6) and = 21.3465(6) 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.
Belik, A. A.*; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Kosuda, Kosuke*; Muromachi, Eiji*
Journal of the American Chemical Society, 132(23), p.8137 - 8144, 2010/05
Times Cited Count:49 Percentile:74.59(Chemistry, Multidisciplinary)Kodama, Katsuaki; Iikubo, Satoshi; Shamoto, Shinichi; Belik, A. A.*; Muromachi, Eiji*
Journal of the Physical Society of Japan, 76(12), p.124605_1 - 124605_7, 2007/12
Times Cited Count:23 Percentile:71.06(Physics, Multidisciplinary)Belik, A. A.*; Iikubo, Satoshi; Yokosawa, Tadahiro*; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Azuma, Masaki*; Takano, Mikio*; Kimoto, Koji*; Matsui, Yoshio*; et al.
Journal of the American Chemical Society, 129(4), p.971 - 977, 2007/01
Times Cited Count:182 Percentile:95.3(Chemistry, Multidisciplinary)Structural properties of polycrystalline single-phased BiMnO samples prepared at 6 GPa and 1383 K have been studied by selected area electron diffraction (SAED), convergent beam electron diffraction (CBED), and the Rietveld method using neutron diffraction data measured at 300 and 550 K. The SAED and CBED data showed that BiMnO crystallizes in the centrosymmetric space group C2/c at 300 K. The analysis of Mn-O bond lengths suggested that the orbital order present in BiMnO at 300 K melts above T= 474 K. The phase transition at 474 K is of the first order and accompanied by a jump of magnetization and small changes of the effective magnetic moment and Weiss temperature.
Higemoto, Wataru; Oishi, Kazuki; Koda, Akihiro*; Kadono, Ryosuke*; Sakurai, Hiroya*; Takada, Kazunori*; Muromachi, Eiji*; Sasaki, Takayoshi*
Physica B; Condensed Matter, 374-375, p.274 - 277, 2006/03
Times Cited Count:6 Percentile:31.23(Physics, Condensed Matter)no abstracts in English
Belik, A. A.*; Iikubo, Satoshi; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Niitaka, Seiji*; Azuma, Masaki*; Shimakawa, Yuichi*; Takano, Mikio*; Izumi, Fujio*; et al.
Chemistry of Materials, 18(3), p.798 - 803, 2006/02
Times Cited Count:278 Percentile:98.63(Chemistry, Physical)The crystal and magnetic structures of polycrystalline BiCoO have been determined by the Rietveldmethod from neutron diffraction data measured at temperatures from 5 to 520 K. BiCoO (space groupP4mm; Z=1; a=3.72937(7) and c=4.72382(15) at room temperature; tetragonality c/a=1.267) is isotypic with BaTiO and PbTiO in the whole temperature range. BiCoO is an insulator with a Neeltemperature of 470 K. A possible model for antiferromagnetic order is proposed with a propagationvector of k=(1/2, 1/2, 0). In this model, magnetic moments of Co ions are parallel to the c directionand align antiferromagnetically in the ab plane. The antiferromagnetic ab layers stack ferromagneticallyalong the c axis, forming a C-type antiferromagnetic structure. Refined magnetic moments at 5 and 300K are 3.24(2) and 2.93(2), respectively. The structure refinements revealed no deviation fromstoichiometry in BiCoO. BiCoO decomposed in air above 720 K to give CoO and sillenite-like BiCoO.
Belik, A. A.*; Iikubo, Satoshi; Kodama, Katsuaki; Igawa, Naoki; Shamoto, Shinichi; Maie, Makoto*; Nagai, Takuro*; Matsui, Yoshio*; Stefanovich, S. Y.*; Lazoryak, B. I.*; et al.
Journal of the American Chemical Society, 128(3), p.706 - 707, 2006/01
Times Cited Count:114 Percentile:89.99(Chemistry, Multidisciplinary)The crystal structure of BiScO have been determined by neutron diffraction and electron diffraction measurements. All experimental results shows space group of BiScO is C2/c, which has a center of symmetry.
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 SrFeO with the Teflon polymer yields a highly fluorinated phase SrFeOO (x 0.44). The crystal/magnetic structures and anion composition are determined by a combination of neutron diffraction and 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.