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FKatsumata, Tetsuhiro*; Suzuki, Ryo*; Sato, Naoto*; Oda, Ryoya*; Motoyama, Shingo*; Suzuki, Shumpei*; Nakashima, Mamoru*; Inaguma, Yoshiyuki*; Mori, Daisuke*; Aimi, Akihisa*; et al.
Chemistry of Materials, 36(8), p.3697 - 3704, 2024/04
Times Cited Count：1 Percentile：30.18(Chemistry, Physical)A perovskite-type oxynitride BaFeOF was prepared by high-pressure synthesis. Since the SHG signal was observed in the obtained material, suggesting the existence of spontaneous polarization, the mechanism of polarization was investigated by synchrotron high-energy X-ray diffraction. The obtained pair distribution functions were fitted, and a local polarization mechanism with different orientations was found. Since BaFeOF is also a magnetic material, a magnetic domain and a ferroelectric domain are considered to coexist.
F and comparison of the structure among perovskite-type oxyfluoridesKatsumata, Tetsuhiro*; Suzuki, Ryo*; Sato, Naoto*; Suzuki, Shumpei*; Nakashima, Mamoru*; Inaguma, Yoshiyuki*; Mori, Daisuke*; Aimi, Akihisa*; Yoneda, Yasuhiro
Journal of Solid State Chemistry, 279, p.120919_1 - 120919_8, 2019/11
Times Cited Count：12 Percentile：56.06(Chemistry, Inorganic & Nuclear)Katsumata, Tetsuhiro*; Inaguma, Yoshiyuki*; Mori, Daisuke*; Aimi, Akihisa*; Yoneda, Yasuhiro
Seramikkusu, 54(9), p.629 - 632, 2019/09
Crystal structure analysis of ABO
perovskite-type oxyfluoride were performed by using high-energy synchrotron X-ray measurement. The effect of tolerance factor appeared in the local structure. The average structure of perovskite-type oxyfluoride found to be a cubic structure in the traditional crystal structure analysis.
with perovskite- and LiNbO-type structuresInaguma, Yoshiyuki*; Tanaka, Kie*; Tsuchiya, Takeshi*; Mori, Daisuke*; Katsumata, Tetsuhiro*; Oba, Tomonori*; Hiraki, Koichi*; Takahashi, Toshihiro*; Saito, Hiroyuki
Journal of the American Chemical Society, 133(42), p.16920 - 16929, 2011/09
Times Cited Count：98 Percentile：87.34(Chemistry, Multidisciplinary)F and BaInOFKatsumata, Tetsuhiro*; Inaguma, Yoshiyuki*; Aimi, Akihisa*; Yoneda, Yasuhiro
no journal, ,
The search for novel materials requires the search for compounds with compositional flexibility. Mixed anion compounds such as perovskite oxyfluorides are promising materials. In these compounds, the relationship between structure and tolerance factor t is interesting. In this study, perovskite oxyfluorides with various t, BaInOF (t=0.97), BaScOF (t=0.99) and BaFeOF, were synthesized and their local and average structures were investigated by X-ray diffraction and pair distribution (PDF) methods, respectively. Furthermore, the relationship between the structure and the tolerance factor t was discussed.
FInaguma, Yoshiyuki*; Katsumata, Tetsuhiro*; Takami, Takuya*; Mimura, Kazunori*; Kobayashi, Shintaro*; Kawaguchi, Shogo*; Yoneda, Yasuhiro
no journal, ,
While most of the reported Perovskite-type complex anionic acid fluorides have a cubic crystal structure, AgTiOF has a tetragonal structure and the anion octahedron is tilted in anti-phase. In order to clarify why these differences arise, we investigated the average structure, local structure, polarity, and their interrelationships, and clarified the origin of the polarity. Optical second harmonic (SHG) measurements were performed, and the SHG signal was observed at room temperature, suggesting the possibility of polarity. In addition, the corresponding phase transition was observed by high-temperature X-ray diffraction measurements. From these results, it is necessary to analyze the local structure using a structural model with microscopic polarization.
