Itaru Oikawa
Tohoku University
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Publication
Featured researches published by Itaru Oikawa.
Dalton Transactions | 2014
Itaru Oikawa; Hitoshi Takamura
The correlation between the local structure and the electric-field gradient at the Sc site in ScO6 polyhedra in Sc2O3, Ba3Sc4O9 and BaSc2O4 was investigated by means of (45)Sc NMR spectroscopy and DFT calculations. The electric-field gradient at the nucleus as determined experimentally and by calculations is compared using the quadrupolar coupling constant, CQ, around chemically and crystallographically distinct Sc sites in Sc-containing compounds. With CQ as the NMR parameter, the results obtained from the DFT calculation were in good agreement with the NMR measurements. The increase in the CQ values with the standard deviation of the O-O bond length surrounding Sc indicates that CQ is affected by the distribution of the six nearest neighboring O atoms around Sc. This study suggests that CQ plays an important role as an indicator of the local structure around ions, and that a combined complementary approach using both NMR spectroscopy and DFT calculation can be used along with diffraction techniques to provide a detailed understanding of crystal structures.
Solid State Ionics | 2012
Itaru Oikawa; Mariko Ando; Hajime Kiyono; Masataka Tansho; Tadashi Shimizu; Hideki Maekawa
Chemistry of Materials | 2015
Itaru Oikawa; Hitoshi Takamura
Applied Surface Science | 2015
Akihiro Ishii; Yoko Nakamura; Itaru Oikawa; Atsunori Kamegawa; Hitoshi Takamura
Solid State Ionics | 2011
Itaru Oikawa; Mariko Ando; Yasuto Noda; Koji Amezawa; Hajime Kiyono; Tadashi Shimizu; Masataka Tansho; Hideki Maekawa
Solid State Ionics | 2012
Hajime Kiyono; Yuuya Matsuda; Toshihiro Shimada; Mariko Ando; Itaru Oikawa; Hideki Maekawa; Susumu Nakayama; Shinobu Ohki; Masataka Tansho; Tadashi Shimizu; Pierre Florian; Dominuqie Massiot
Solid State Ionics | 2011
Mariko Ando; Itaru Oikawa; Yasuto Noda; Shinobu Ohki; Masataka Tansho; Tadashi Shimizu; Hajime Kiyono; Hideki Maekawa
Solid State Ionics | 2014
Rinlee Butch Cervera; Yukiko Oyama; Shogo Miyoshi; Itaru Oikawa; Hitoshi Takamura; Shu Yamaguchi
Applied Surface Science | 2017
Akihiro Ishii; K. Kobayashi; Itaru Oikawa; Atsunori Kamegawa; Masaaki Imura; Toshimasa Kanai; Hitoshi Takamura
Inorganic Chemistry | 2016
Takeya Mezaki; Yota Kuronuma; Itaru Oikawa; Atsunori Kamegawa; Hitoshi Takamura