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Ferroelectric BaTaO2N Crystals Grown in a BaCN2 Flux

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Title: Ferroelectric BaTaO2N Crystals Grown in a BaCN2 Flux
Authors: Hosono, Akira Browse this author
Masubuchi, Yuji Browse this author →KAKEN DB
Yasui, Shintaro Browse this author
Takesada, Masaki Browse this author
Endo, Takashi Browse this author
Higuchi, Mikio Browse this author
Itoh, Mitsuru Browse this author
Kikkawa, Shinichi Browse this author
Keywords: Oxynitride
Metal carbodiimide
Crystal growth
Issue Date: 16-Dec-2019
Publisher: American Chemical Society
Journal Title: Inorganic chemistry
Volume: 58
Issue: 24
Start Page: 16752
End Page: 16760
Publisher DOI: 10.1021/acs.inorgchem.9b02917
Abstract: Perovskite-type oxynitride BaTaO2N has been attracting attention for its large dielectric constant, which is almost independent of the temperature by measurements on its ceramics. Its dielectric characteristics are attributed to polar nanoregions (PNRs) in the average cubic crystal structure. Polarization saturation to produce a butterfly-like piezoresponse force microscopy (PFM) signal was observed on BaTaO2N crystals in the present study. Reddish crystallites of BaTaO2N of up to 3.1 mu m in size were grown using a BaCN2 flux. Grain growth proceeded through the formation of a Ruddlesden-Popper-type oxynitride from the reaction between BaTaO2N powder and molten BaCN2. Their electrical property was studied using PFM with special care because of the small size of the crystals. They were found to be much more highly insulating than its ceramics. Ferroelectricity with complete phase inversion was observed on an oxynitride perovskite crystal for the first time. A large coercivity of 50-60 V was observed in the measurement. Such ferroelectricity is ascribed to the PNRs induced by the polar linkages between cis-type TaO4N2 octahedra.
Rights: This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in Inorganic chemistry, copyright c American Chemical Society after peer review. To access the final edited and published work see
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鱒渕 友治

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