open access

https://hdl.handle.net/2115/85097

Formation and morphological change of BaTaO2N perovskite from BaCN2/Ta2O5 mixture

英語

Thermal analysis

2020-09-25

Elsevier

Journal of alloys and compounds

836

155459

Metal oxynitrides are generally synthesized by heating their component oxides in a flow of ammonia for longer than 20 h. In the present study, pure BaTaO2N oxynitride perovskite powder was obtained by heating a mixture of tetragonal BaCN2 and Ta2O5 in a flow of nitrogen. The BaTaO2N powder synthesized at slightly below the melting point of tetragonal BaCN2 (910 degrees C) was found to consist of coarse aggregates of 300 nm-sized particles based on scanning electron microscopy observations. In contrast, BaTaO2N powder obtained above the melting point of tetragonal BaCN2 contained highly-dispersed particles after washing with acid. This difference is attributed to the dissolution and precipitation of the surfaces of the BaTaO2N grains in the BaCN2 melt to generate grain boundary layers soluble in acid. This work represents the first report of the synthesis of a metal oxynitride using a metal carbodiimide as both the metal and nitrogen source. (C) 2020 Elsevier B.V. All rights reserved.

学術雑誌論文

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© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/

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