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Spark plasma sintering of dielectric BaTaO2N close to the melting point of the BaCN2 additive

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Title: Spark plasma sintering of dielectric BaTaO2N close to the melting point of the BaCN2 additive
Authors: Hosono, Akira Browse this author
Inoguchi, Masashi Browse this author
Masubuchi, Yuji Browse this author →KAKEN DB
Murayama, Koji Browse this author
Iha, Michiaki Browse this author
Higuchi, Mikio Browse this author →KAKEN DB
Kikkawa, Shinichi Browse this author
Keywords: Oxynitride
Metal carbodiimide
Spark plasma sintering
Issue Date: Jun-2020
Publisher: Elsevier
Journal Title: Journal of the European ceramic society
Volume: 40
Issue: 6
Start Page: 2317
End Page: 2322
Publisher DOI: 10.1016/j.jeurceramsoc.2020.02.008
Abstract: The perovskite-type oxynitride BaTaO2N is a promising lead-free relaxor ferroelectric material. However, this material releases a part of its nitrogen during its sintering above 1350 degrees C. Subsequent annealing of the resulting sintered BaTaO2N0.85 ceramics under an ammonia flow is necessary to recover an insulating, stoichiometric BaTaO2N ceramics. Very recently, molten BaCN2 was reported to be a useful flux for the preparation of BaTaO2N microcrystals without the loss of nitrogen. In the present work, BaTaO2N powder was sintered with a BaCN2 additive under mechanical pressure, using a spark plasma sintering system. Nitrogen loss from the BaTaO2N ceramic was avoided during liquid phase sintering at approximately 900 degrees C. The stoichiometric BaTaO2N ceramic product with a relative density of 79.8 % was an electrically insulator and it showed its relative dielectric constants, epsilon(r) in the range from 320 to 650 and a loss tans values from 0.04 to 0.19 at room temperature.
Rights: ©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
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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