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Sintering and dielectric properties of perovskite SrTaO2N ceramics

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Title: Sintering and dielectric properties of perovskite SrTaO2N ceramics
Authors: Zhang, Ya-Ru Browse this author
Motohashi, Teruki Browse this author →KAKEN DB
Masubuchi, Yuji Browse this author →KAKEN DB
Kikkawa, Shinichi Browse this author →KAKEN DB
Keywords: Perovskite oxynitrides
Dielectric properties
Hot pressing
Sintering additives
Issue Date: Jun-2012
Publisher: Elsevier
Journal Title: Journal of the European Ceramic Society
Volume: 32
Issue: 6
Start Page: 1269
End Page: 1274
Publisher DOI: 10.1016/j.jeurceramsoc.2011.12.001
Abstract: Single-phase perovskite oxynitride SrTaO2N ceramics were prepared by pressureless sintering at 1400℃ under a nitrogen atmosphere, using 5 wt% of SrCO3 or La2O3 as a sintering additive. In contrast, SrTaO2N bulks without additives contained TaC and Ta3N5 impurities. Sintering in nitrogen led to oxygen/nitrogen deficiencies in the oxynitride, while post annealing in flowing ammonia was effective to eliminate the anion vacancies. The introduction of additives significantly improved the sinterability of SrTaO2N ceramics. A relative density of >90% in the bulk was achieved with a highly dense microstructure with smaller grain sizes. The SrTaO2N bulk with SrCO3 additive exhibited superior dielectric performance with a high relative permittivity (εr =1.0 x 10^[4]) and dissipation factor (tan δ = 0.039) at a frequency of 1 MHz.
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: 本橋 輝樹

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