Additive sintering and post-ammonolysis of dielectric BaTaO2N oxynitride perovskite

The sintering and thermal stability of BaTaO2N oxynitride perovskite were investigated as an alternative to SrTaO2N dielectric ceramics. The decomposition behaviors of the perovskites were similar, and the temperatures were slightly lower for BaTaO2N than for SrTaO2N. A BaTaO2N compact containing 2....

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Published inJournal of the European Ceramic Society Vol. 36; no. 14; pp. 3341 - 3345
Main Authors Hosono, Akira, Sun, Shi-Kuan, Masubuchi, Yuji, Kikkawa, Shinichi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.11.2016
Subjects
BaTaO2N
Dielectric behavior
Oxynitride
Post-ammonolysis
Sintering
BaTaO2N
Post-ammonolysis
Sintering
Dielectric behavior
Oxynitride
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Summary:The sintering and thermal stability of BaTaO2N oxynitride perovskite were investigated as an alternative to SrTaO2N dielectric ceramics. The decomposition behaviors of the perovskites were similar, and the temperatures were slightly lower for BaTaO2N than for SrTaO2N. A BaTaO2N compact containing 2.5wt% BaCO3 sintering aid was sintered at 1400°C in 0.2MPaN2. Post-ammonolysis was necessary for the sintered black ceramics to recover the original red color. The insulating post-ammonolysis product with a relative density RD=73.0% showed a real relative permittivity εr=620 and a tanδ=0.4 at 102Hz, which changed slightly to εr=320 with tanδ=2.0×10−2 at 108Hz. The porosity was necessary to eliminate the electronic contribution affected on the extremely large values reported by Kim et al. in 2004 [1]. BaTaO2N ceramics showed better dielectric performance than SrTaO2N ceramics and it changed a little at temperatures up to 150°C.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2016.05.006