Effects of Forming Gas Annealing on Ba4Nb2O9 Ceramics

Yuan Meng; Wan Ping Chen

doi:10.4028/www.scientific.net/MSF.687.275

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HomeMaterials Science ForumMaterials Science Forum Vol. 687Effects of Forming Gas Annealing on Ba4Nb2O9...

Effects of Forming Gas Annealing on Ba₄Nb₂O₉Ceramics

Abstract:

Ba₄Nb₂O₉ ceramics were synthesized via solid state reaction and sintered in air. Annealing in 5%H₂+ 95%N₂ at 900°C for 2 h resulted in an increase in leakage current by several orders of magnitude, and obvious increases in low-frequency capacitance and dielectric loss, while re-oxidation in air at 900°C for 2 h led to a partial recovery. It is proposed that oxygen vacancies and Nb⁴⁺ were formed through annealing in the reducing atmosphere while inverse process occurred in the re-oxidation treatment. Re-oxidation is helpful to improve the properties of barium niobates ceramics sintered or heat-treated in reducing atmospheres and further investigations are desirable.

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Materials Science Forum (Volume 687)

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275-278

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.687.275

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June 2011

Authors:

Yuan Meng, Wan Ping Chen

Keywords:

Annealing, Barium Niobate, Dielectric, Hydrogen

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