Effects of Forming Gas Annealing on Ba4Nb2O9 Ceramics

Abstract:

Article Preview

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.

Info:

Periodical:

Edited by:

Chengming Li, Chengbao Jiang, Zhiyong Zhong and Yichun Zhou

Pages:

275-278

DOI:

10.4028/www.scientific.net/MSF.687.275

Citation:

Y. Meng and W. P. Chen, "Effects of Forming Gas Annealing on Ba4Nb2O9 Ceramics", Materials Science Forum, Vol. 687, pp. 275-278, 2011

Online since:

June 2011

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.