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Effects of Cobalt Dopant on Microstructure and Electrical Properties of Bi0.5Na0.5TiO3 Ceramics


Paper Type 
 Contributed Paper
Title 
 Effects of Cobalt Dopant on Microstructure and Electrical Properties of Bi0.5Na0.5TiO3 Ceramics
Author 
 Suwapitcha Buntham, Paitoon Boonsong, Panupong Jaiban, Nittaya Keawprak and Anucha Watcharapasorn
Email 
 anucha@stanfordalumni.org
Abstract:
Co-doped (Bi0.5Na0.5)TiO3 ceramics with varied doping concentration of 0, 0.005, 0.01, 0.02 and 0.03 mol fraction were prepared by conventional solid state reaction method. The firing condition used was 1050 ฐC for 2 h. X-ray diffraction results showed that all produced ceramics were single phase with a rhombohedral perovskite structure. Due to the replacement of Ti4+ions with Co2+ at B-site, there was a slight shift of X-ray diffraction pattern to the left. SEM micrographs of the ceramics indicated that a small amount of Co addition could eliminate pores and improved densification. However, above 0.01 Co mol fraction, excessive grain growth occurred and large pores were again observed. The dielectric constant and piezoelectric coefficient reached maximum values of 670 and 105 pC/N, respectively, in the sample doped with 0.01 Co mol fraction. Ferroelectric characteristics were also found to increase with increasing dopant concentration.
Start & End Page 
 2481 - 2490
Received Date 
 2017-07-05
Revised Date 
Accepted Date 
 2017-09-12
Full Text 
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Keyword 
 BNT, microstructure, electrical properties, Cobalt dopant
Volume 
 Vol.45 No.6 (September 2018)
DOI 
Citation 
 Buntham S., Boonsong P., Jaiban P., Keawprak N. and Watcharapasorn A., Effects of Cobalt Dopant on Microstructure and Electrical Properties of Bi0.5Na0.5TiO3 Ceramics, Chiang Mai Journal of Science, 2018; 45(6): 2481-2490.
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