Physical properties and electrical aging effects in Fe3+/Nb 5+ hybrid-doped barium titanate ceramics

• Main Authors: Prasertpalichatr S., Unruan M., Sareein T., Tangsritrakul J., Dechakupta T., Ngamjarurojana A., Laosiritaworn Y., Ananta S., Yimnirun R.
• Format: Conference or Workshop Item
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-77749279867&partnerID=40&md5=f352013915ed033a44ca0846b85d5794; http://cmuir.cmu.ac.th/handle/6653943832/5737
• Institution: Chiang Mai University

It is well known that acceptor and donor doping results in opposite ferroelectric aging effects; however, the aging effects in hybrid-doped (acceptor+donor) materials has remained mysterious. Thus, the aging behavior of dielectric and ferroelectric properties in Fe3+/Nb5+ hybrid-doped BaTiO3 ceramics was investigated in this study. The concentration of acceptor dopant (Fe3 +) was fixed at 1 mol%, while that of donor dopant (Nb5+) was varied from 0.5-2.0 mol%. The SEM and XRD techniques were used to study the microstructure and phase formation, respectively. The results showed that the dielectric properties of all de-aged samples decreased exponentially with time. The aged samples with 0.5 and 1.0 mol% Nb5+ obviously showed constricted hysteresis loops, while those with higher concentration of Nb5+ (1.5-2.0 mol%) showed normal hysteresis loops. The explanations based on the effects of defect dipole were discussed. Copyright © Taylor & Francis Group, LLC.