Effects of GeO 2 addition on physical and electrical properties of BaFe 0.5Nb 0.5O 3 ceramic

• Main Authors: Kantha P., Pisitpipathsin N., Pengpat K., Eitssayeam S., Rujijanagul G., Gua R., Bhalla A.S.
• Format: Conference or Workshop Item
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-84866331743&partnerID=40&md5=34194a069ece9a993aef9ec6a7f8b8c7; http://cmuir.cmu.ac.th/handle/6653943832/6663
• Institution: Chiang Mai University

This paper presents the effect of GeO 2 glass former on the physical and electrical properties of BaFe 0.5Nb 0.5O 3 (BFN) perovskite ceramics. The BFN powder was prepared by a conventional mixed-oxide method and the GeO 2 contents, ranging from 1 to 5 wt.%, were subsequently added to the calcined BFN powder. The mixtures were pressed and sintered to form dense ceramics. We showed that, with the addition of GeO 2, the maximum density was achieved at lower sintering temperature, approximately 200-225 °C lower than those required by the pure BFN ceramic. However, the densities of these GeO 2 doped BFN ceramics were slightly lower than those of pure BFN due to the occurrence of pores. We also found that the addition of GeO 2 reduces the dielectric loss at room temperature from 4.29 to 0.39-0.79 but the dielectric constant at room temperature decreased with the increased GeO 2 concentrations. With small amount of added GeO 2, ferroelectric property of BFN ceramics was also obtained, as confirmed by their hysteresis loops. © 2012 Elsevier Ltd. All rights reserved.