Characterization of Bi4Ti3O12 powder prepared by the citrate and oxalate coprecipitation processes

• Main Authors: Thongtem T., Thongtem S.
• Other Authors: Zhu W.Yao X.Kimura T.Bhalla A.
• Format: Conference or Workshop Item
• Language: English
• Published: 2014
• Online Access: http://www.scopus.com/inward/record.url?eid=2-s2.0-4344609661&partnerID=40&md5=3c6aadb6ccb657ca2fd623576bb37dea; http://cmuir.cmu.ac.th/handle/6653943832/6719
• Institution: Chiang Mai University

Bismuth titanate (Bi4Ti3O12) powder was prepared by citrate and oxalate coprecipitation of bismuth nitrate pentahydrate, Bi(NO3)3·5H2O and titanium butoxide, Ti(OC4H9)4. The intermediate products with 500-1000°C calcination were characterized using the XRD. At low temperature, Bi4Ti3O12 powder and some impurities were detected. At 1000°C, the purified powder was obtained. At 700°C and above, the powder underwent a phase transformation from tetragonal to orthorhombic. By using the TGA, the intermediates prepared by the citrate and oxalate coprecipitation processes were the citrate salt and the oxalate-hydroxide mixture, respectively. The FTIR analysis showed the Ti-O stretching in the 811-816 and 574-584cm-1. The morphologies shown by the SEM micrographs were consistent with the XRD patterns. © 2004 Elsevier Ltd and Techna Group S.r.l. All rights reserved.