Grain growth kinetics in Dy-doped Bi<inf>0.5</inf>Na<inf>0.5</inf>TiO<inf>3</inf> ceramics

• Main Authors: A. Watcharapasorn, S. Jiansirisomboon
• Format: Journal
• Published: 2018
• Subjects: Chemical Engineering; Materials Science
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=42649085405&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/60225
• Institution: Chiang Mai University

Dysprosium-doped bismuth sodium titanate ceramics were prepared using the conventional mixed-oxide method. The amount of dysprosium used was varied from 0 to 2 at.%. The mixed powders were calcined at 800 °C and checked for phase purity using X-ray diffraction technique. The calcined powders were then cold-pressed into pellets and sintered at 1050 °C for the time ranging from 2 to 48 h. The ceramics were checked for phases and microstructures using an X-ray diffractometer and a scanning electron microscope, respectively. The analysis showed that undoped BNT ceramics sintered at longer time exhibited a significant grain growth with non-uniform grain size distribution and shape. The Dy-doped BNT however showed a much more limited grain growth behavior, resulting in smaller grain size and more equiaxed grain shape. It was also found that all Dy-doped BNT ceramics sintered at 48 h possessed lower porosity than those sintered for shorter time. © 2007 Elsevier Ltd and Techna Group S.r.l.