Microstructure and dielectric properties of (1-x)SrFe<inf>0.5</inf>Nb<inf>0.5</inf>O<inf>3</inf>-xBaTiO<inf>3</inf>ceramics

• Main Authors: Thanatep Phatungthane, Gobwute Rujijanagul
• Format: Journal
• Published: 2018
• Subjects: Agricultural and Biological Sciences
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84919474579&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/44384
• Institution: Chiang Mai University

© 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (1-x)SrFe 0.5 Nb 0.5 O 3 -xBaTiO 3 ((1-x)SFN-xBT) powders with x=0.00-0.50 were synthesized via a molten-salt synthesis process. All x < 0.50 calcined powders exhibited pure phase perovskite after a relatively low calcination temperature of 800 °C. Ceramics of (1-x)SFN-xBT were then fabricated from the calcined powders. Increasing BT inhibited grain growth, but produced an improvement in dielectric constant. Very high dielectric constants (ε r ~2.96×10 5 at 1 kHz and 351 °C) were recorded for the x=0.25 ceramics. All ceramics displayed a strong frequency dependent dielectric, especially for the x=0.25 ceramics. The dielectric constant behaviour of the studied ceramics was related to the Maxwell-Wagner polarization mechanism. In addition, the x=0.25 ceramics exhibited a very high relative dielectric tunability (n r ~76%) at room temperature.