Dielectric properties of strontium iron holmium niobate ceramics

• Main Authors: K. Sanjoom, T. Tunkasiri, K. Pengpat, S. Eitssayeam, G. Rujijanagul
• Format: Journal
• Published: 2018
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84875736132&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/47953
• Institution: Chiang Mai University

Strontium iron holmium niobate (Sr(Fe 1-x Ho x ) 0.5 Nb 0.5 O 3 ) ceramics were synthesized via a solid-state reaction technique. The undoped ceramic showed an orthorhombic phase, but it transformed to a pseudocubic phase for higher Ho concentrations. A low solubility limit of Ho in SFN caused a formation of second phase for the x=0.15 ceramic. Dielectric behavior of undoped ceramic exhibited high dielectric constant over a wide temperature range. However, the doping shifted this region to a higher temperature. The doping also shifted the peak of dielectric loss to a higher temperature. Activation energy of dielectric relaxation increased with increasing Ho concentration. In addition, complex impedance analysis was applied to determine the behaviors of grain boundary and grain after doping. © 2012 Elsevier Ltd and Techna Group S.r.l.