Dielectric properties of strontium iron holmium niobate ceramics

Strontium iron holmium niobate (Sr(Fe1−xHox)0.5Nb0.5O3) 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...

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Bibliographic Details
Published in:Ceramics international 2013-05, Vol.39, p.S227-S231
Main Authors: Sanjoom, K., Tunkasiri, T., Pengpat, K., Eitssayeam, S., Rujijanagul, G.
Format: Article
Language:English
Subjects:
A. Powders: solid state reaction
B. Grain boundaries
C. Dielectric properties
Ceramics
Dielectric loss
Doping
Grain boundaries
Holmium
Iron
Niobates
Strontium
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Summary:Strontium iron holmium niobate (Sr(Fe1−xHox)0.5Nb0.5O3) 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.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2012.10.067