Abstract
Structural, dielectric and transport properties of single phase Sr(B′1/3Nb2/3)O3 where (B′ = Mg2+, Co2+, Cu2+) relaxor ferroelectric compounds synthesized by standard solid state reaction technique, are reported here. All the samples exhibit strong correlation between structure, dielectric and transport behavior. In this system significant Jahn-Teller distortion, induces enhancement in dielectric properties. Further, weak Jahn-Teller distortion due to unevenly occupied t2g levels in Co2+ produces intermediate rise in ϵ′ as well as inbuilt flexibility to conduction electron movement enhances dielectric loss (tanδ). On the other hand, strong Jahn-Teller effects in Cu2+ substituted compound, due to unevenly occupied eg levels, results in large enhancement in ϵ′ and frequency exponent ‘s’. This is accompanied by significant fall in dielectric loss due to localization of conduction electrons within oxygen octahedron.
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