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S.L. Samala, T. Magdalenob, K.V. Ramanujacharyb, S.E. Loflandc and A.K. Gangulia, 
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Abstract
Double perovskites of the type LaBaNi1−xCoxTaO6 (0 ≤ x ≤ 1) have been synthesized by solid state method. The compounds crystallize in the tetragonal space group, I4/m. Rietveld refinement has been carried out to determine the phase purity and to study the cation ordering. X-ray photoelectron spectroscopy confirms Co(II) in all compositions. The end members in LaBaNi1−xCoxTaO6 show high dielectric constant values. Antiferromagnetic ordering has been observed for all the compositions and the ordering temperature in LaBaNi1−xCoxTaO6 gradually decreases with increase in Co doping, which has been attributed to the decrease in covalence of Co/Ni−O bonds.
Keywords: Perovskites; Rietveld refinement; Dielectric properties
