Abstract
The dielectric and conductive characteristics of La 2NiMnO 6 double perovskite ceramics were investigated together with the crystal structure. La 2NiMnO 6 ceramics crystallized in the monoclinic P2 1/ n structure in which the Ni 2+ and Mn 4+ ions ordered periodically. Relaxor-like dielectric behavior combined with a giant dielectric constant step was observed in the present ceramics, and these unique dielectric characteristics should be attributed to the charge ordering of Ni 2+ and Mn 4+. The dielectric relaxation was well fitted by the modified Debye equation and Arrhenius law with the activation energy of 0.17 eV. The dc conductivity of La 2NiMnO 6 could be well fitted using a variable-range hopping mechanism instead of a band conduction mechanism.
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