Abstract
Abstract The microstructure and dielectric properties of La 1.75 Ba 0.25 NiO 4 ceramics prepared by spark plasma sintering (SPS) process were investigated. The interstitial oxygen could be removed by the SPS process, and this would induce the significant decrease of electrical conductivity of the sample. The grain growth could be suppressed while the pore removal could be enhanced by the SPS process. The dielectric constant and loss were both much lower than those of Ln 2− x Sr x NiO 4 ceramics, while the activation energy of low temperature dielectric relaxation was larger. There were two dielectric relaxations in the present ceramics, the low temperature one was closely related to the charge order–disorder transition, while the high temperature one was originated from the extrinsic effects.
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