Structural,dielectric properties and electrical conduction behaviour of Dy substituted CaCu3Ti4O12 ceramics |
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Authors: | Raman Kashyap RK Mishra OP Thakur RP Tandon |
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Affiliation: | 1. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India;2. Solid State Physics Laboratory, Timarpur, Delhi 110054, India |
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Abstract: | Dy substituted CCTO ceramics were synthesized using solid state reaction method. Effect of Dy on structural, microstructural, dielectric and electrical properties has been studied over a wide temperature (300–500 K) and frequency range (100 Hz–1 MHz). Rietveld refinement, carried out on the samples, confirmed single phase formation and indicated overall decrease in lattice constant. Microstructure showed bimodal distribution of grains in CCTO with bigger grains surrounded by smaller grains. Dy substitution reduced grain size. Dy substitution in CCTO reduces the dielectric constant which may be attributed to increase of the Schottky potential barrier. The dielectric constant remains nearly constant in temperature range 300–400 K. The AC conductivity obeys a power law, σac=A fn, where n is the temperature dependent frequency exponent. The AC conductivity behaviour can be divided into three regions, over entire temperature range, depending on conduction processes. The relevant charge transport mechanisms have been discussed. |
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Keywords: | A Powders: solid state reaction method B Grain boundaries C Dielectric properties C Electrical conductivity |
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