Journal
MATERIALS RESEARCH BULLETIN
Volume 62, Issue -, Pages 153-160Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2014.11.021
Keywords
Ceramics; Sol-gel chemistry; Impedance spectroscopy; Dielectric properties; Electronic structure
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Funding
- UGC, New Delhi (India)
- Department of Science and Technology through DST Fast Track Project [SR/FTP/PS-032/2010]
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TheThe double perovskite oxide Dy2NiMnO6 (DNMO) is synthesized in nano and bulk phase by the sol-gel citrate method. The Rietveld refinement of X-ray diffraction pattern of the sample at room temperature shows the monoclinic P2(1)/n phase. Dielectric relaxation of the sample is investigated in the impedance and electric modulus formalisms in the frequency range from 50 Hz to 1 MHz and in the temperature range from 253 to 415 K. The Cole-Cole model is used to explain the relaxation mechanism in DNMO. The frequency-dependent maxima in the imaginary part of impedance are found to obey an Arrhenius law with activation energy of 0.346 and 0.344 eV for nano and bulk DNMO, respectively. A significant increase in conductivity of bulk DNMO has been observed than that of the nanoceramic. Electronic structures and magnetic properties of DNMO have been studied by performing first principles calculation based on density functional theory. (C) 2014 Elsevier Ltd. All rights reserved.
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