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Title: Structural and transport properties of double perovskite Dy{sub 2}NiMnO{sub 6}

Highlights: • Sol–gel citrate method is used to prepare the double perovskite Dy{sub 2}NiMnO{sub 6}. • Structure and dielectric relaxation of the sample are studied for nano and bulk phases. • The relaxation mechanism of the sample is modeled by Cole–Cole equation. • With increasing sintering temperature conductivity increases. • Electronic structures and magnetic properties have been studied by DFT calculations. - Abstract: The double perovskite oxide Dy{sub 2}NiMnO{sub 6} (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{sub 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 ofmore » DNMO have been studied by performing first principles calculation based on density functional theory.« less
Authors:
; ; ;
Publication Date:
OSTI Identifier:
22420810
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 62; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERAMICS; CITRATES; DENSITY FUNCTIONAL METHOD; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; DYSPROSIUM COMPOUNDS; ELECTRONIC STRUCTURE; EV RANGE; FREQUENCY DEPENDENCE; IMPEDANCE; MAGNETIC PROPERTIES; MANGANATES; MHZ RANGE; MONOCLINIC LATTICES; NICKEL COMPOUNDS; RELAXATION LOSSES; SINTERING; TEMPERATURE RANGE 0273-0400 K; X-RAY DIFFRACTION