Thumbnail
Access Restriction
Open

Author Chanda, Sadhan ♦ Saha, Sujoy ♦ Dutta, Alo ♦ Sinha, T. P.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword 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
Abstract 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 of DNMO have been studied by performing first principles calculation based on density functional theory.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-02-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 62


Open content in new tab

   Open content in new tab