Studying dielectric mechanism and magnetization of double perovskite Gd{sub 2}NiMnO{sub 6} ceramic

Journal Article · Mon May 23 00:00:00 EDT 2016 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4948149· OSTI ID:22608859

Mohapatra, S. R.; Singh, A. K. ^[1]; Kaushik, S. D. ^[2]

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1. Department of Physics and Astronomy, National Institute of Technology, Rourkela-769008, Odisha (India)
2. UGC-DAE Consortium for Scientific Research Mumbai Centre, R-5 Shed, BARC, Mumbai-400085 (India)

In the present work, the structure, dielectric and magnetic properties of Gd{sub 2}NiMnO{sub 6} double perovskite have been studied. X-Ray diffraction study reveals the phase pure formation of the material that crystallizes into monoclinic phase (space group ’P2{sub 1}/n’). Surface morphology depicts heterogeneous grain distribution with average grain size of ~1 µm. Temperature dependent (50 – 330 K) dielectric measurements at different frequencies (0.5 - 50 kHz) relate to Maxwell-Wagner interfacial polarization model. Giant dielectric constant at 1 kHz for 300 K (ε’ ~1900) is noticed as compared to that of 50 K (ε’ ~10) coupled with a peak shift in tan loss towards higher temperature with frequency. The activation energy (0.24 eV) obtained using Arrhenius relation for thermally activated relaxor behavior of the material signifies an electron hopping mechanism between Ni{sup 2+} and Mn{sup 4+} cations. Lastly, M-H study shows ‘S’ shape hysteresis loop at 50 K with remnant magnetization (M{sub r}) of 0.72 µ{sub B}/f.u. along with a linear plot for 300 K which reveals paramagnetic nature of the material.

• OSTI ID: 22608859
• Journal Information: AIP Conference Proceedings, Vol. 1731, Issue 1; Conference: DAE solid state physics symposium 2015, Uttar Pradesh (India), 21-25 Dec 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CERAMICS
COMPARATIVE EVALUATIONS
DIELECTRIC MATERIALS
GADOLINIUM COMPOUNDS
GRAIN SIZE
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANATES
MONOCLINIC LATTICES
NICKEL COMPOUNDS
PARAMAGNETISM
PERMITTIVITY
PEROVSKITE
PHASE SPACE
POLARIZATION
SPACE GROUPS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION