Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/105833
Title: Effect of NiO substitution on the structural and dielectric behaviour of NaNbO3
Authors: Tiwari, Nidhi
George, R. T.
Joshi, D. C.
Nayak, S.
Chauhan, R. N.
Pramanik, P.
Dar, T. A.
Ghosh, S.
Thota, S.
Keywords: Ceramics
Antiferroelectricity
DRNTU::Science::Chemistry
Issue Date: 2018
Source: George, R. T., Joshi, D. C., Nayak, S., Tiwari, N., Chauhan, R. N., Pramanik, P., . . . Thota, S. (2018). Effect of NiO substitution on the structural and dielectric behaviour of NaNbO3. Journal of Applied Physics, 123(5), 054101-. doi:10.1063/1.5013643
Series/Report no.: Journal of Applied Physics
Abstract: The structural and dielectric properties of NiO substituted NaNbO3 ceramics are reported. The orthorhombic (Pmna) crystal structure of NaNbO3 transforms to a lower symmetry monoclinic phase (Pbma) after the dilute dispersion of NiO. X-ray photoelectron spectroscopy reveals pentavalent “Nb,” monovalent “Na,” and divalent “Ni” states along with the signatures of non-local screening effects. The antiferroelectric to paraelectric transition (TAFE) accompanied by a structural change from the orthorhombic to the tetragonal phase shifts by 55 C toward the low-temperature side, whereas the morphotropic phase boundary (TO-M) moves toward a higher temperature by 28 C for nominal substitutions (x 0:10). The generalized Lyddane-Sachs-Teller expression e0 S0e1 ¼ ðxlxtÞ2 and thermodynamic free energy models are employed to explain the anomalous behaviour of the temperature dependence of relative dielectric permittivity (er(T)) across TAFE and TO-M. The frequency dependence of ac-conductivity rac(x) follows the Jonscher power law (rac ¼ r(0) þ Axs), suggesting the dominance of the phonon-assisted hopping mechanism, whereas the frequency independent term (r(0)) was explained by Funke’s Jump-Relaxation Model.
URI: https://hdl.handle.net/10356/105833
http://hdl.handle.net/10220/48778
ISSN: 0021-8979
DOI: 10.1063/1.5013643
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2018 The Author(s). All rights reserved. This paper was published by AIP Publishing in Journal of Applied Physics and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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