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- W2785681644 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 (ε0−S′ε∞)=(ωlωt)2 and thermodynamic free energy models are employed to explain the anomalous behaviour of the temperature dependence of relative dielectric permittivity (εr(T)) across TAFE and TO-M. The frequency dependence of ac-conductivity σac(ω) follows the Jonscher power law (σac = σ(0) + Aωs), suggesting the dominance of the phonon-assisted hopping mechanism, whereas the frequency independent term (σ(0)) was explained by Funke's Jump-Relaxation Model." @default.
- W2785681644 created "2018-02-23" @default.
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- W2785681644 date "2018-02-01" @default.
- W2785681644 modified "2023-09-26" @default.
- W2785681644 title "Effect of NiO substitution on the structural and dielectric behaviour of NaNbO3" @default.
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- W2785681644 doi "https://doi.org/10.1063/1.5013643" @default.
- W2785681644 hasPublicationYear "2018" @default.
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