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Structural Interpretation of Ion Transport and Small Polaron Hopping Conduction in Gd Substituted Nickel Nanoferrites
Author(s) -
Sinha Ankurava,
Dutta Abhigyan
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700908
Subject(s) - variable range hopping , polaron , materials science , rietveld refinement , nanocrystalline material , analytical chemistry (journal) , orthorhombic crystal system , doping , electrical resistivity and conductivity , thermal conduction , dielectric , ion , condensed matter physics , nickel , dopant , crystallography , chemistry , crystal structure , nanotechnology , metallurgy , physics , optoelectronics , electron , organic chemistry , quantum mechanics , chromatography , composite material
In this work, structural, optical and electrical properties of Gd‐doped Nickel ferrite nanocrystalline materials [NiFe 2− x Gd x O 4 ( x = 0.00–0.15)] prepared through citrate auto‐ignition method are reported. The X‐ray diffraction (XRD) study reveals that prepared samples are purely single phase for lower Gd concentration but for higher Gd concentration, an orthorhombic phase of GdFeO 3 appears which is confirmed from Rietveld analysis. The UV–Vis study points to the semiconducting nature of the prepared samples. The electrical analysis shows that the ac conductivity of the samples increases with the increase in Gd doping concentration upto x = 0.10 and then decreases. The dielectric relaxation process is analyzed using Havriliak–Negami formalism. The existence of small polaron hopping conduction is verified using Mott's variable range hopping model.