Idrees, M. Nadeem, M. Mehmood, M. Atif, M. Chae, Keun Hwa Hassan, M. M. 2024-01-20T17:31:07Z 2024-01-20T17:31:07Z 2021-09-02 2011-03-16 0022-3727 https://pubs.kist.re.kr/handle/201004/130528 Polycrystalline LaFe1-xNixO3 (x = 0.0, 0.1, 0.3 and 0.5) oxides are prepared by a solid-state reaction method. In order to explore the delocalization effects of disorder induced by Ni substitution, dependence of the ac electrical properties of the synthesized composition is investigated in a wide temperature (77-300 K) and frequency (1-10 MHz) range by impedance spectroscopy. Room temperature near-edge x-ray absorption fine structure experiment at O K edge is performed to probe the unoccupied density of states. Grain boundaries play a dominant role in determining the resistive properties of the series. These systems are semiconducting and the origin of their semiconducting nature changes with Ni doping. At low doping levels (x <= 0.3) the semiconducting nature is dominated by an increase in mobility of the localized charge carriers, which hop between their localized states. For x = 0.5, the semiconducting nature is determined by an increase in carrier density. These results are explained in terms of a metallic conduction band formed by the hybridization of O 2p and Ni 3d orbitals. English IOP PUBLISHING LTD METAL-INSULATOR-TRANSITION NARROW ENERGY-BANDS ELECTRON CORRELATIONS MAGNETIC-PROPERTIES GRAIN-BOUNDARIES CONDUCTIVITY LANI1-XMNXO3 DIFFUSION TRANSPORT CERAMICS Impedance spectroscopic investigation of delocalization effects of disorder induced by Ni doping in LaFeO3 Article 10.1088/0022-3727/44/10/105401 1 JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.44, no.10 JOURNAL OF PHYSICS D-APPLIED PHYSICS 44 10 scie scopus 000287651000014 2-s2.0-79952178759 Physics, Applied Physics Article METAL-INSULATOR-TRANSITION NARROW ENERGY-BANDS ELECTRON CORRELATIONS MAGNETIC-PROPERTIES GRAIN-BOUNDARIES CONDUCTIVITY LANI1-XMNXO3 DIFFUSION TRANSPORT CERAMICS NEXAFS Grain boundaries