Kumar, Vinod
Kumar, Rajesh
Shukla, D. K.
Gautam, Sanjeev
Chae, Keun Hwa
Kumar, Ravi
2024-01-20T11:34:39Z
2024-01-20T11:34:39Z
2021-09-04
2013-08-21
0021-8979
https://pubs.kist.re.kr/handle/201004/127762
The structural analysis of LaCo1-xNixO3 (0 <= x <= 0.5) samples assures single phase rhombohedral structure with space-group R (3) over barc. Electronic structure of these samples has been studied by x-ray absorption near edge spectroscopy (XANES) at K-edge of O, Ni, Co and M-5,M-4 edge of La. These studies confirm the trivalent state of Co/Ni and La in all the compositions. Upon substitution of the Ni at the Co site in LaCoO3, the O K-edge spectra show a feature about 1.2 eV lower than that of LaCoO3. This feature keeps on growing as the concentration of the Ni is increasing. This is consistent with our resistivity data which shows drastic decrease in resistivity with the Ni substitution. The resistivity data have been analyzed using Arrhenius and Efros-Shklovski's type variable range hopping models in different temperature ranges. The activation energy decreases and localization length increases systematically with increase in the Ni concentration. Observed features have been explained on the basis of change in charge-carrier density with substitution. The disorder-induced localization of carriers is found to govern conduction mechanism and resistivity behavior in substituted sample. (C) 2013 AIP Publishing LLC.
English
AMER INST PHYSICS
SPIN-STATE TRANSITION
RAY-ABSORPTION SPECTROSCOPY
MAGNETIC-PROPERTIES
LACOO3
PEROVSKITES
VALENCE
TEMPERATURE
CONDUCTION
BEHAVIOR
SPECTRA
Electronic structure and electrical transport properties of LaCo1-xNixO3 (0 <= x <= 0.5)
Article
10.1063/1.4818448
1
JOURNAL OF APPLIED PHYSICS, v.114, no.7
JOURNAL OF APPLIED PHYSICS
114
7
scie
scopus
000323510900033
2-s2.0-84883288196
Physics, Applied
Physics
Article
SPIN-STATE TRANSITION
RAY-ABSORPTION SPECTROSCOPY
MAGNETIC-PROPERTIES
LACOO3
PEROVSKITES
VALENCE
TEMPERATURE
CONDUCTION
BEHAVIOR
SPECTRA
Perovskite transition metal oxides
x-ray
absorption near edge spectroscopy
Electronic structure