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Evolution of Jahn–Teller distortion, transport and dielectric properties with doping in perovskite NdFe1−xMnxO3 (0 ≤ x ≤ 1) compounds
- Source :
- Physical Chemistry Chemical Physics. 18:5316-5323
- Publication Year :
- 2016
- Publisher :
- Royal Society of Chemistry (RSC), 2016.
-
Abstract
- We have carried out dielectric and transport measurements in NdFe1-xMnxO3 (0 ≤ x ≤ 1) series of compounds and studied the variation of activation energy due to a change in Mn concentration. Despite similar ionic radii in Mn(3+) and Fe(3+), large variation is observed in the lattice parameters and a crossover from dynamic to static Jahn-Teller distortion is discernible. The Fe/Mn-O-Fe/Mn bond angle on the ab plane shows an anomalous change with doping. With an increase in the Mn content, the bond angle decreases until x = 0.6; beyond this, it starts rising until x = 0.8 and again falls after that. A similar trend is observed in activation energies estimated from both transport and dielectric relaxation by assuming a small polaron hopping (SPH) model. Impedance spectroscopy measurements delineate grain and grain boundary contributions separately both of which follow the SPH model. Frequency variation of the dielectric constant is in agreement with the modified Debye law from which relaxation dispersion is estimated.
- Subjects :
- Ionic radius
Condensed matter physics
Chemistry
Physics
Jahn–Teller effect
General Physics and Astronomy
02 engineering and technology
Activation energy
Dielectric
021001 nanoscience & nanotechnology
Polaron
01 natural sciences
Dielectric spectroscopy
Molecular geometry
0103 physical sciences
Condensed Matter::Strongly Correlated Electrons
Grain boundary
Physical and Theoretical Chemistry
010306 general physics
0210 nano-technology
Subjects
Details
- ISSN :
- 14639084 and 14639076
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Physical Chemistry Chemical Physics
- Accession number :
- edsair.doi.dedup.....e58c52474a26b2fbe30f008e61bcd506