Phase transformation in Fe2O3 nanoparticles: Electrical properties with local electronic structure

Authors
SumanSharma, VikasDevi, SeemaChahal, SurjeetSingh, Jitendra PalChae, K. H.Kumar, AshokAsokan, K.Kumar, Parmod
Issue Date
2021-11-01
Publisher
ELSEVIER
Citation
PHYSICA B-CONDENSED MATTER, v.620
Abstract
Present work is focused on the study of various physical properties of different phases (alpha & gamma) of Fe2O3 prepared just by varying initial precursors and solvents. Diverse structural and spectroscopic techniques infer growth of a-phase using gelatin (GEL) + deionized water (DI) while mixed (alpha & gamma)phase is obtained with GEL + ethylene glycol (EG) as precursor and solvents in iron nitrate salt. By controlling the properties of the solvent media, we have been able to tune the crystallite size from 26.31 nm (alpha-phase) to 38.87 nm (mixed-phase). The corresponding activation energy for alpha-phase and mixed-phase was calculated using the Arrhenius plot. Dielectric loss and permittivity in both samples exhibited different behaviour with temperature and which can be explained based on their electronic structure studied by the X-ray absorption spectroscopy technique. The interplay of different phases of materials can be achieved just by controlling the synthesis parameters like solvents/precursors or both.
Keywords
IRON-OXIDE NANOPARTICLES; HEMATITE NANOPARTICLES; DIELECTRIC-PROPERTIES; ALPHA-FE2O3 NANOPARTICLES; MAGNETIC-PROPERTIES; FACILE SYNTHESIS; ANODE MATERIALS; THIN-FILMS; FE3O4; GAMMA-FE2O3; IRON-OXIDE NANOPARTICLES; HEMATITE NANOPARTICLES; DIELECTRIC-PROPERTIES; ALPHA-FE2O3 NANOPARTICLES; MAGNETIC-PROPERTIES; FACILE SYNTHESIS; ANODE MATERIALS; THIN-FILMS; FE3O4; GAMMA-FE2O3; Fe2O3; Raman spectroscopy; XAS; Dielectric Properties
ISSN
0921-4526
URI
https://pubs.kist.re.kr/handle/201004/116150
DOI
10.1016/j.physb.2021.413275
Appears in Collections:
KIST Article > 2021
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