Investigation of variable range hopping and dielectric relaxation in GdCrO3 orthochromite perovskites

This study investigates the structural, electrical, and dielectric properties of GdCrO3 (GCO) compounds. X-ray diffraction analysis confirmed the formation of the perovskite phase of GCO, crystallizing with the Pbnm space group. Scanning electron microscopy (SEM) was employed to examine the morpholo...

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Bibliographic Details
Published in:RSC advances 2024-11, Vol.14 (49), p.36161-36172
Main Authors: Mohamed Youssef Gneber, Elhamdi, Imen, Messoudi, Jalel, Dhahri, Radhia, Sahnoune, Foudil, Mosbah Jemmali, Hussein, Magdy, Dhahri, Essebti, Benilde Faria Oliveira Costa
Format: Article
Language:English
Subjects:
Carrier mobility
Chemical composition
Chemistry
Conduction heating
Crystal defects
Current carriers
Dielectric loss
Dielectric properties
Dielectric relaxation
Electrical measurement
Electrical resistivity
Electron microscopy
Grain boundaries
Homogeneity
Hopping conduction
Microscopy
Morphology
Perovskites
Temperature dependence
Thermal analysis
Valence
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Summary:This study investigates the structural, electrical, and dielectric properties of GdCrO3 (GCO) compounds. X-ray diffraction analysis confirmed the formation of the perovskite phase of GCO, crystallizing with the Pbnm space group. Scanning electron microscopy (SEM) was employed to examine the morphology and chemical composition of the powder, ensuring compound homogeneity, while transmission electron microscopy (TEM) provided insights into the internal structure and finer morphology of the GCO sample. Electrical measurements revealed that GCO exhibits semiconductor behavior, with a notable increase in conductivity as temperature rises, attributed to enhanced charge carrier mobility and hopping conduction mechanisms. Dielectric analysis demonstrated significant frequency-dependent behavior, characterized by various polarization effects and relaxation phenomena. GCO is a promising material for energy storage due to its giant permittivity and low energy loss. The activation energies derived from the electrical and dielectric measurements indicate higher resistance within the grains compared to the grain boundaries, suggesting complex conduction processes. Additionally, the dielectric loss spectra revealed substantial losses, likely due to defect states such as oxygen vacancies and mixed valence states, indicating a highly disordered material. These comprehensive insights into the structural and functional properties of GCO highlight its potential applications in electronic and electrical devices where controlled conductivity and dielectric properties are crucial.
ISSN:2046-2069
2046-2069
DOI:10.1039/d4ra06104g