Structural, morphological and dielectric investigation of spinel chromite (XCr2O4, X = Zn, Mn, Cu & Fe) nanoparticles

The nature of engineering technique has a significant effect on the particle size, particle distribution and thus affects the morphological, electrical and dielectric properties of the materials. In this work, ZnCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 and FeCr 2 O 4 nanoparticles have been synthesized us...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2019-10, Vol.30 (19), p.17623-17629
Main Authors: Shafqat, Muhammad Burhan, Ali, Muhammad, Atiq, Shahid, Ramay, Shahid M., Shaikh, Hamid M., Naseem, Shahzad
Format: Article
Language:English
Subjects:
Characterization and Evaluation of Materials
Chemical synthesis
Chemistry and Materials Science
Chromite
Copper
Crystal lattices
Crystal structure
Current carriers
Dielectric properties
Dielectric strength
Electrical resistivity
Emission analysis
Field emission microscopy
Frequency ranges
Grains
Hopping conduction
Iron
Lattice parameters
Manganese
Materials Science
Morphology
Nanoparticles
Optical and Electronic Materials
Organic chemistry
Particle size distribution
Porosity
Sol-gel processes
Spinel
Zinc
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Summary:The nature of engineering technique has a significant effect on the particle size, particle distribution and thus affects the morphological, electrical and dielectric properties of the materials. In this work, ZnCr 2 O 4 , MnCr 2 O 4 , CuCr 2 O 4 and FeCr 2 O 4 nanoparticles have been synthesized using wet chemical based sol–gel auto-combustion method. The crystal structure, lattice constant, unit cell volume, X-ray density and porosity of the calcined powder samples were determined from the data obtained from X-ray diffractometer. Morphology, grains size and distribution of the grains were analyzed using field emission scanning electron microscopy. Dielectric response of the samples was checked in the frequency range of 20 Hz to 20 MHz. The analysis of real and imaginary dielectric constant and tangent loss revealed a non-linear dielectric behavior of the spinel oxides. A strong frequency dependent response of different electroactive regions was found by impedance spectroscopy. Hopping of charge carriers in the conduction mechanism of spinel chromites was analyzed from the variation of ac conductivity with frequency.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-019-02111-4