| Frequency and Temperature dependent Dielectric Relaxation
and AC Conductivity of Zn1–xEuxO (x = 0, 0.01, 0.05, 0.1)
Nanomaterials obtained by Solution Combustion Technique |
Nityanand Choudhary
Pages : 55-64
DOI: 10.1080/0371750X.2026.2636842 |
| Abstract |
| Zn1–xEuxO (x = 0, 0.01, 0.05 and 0.1) nanomaterials were successfully synthesized
via the solution combustion technique and their frequency, temperature-dependent
dielectric relaxation and AC conductivity were systematically investigated. X-ray
diffraction and Raman scattering confirmed the formation of a single-phase
hexagonal wurtzite ZnO structure for all compositions. Thermogravimetry and
differential thermal analysis indicated thermal stability of the synthesized samples
beyond ~500oC. Transmission electron microscopy revealed nearly spherical
nanoparticles with an average size of ~20 nm for the 5% Eu-doped ZnO sample.
Dielectric parameters including dielectric constant (), dielectric loss (), loss
tangent (tan ), and AC conductivity (ac) were measured over a frequency range
of 50 kHz-5 MHz and a temperature range of 100o
-400oC. All samples exhibited a
decrease in , , tan and ac with increasing frequency, attributed to space-charge
and dipolar polarization effects. A clear shift of dielectric relaxation (transition
temperature) toward higher temperatures with increasing Eu concentration was
observed, indicating enhanced defect-mediated polarization and charge carrier
dynamics. These results demonstrate that Eu doping effectively modifies the
dielectric and electrical behaviour of ZnO nanomaterials, making them promising
candidates for advanced dielectric and electronic applications. |
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