AC Conduction Mechanism in (Cu)x/(CuTl)‑1223 Nanoparticles–Superconductor Composites

Irfan, Qasim (2020) AC Conduction Mechanism in (Cu)x/(CuTl)‑1223 Nanoparticles–Superconductor Composites. Journal of Low temperature Physics.

Text 7. JLTP Irfan Qasim ACConductionMechanismInCuXCuTl.pdf - Published Version Restricted to Registered users only until 5 March 2021. Download (9MB)

Abstract

Copper (Cu) nanoparticles (NPs) were prepared by sol–gel process, and superconducting
(
Cu0.5Tl0.5)Ba2Ca2Cu3O10−δ {(CuTl)-1223} phase was synthesized by conventional
solid-state reaction. The desired (Cu)x/(CuTl)-1223, x = 0–4.0 wt% composites,
were obtained by adding Cu NPs in superconducting (CuTl)-1223 phase.
These composites were characterized by X-ray diffraction, DC-resistivity versus
temperature (R–T) and AC conduction measurements. The tetragonal crystal structure
with P4/mmm space group of the host superconducting (CuTl)-1223 phase
remained dominant after the addition of Cu NPs. The zero-resistivity critical temperature
Tc(0) (K) was increased, and normal state resistivity was decreased after addition
of Cu NPs in CuTl-1223 phase. The frequency- and temperature-dependent AC
conduction properties of (Cu)x/(CuTl)-1223 composites were explored via dielectric,
impedance and electric modulus measurements. The dielectric constant (ɛr / , ɛr
//)
and loss tangent (tanδ) were suppressed, while AC conductivity (σac) was improved
with the addition of Cu NPs in (CuTl)-1223 phase. Comparatively, the capacitance
associated with grain boundaries regions was found to be greater than the capacitance
associated with grain regions. The capacitive behavior of the grain boundaries
was decreased, while that of the grains was increased with increasing operating
temperature for all these composite samples. The shifting of peaks in imaginary part
of the electric modulus (M//) versus frequency (f) spectra toward lower frequency
regime with increasing Cu NPs contents in superconducting (CuTl)-1223 phase is
witnessed for the existence of non-Debye relaxation in the material.

Item Type:	Article
Subjects:	Q Science > QC Physics
Divisions:	Faculty of Engineering and Applied Sciences (FEAS) > Department of Basic Sciences Faisalabad
Depositing User:	Irfan Qasim Qasim
Date Deposited:	08 Sep 2020 06:35
Last Modified:	08 Sep 2020 06:35
URI:	http://research.riphah.edu.pk/id/eprint/271

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