Investigation of the physical properties of (Cu0.5Tl0.5)Ba2Ca2Cu3O10-δ impregnated with mono cobalt(II)-substituted Undecatungstosilicate Nanoparticles
A series of (Cu 0.5 Tl 0.5 )Ba 2 Ca 2 Cu 3 O 10-δ superconducting samples impregnated with different percentage additions of potassium salt {CoSiW 11 } x nanoparticles ( x = 0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.12 wt.%) were prepared using a single-step solid-state reaction technique at ambient...
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| Published in | Applied physics. A, Materials science & processing Vol. 126; no. 12 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.12.2020
|
| Subjects | |
| Online Access | Get full text |
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| Summary: | A series of (Cu
0.5
Tl
0.5
)Ba
2
Ca
2
Cu
3
O
10-δ
superconducting samples impregnated with different percentage additions of potassium salt {CoSiW
11
}
x
nanoparticles (
x
= 0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.12 wt.%) were prepared using a single-step solid-state reaction technique at ambient pressure. These samples were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) to study their structures, construction of the synthesized samples and elemental composition, respectively. XRD studies indicate that the tetragonal structure of (Cu
0
.
5
Tl
0
.
5
)-1223 phase has not changed by the addition of {CoSiW
11
} nanoparticles the same as for the values of lattice parameters
a
and
c
, where they show a non-remarkable change. The relative volume fraction of (CuTl)-1223 phase record a maximum value for
x
= 0.02 wt.%. The formation of (CuTl)-1223 phase matches the presence of rectangular-shaped plates seen in SEM images. The enhancement of these plates after the addition of {CoSiW
11
} nanoparticles up to
x
= 0.02 wt.% agreed with the measurements of relative volume fraction. The mass percentage of all elements was measured using the EDX technique, which shows the distribution composition of both superconductor and nanoparticle compounds. Vibrational mode analyses of oxygen were accomplished via Fourier transform infrared (FTIR) spectroscopy in (CuTl)-1223 phase impregnated with {CoSiW
11
} nanoparticles. The O
δ
oxygen modes observed are almost unaltered while the other oxygen modes of planar CuO
2
are slightly softened and hardened. Superconducting transition temperature (
T
c
) and critical current density (
J
c
) were determined from the electrical resistivity and
I–V
measurements, respectively. The results indicate an increase in the
T
c
values from 125 K for the pure sample to 132 K for
x
= 0.02 wt.% impregnated samples, while a decrease in the
J
c
values is observed upon increasing ‘
x
’ value from
x
= 0.00 up to 0.12 wt.%. The suppression of these electrical superconducting parameters for
x
> 0.02 wt.% may be due to an increase of weak links' connectivity among the grain boundaries and growth of impurity phases that affect the formation of (CuTl)-1223 superconductor phase. The fluctuation-induced conductivity (FIC) analysis has been done in the light of the Aslamasov–Larkin (AL) theory to study the fluctuation conductivity
Δσ
above
T
c
as a function of reduced temperature for (CoSiW
11
)
x
/(CuTl)-1223 superconductor. The results show four non-identical fluctuation regions that are short-wave (Sw), two-dimensional (2D), three-dimensional (3D) and critical (Cr). The zero-temperature coherence length (
ξ
c
(
0
)
)
,
the effective layer thickness of the two-dimensional system (
d
), inter-layer coupling (
I
), Fermi velocity (
v
F
) and Fermi energy (
E
F
) were evaluated as a function of ‘
x
’ addition from FIC analysis of the samples and then correlated to the superconductivity order parameters. The superconducting parameters were increased upon the addition of {CoSiW
11
} nanoparticles. |
|---|---|
| ISSN: | 0947-8396 1432-0630 |
| DOI: | 10.1007/s00339-020-04083-3 |