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Zinc (Zn) nanoparticles and (Cu0.5Tl0.5)Ba2Ca2Cu3O10-δ (CuTl-1223) superconducting phase were prepared separately by sol–gel and solid-state reaction methods, respectively. Zn nanoparticles were added in CuTl-1223 superconducting matrix with different weight percentage during the final sintering process to obtain (Zn)x/CuTl-1223 (x = 0–4 wt%) nanoparticle–superconductor composites. The effect of Zn nanoparticles on structural, morphological, superconducting, and dielectric properties of CuTl-1223 phase was investigated. The addition of these Zn nanoparticles has not affected the crystal structure of host CuTl-1223 superconducting phase. Superconducting properties were enhanced after the addition of Zn nanoparticles up to certain optimum content (i.e., x = 1 wt%), which were due to improved inter-grain connectivity by healing up of micro-cracks and reduction of defects like oxygen deficiencies, etc. The activation energy (U) was increased after the addition of Zn nanoparticles in CuTl-1223 phase. The dielectric properties of these samples (i.e., dielectric constant, dielectric loss) were determined by experimentally measured capacitance (C) and conductance (G) as a function of frequency at room temperature. The addition of metallic Zn nanoparticles in CuTl-1223 matrix has overall suppressed the dielectric parameters of (Zn)x/CuTl-1223 nanoparticle– superconductor composites. The metallic Zn nanoparticles played a significant role in inter-grain couplings by filling the voids and pores.


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Dielectric properties of (Zn)x/CuTl-1223 nanoparticle–superconductor composites

Show Author's information M. MUMTAZa( )Liaqat ALIaShoaib AZEEMaSaad ULLAHaG. HUSSAINaM. W. RABBANIaAbdul JABBARbK. NADEEMa
Materials Research Laboratory, Department of Physics, FBAS, International Islamic University (IIU), Islamabad 44000, Pakistan
Department of Physics, Ghazi University, Dera Ghazi Khan 32200, Pakistan

Abstract

Zinc (Zn) nanoparticles and (Cu0.5Tl0.5)Ba2Ca2Cu3O10-δ (CuTl-1223) superconducting phase were prepared separately by sol–gel and solid-state reaction methods, respectively. Zn nanoparticles were added in CuTl-1223 superconducting matrix with different weight percentage during the final sintering process to obtain (Zn)x/CuTl-1223 (x = 0–4 wt%) nanoparticle–superconductor composites. The effect of Zn nanoparticles on structural, morphological, superconducting, and dielectric properties of CuTl-1223 phase was investigated. The addition of these Zn nanoparticles has not affected the crystal structure of host CuTl-1223 superconducting phase. Superconducting properties were enhanced after the addition of Zn nanoparticles up to certain optimum content (i.e., x = 1 wt%), which were due to improved inter-grain connectivity by healing up of micro-cracks and reduction of defects like oxygen deficiencies, etc. The activation energy (U) was increased after the addition of Zn nanoparticles in CuTl-1223 phase. The dielectric properties of these samples (i.e., dielectric constant, dielectric loss) were determined by experimentally measured capacitance (C) and conductance (G) as a function of frequency at room temperature. The addition of metallic Zn nanoparticles in CuTl-1223 matrix has overall suppressed the dielectric parameters of (Zn)x/CuTl-1223 nanoparticle– superconductor composites. The metallic Zn nanoparticles played a significant role in inter-grain couplings by filling the voids and pores.

Keywords:

(Zn)x/CuTl-1223 nanoparticle–superconductor composites, dielectric properties, activation energy
Received: 25 January 2016 Revised: 11 March 2016 Accepted: 16 March 2016 Published: 14 June 2016 Issue date: June 2021
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Publication history
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Publication history

Received: 25 January 2016
Revised: 11 March 2016
Accepted: 16 March 2016
Published: 14 June 2016
Issue date: June 2021

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© The author(s) 2016

Acknowledgements

Higher Education Commission (HEC) of Pakistan is acknowledged for financial support through Project No. 20-1482/R&D/09-1472. Authors are also highly thankful to Prof. Xiang-Gang Qiu, Beijing National Laboratory of Condensed Matter Physics, Institute of Physics (IOP), Chinese Academy of Sciences (CAS), Beijing, China, for providing the characterization facilities.

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