Effects of alkali metals on the formation of Tl-1212 type phase (Tl0.85Cr0.15)Sr2−xAxCaCu2O7 with A = Li, Na and Rb

J. Nur-Akasyah, Roslan Abd. Shukor

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Abstract

The effects of alkali metals A = Li, Na and Rb on (Tl0.85Cr0.15)Sr2−xAxCaCu2O7 (Tl-1212) superconductors with x = 0–0.1 were studied. The samples were prepared via the solid-state reaction method. X-ray diffraction patterns showed that the formation of Tl-1212 phase was favorable when the ionic radius of the alkali metal was closer to the radius of Tl1+. Ca0.3Sr0.7CuO2 was present as a major or minor phase in some of the samples. Scanning electron micrographs showed that the grain size increased with Li, Na and Rb substitutions. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples with onset transition temperature, Tc onset between 96 and 105 K and zero-resistance temperature, Tc zero between 92 and 99 K. AC susceptibility measurement showed superconducting transition, (Formula presented.) between 92 and 97 K. The peak temperature Tp of the imaginary part of the susceptibility χ″ was the highest for Na and Rb with x = 0.1 samples (Tp = 92 K). The inter-grain critical current density, Jc at Tp for x = 0 sample was Jc (Tp = 68 K) = 14 A cm−2 and for Li substituted sample with x = 0.1, Jc (Tp = 76 K) = 22 A cm−2. This work showed that Rb greatly enhanced the Tl-1212 phase formation due to the proximity of the Rb1+ and Tl1+ ionic radius. Na and Rb improved the transition temperature. Li, Na and Rb improved the inter-grain critical current density and increased the grain size of the samples.

Original languageEnglish
Pages (from-to)1-6
Number of pages6
JournalJournal of Materials Science: Materials in Electronics
DOIs
Publication statusAccepted/In press - 21 Nov 2017

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Alkali Metals
Alkali metals
alkali metals
Superconducting transition temperature
Acoustic impedance
Solid state reactions
Temperature
Diffraction patterns
Superconducting materials
Substitution reactions
radii
critical current
Scanning
grain size
transition temperature
X ray diffraction
current density
Electrons
magnetic permeability
electrical resistance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

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title = "Effects of alkali metals on the formation of Tl-1212 type phase (Tl0.85Cr0.15)Sr2−xAxCaCu2O7 with A = Li, Na and Rb",
abstract = "The effects of alkali metals A = Li, Na and Rb on (Tl0.85Cr0.15)Sr2−xAxCaCu2O7 (Tl-1212) superconductors with x = 0–0.1 were studied. The samples were prepared via the solid-state reaction method. X-ray diffraction patterns showed that the formation of Tl-1212 phase was favorable when the ionic radius of the alkali metal was closer to the radius of Tl1+. Ca0.3Sr0.7CuO2 was present as a major or minor phase in some of the samples. Scanning electron micrographs showed that the grain size increased with Li, Na and Rb substitutions. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples with onset transition temperature, Tc onset between 96 and 105 K and zero-resistance temperature, Tc zero between 92 and 99 K. AC susceptibility measurement showed superconducting transition, (Formula presented.) between 92 and 97 K. The peak temperature Tp of the imaginary part of the susceptibility χ″ was the highest for Na and Rb with x = 0.1 samples (Tp = 92 K). The inter-grain critical current density, Jc at Tp for x = 0 sample was Jc (Tp = 68 K) = 14 A cm−2 and for Li substituted sample with x = 0.1, Jc (Tp = 76 K) = 22 A cm−2. This work showed that Rb greatly enhanced the Tl-1212 phase formation due to the proximity of the Rb1+ and Tl1+ ionic radius. Na and Rb improved the transition temperature. Li, Na and Rb improved the inter-grain critical current density and increased the grain size of the samples.",
author = "J. Nur-Akasyah and {Abd. Shukor}, Roslan",
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AU - Abd. Shukor, Roslan

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N2 - The effects of alkali metals A = Li, Na and Rb on (Tl0.85Cr0.15)Sr2−xAxCaCu2O7 (Tl-1212) superconductors with x = 0–0.1 were studied. The samples were prepared via the solid-state reaction method. X-ray diffraction patterns showed that the formation of Tl-1212 phase was favorable when the ionic radius of the alkali metal was closer to the radius of Tl1+. Ca0.3Sr0.7CuO2 was present as a major or minor phase in some of the samples. Scanning electron micrographs showed that the grain size increased with Li, Na and Rb substitutions. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples with onset transition temperature, Tc onset between 96 and 105 K and zero-resistance temperature, Tc zero between 92 and 99 K. AC susceptibility measurement showed superconducting transition, (Formula presented.) between 92 and 97 K. The peak temperature Tp of the imaginary part of the susceptibility χ″ was the highest for Na and Rb with x = 0.1 samples (Tp = 92 K). The inter-grain critical current density, Jc at Tp for x = 0 sample was Jc (Tp = 68 K) = 14 A cm−2 and for Li substituted sample with x = 0.1, Jc (Tp = 76 K) = 22 A cm−2. This work showed that Rb greatly enhanced the Tl-1212 phase formation due to the proximity of the Rb1+ and Tl1+ ionic radius. Na and Rb improved the transition temperature. Li, Na and Rb improved the inter-grain critical current density and increased the grain size of the samples.

AB - The effects of alkali metals A = Li, Na and Rb on (Tl0.85Cr0.15)Sr2−xAxCaCu2O7 (Tl-1212) superconductors with x = 0–0.1 were studied. The samples were prepared via the solid-state reaction method. X-ray diffraction patterns showed that the formation of Tl-1212 phase was favorable when the ionic radius of the alkali metal was closer to the radius of Tl1+. Ca0.3Sr0.7CuO2 was present as a major or minor phase in some of the samples. Scanning electron micrographs showed that the grain size increased with Li, Na and Rb substitutions. The temperature-dependent electrical resistance measurements showed metallic normal state behavior for all samples with onset transition temperature, Tc onset between 96 and 105 K and zero-resistance temperature, Tc zero between 92 and 99 K. AC susceptibility measurement showed superconducting transition, (Formula presented.) between 92 and 97 K. The peak temperature Tp of the imaginary part of the susceptibility χ″ was the highest for Na and Rb with x = 0.1 samples (Tp = 92 K). The inter-grain critical current density, Jc at Tp for x = 0 sample was Jc (Tp = 68 K) = 14 A cm−2 and for Li substituted sample with x = 0.1, Jc (Tp = 76 K) = 22 A cm−2. This work showed that Rb greatly enhanced the Tl-1212 phase formation due to the proximity of the Rb1+ and Tl1+ ionic radius. Na and Rb improved the transition temperature. Li, Na and Rb improved the inter-grain critical current density and increased the grain size of the samples.

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