Superconducting properties of 1212 phase in (TI, M) Sr2 (Ca1-xCrx)Cu2O7 (M = Zr and Ce)

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Abstract

Samples with nominal starting compositions (Tl0.8M0.2)Sr2(Ca1-xCr x)Cu2O7 (1212) where M = Ce and Zr have been prepared and investigated by the d.c. electrical resistance method and powder X-ray diffraction analyses. Most of the samples showed the 1212 as the major phase and 1201 as the minor phase. Both series of samples showed the highest superconducting onset temperature (Tc) at x = 0.2. Ce was found to be more favourable for the formation of the 1212 phase compared to Zr. The valence state of Zr, estimated by employing previous results of optimum average Cu valence for superconductivity in the 1212 superconductors, is 4+. The importance of ionic radius of the substituted elements and the effect of starting composition on Tc and phase formation are discussed.

Original languageEnglish
Pages (from-to)99-102
Number of pages4
JournalJournal of Materials Science: Materials in Electronics
Volume9
Issue number2
Publication statusPublished - 1998

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Acoustic impedance
Superconductivity
Chemical analysis
X ray powder diffraction
Superconducting materials
valence
electrical resistance
superconductivity
radii
diffraction
Temperature
x rays
temperature

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Superconducting properties of 1212 phase in (TI, M) Sr2 (Ca1-xCrx)Cu2O7 (M = Zr and Ce)",
abstract = "Samples with nominal starting compositions (Tl0.8M0.2)Sr2(Ca1-xCr x)Cu2O7 (1212) where M = Ce and Zr have been prepared and investigated by the d.c. electrical resistance method and powder X-ray diffraction analyses. Most of the samples showed the 1212 as the major phase and 1201 as the minor phase. Both series of samples showed the highest superconducting onset temperature (Tc) at x = 0.2. Ce was found to be more favourable for the formation of the 1212 phase compared to Zr. The valence state of Zr, estimated by employing previous results of optimum average Cu valence for superconductivity in the 1212 superconductors, is 4+. The importance of ionic radius of the substituted elements and the effect of starting composition on Tc and phase formation are discussed.",
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journal = "Journal of Materials Science: Materials in Electronics",
issn = "0957-4522",
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T1 - Superconducting properties of 1212 phase in (TI, M) Sr2 (Ca1-xCrx)Cu2O7 (M = Zr and Ce)

AU - Abd. Shukor, Roslan

AU - Lee, K. H.

PY - 1998

Y1 - 1998

N2 - Samples with nominal starting compositions (Tl0.8M0.2)Sr2(Ca1-xCr x)Cu2O7 (1212) where M = Ce and Zr have been prepared and investigated by the d.c. electrical resistance method and powder X-ray diffraction analyses. Most of the samples showed the 1212 as the major phase and 1201 as the minor phase. Both series of samples showed the highest superconducting onset temperature (Tc) at x = 0.2. Ce was found to be more favourable for the formation of the 1212 phase compared to Zr. The valence state of Zr, estimated by employing previous results of optimum average Cu valence for superconductivity in the 1212 superconductors, is 4+. The importance of ionic radius of the substituted elements and the effect of starting composition on Tc and phase formation are discussed.

AB - Samples with nominal starting compositions (Tl0.8M0.2)Sr2(Ca1-xCr x)Cu2O7 (1212) where M = Ce and Zr have been prepared and investigated by the d.c. electrical resistance method and powder X-ray diffraction analyses. Most of the samples showed the 1212 as the major phase and 1201 as the minor phase. Both series of samples showed the highest superconducting onset temperature (Tc) at x = 0.2. Ce was found to be more favourable for the formation of the 1212 phase compared to Zr. The valence state of Zr, estimated by employing previous results of optimum average Cu valence for superconductivity in the 1212 superconductors, is 4+. The importance of ionic radius of the substituted elements and the effect of starting composition on Tc and phase formation are discussed.

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