Effects of Cr, Ta and Pb substitutions on phase formation and superconductivity of Tl1212 ceramics

A. K. Yahya, M. I. Yusof, B. Musa, W. F. Abdullah, Z. Zamri, Mohammad Hafizuddin Jumali

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Abstract

Effects of Cr, Ta and Pb substitutions for Sr/Tl on phase formation and superconductivity of Tl0.8 Bi0.2 Sr2-x CrxCa0.9Y0.1Cu2 O7, Tl0.9Bi0.1Sr2.y TayCa0.9Y0.1Cu2 O7 and Tl1-zPbzSr1.8 Sb0.2CaCu2O7, ceramics were investigated. Powder X-ray diffraction patterns for the three series showed major 1212 phase with 1201 phase as the minor phase. Electrical (dc) resistance measurements showed that the elemental substitutions at Sr site for Tl0.8Bi0.2Sr3-x CrxCa0.3Y0.1Cu2 O7, (x = 0-0.3) and Tl0.3Bi0.1 Sr2.yTayCa0.9Y0.1 Cu2O7 (y = 0-0.3) series induced metal-insulator transition in normal state behavior accompanied by deterioration of superconductivity. On the other hand, Tl1-zPbz Sr1.8Sb0.2CaCu2O7(z = 0.1-0.6) series showed metallic normal state behaviors and enhancement in Tczero from 26 K (z = 0.1) to a maximum of 80 K (z = 0.5). Results of structural-investigation and phase formation using powder X-ray diffraction are reported and effects of Cr, Ta and Pb substitutions on superconductivity of Tl1212 are discussed in terms of ionic radius of substituting elements and the concept of average Cu valence.

Original languageEnglish
Pages (from-to)1007-1013
Number of pages7
JournalJournal of Applied Sciences
Volume8
Issue number6
Publication statusPublished - 2008
Externally publishedYes

Fingerprint

superconductivity
ceramics
substitutes
electrical resistance
deterioration
x rays
diffraction patterns
insulators
valence
radii
augmentation
diffraction
metals

Keywords

  • Cu valence
  • Oxide superconductors
  • Substition effects
  • Tl1212
  • Transition temperature

ASJC Scopus subject areas

  • General

Cite this

Effects of Cr, Ta and Pb substitutions on phase formation and superconductivity of Tl1212 ceramics. / Yahya, A. K.; Yusof, M. I.; Musa, B.; Abdullah, W. F.; Zamri, Z.; Jumali, Mohammad Hafizuddin.

In: Journal of Applied Sciences, Vol. 8, No. 6, 2008, p. 1007-1013.

Research output: Contribution to journalArticle

Yahya, AK, Yusof, MI, Musa, B, Abdullah, WF, Zamri, Z & Jumali, MH 2008, 'Effects of Cr, Ta and Pb substitutions on phase formation and superconductivity of Tl1212 ceramics', Journal of Applied Sciences, vol. 8, no. 6, pp. 1007-1013.
Yahya, A. K. ; Yusof, M. I. ; Musa, B. ; Abdullah, W. F. ; Zamri, Z. ; Jumali, Mohammad Hafizuddin. / Effects of Cr, Ta and Pb substitutions on phase formation and superconductivity of Tl1212 ceramics. In: Journal of Applied Sciences. 2008 ; Vol. 8, No. 6. pp. 1007-1013.
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T1 - Effects of Cr, Ta and Pb substitutions on phase formation and superconductivity of Tl1212 ceramics

AU - Yahya, A. K.

AU - Yusof, M. I.

AU - Musa, B.

AU - Abdullah, W. F.

AU - Zamri, Z.

AU - Jumali, Mohammad Hafizuddin

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N2 - Effects of Cr, Ta and Pb substitutions for Sr/Tl on phase formation and superconductivity of Tl0.8 Bi0.2 Sr2-x CrxCa0.9Y0.1Cu2 O7, Tl0.9Bi0.1Sr2.y TayCa0.9Y0.1Cu2 O7 and Tl1-zPbzSr1.8 Sb0.2CaCu2O7, ceramics were investigated. Powder X-ray diffraction patterns for the three series showed major 1212 phase with 1201 phase as the minor phase. Electrical (dc) resistance measurements showed that the elemental substitutions at Sr site for Tl0.8Bi0.2Sr3-x CrxCa0.3Y0.1Cu2 O7, (x = 0-0.3) and Tl0.3Bi0.1 Sr2.yTayCa0.9Y0.1 Cu2O7 (y = 0-0.3) series induced metal-insulator transition in normal state behavior accompanied by deterioration of superconductivity. On the other hand, Tl1-zPbz Sr1.8Sb0.2CaCu2O7(z = 0.1-0.6) series showed metallic normal state behaviors and enhancement in Tczero from 26 K (z = 0.1) to a maximum of 80 K (z = 0.5). Results of structural-investigation and phase formation using powder X-ray diffraction are reported and effects of Cr, Ta and Pb substitutions on superconductivity of Tl1212 are discussed in terms of ionic radius of substituting elements and the concept of average Cu valence.

AB - Effects of Cr, Ta and Pb substitutions for Sr/Tl on phase formation and superconductivity of Tl0.8 Bi0.2 Sr2-x CrxCa0.9Y0.1Cu2 O7, Tl0.9Bi0.1Sr2.y TayCa0.9Y0.1Cu2 O7 and Tl1-zPbzSr1.8 Sb0.2CaCu2O7, ceramics were investigated. Powder X-ray diffraction patterns for the three series showed major 1212 phase with 1201 phase as the minor phase. Electrical (dc) resistance measurements showed that the elemental substitutions at Sr site for Tl0.8Bi0.2Sr3-x CrxCa0.3Y0.1Cu2 O7, (x = 0-0.3) and Tl0.3Bi0.1 Sr2.yTayCa0.9Y0.1 Cu2O7 (y = 0-0.3) series induced metal-insulator transition in normal state behavior accompanied by deterioration of superconductivity. On the other hand, Tl1-zPbz Sr1.8Sb0.2CaCu2O7(z = 0.1-0.6) series showed metallic normal state behaviors and enhancement in Tczero from 26 K (z = 0.1) to a maximum of 80 K (z = 0.5). Results of structural-investigation and phase formation using powder X-ray diffraction are reported and effects of Cr, Ta and Pb substitutions on superconductivity of Tl1212 are discussed in terms of ionic radius of substituting elements and the concept of average Cu valence.

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KW - Substition effects

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