Effects of elemental substitution involving V and Cr on superconductivity of (Tl,Bi)Sr2(Ca,Y)Cu2O7 ceramics

N. A. Hamid, B. Musa, A. K. Yahya, Mohammad Hafizuddin Jumali, Roslan Abd. Shukor

Research output: Contribution to journalArticle

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Abstract

Cr and V substituted Tl1212 type phase high temperature superconductors with nominal starting compositions Tl0.9Bi0.1Sr 2-xCrxCa0.9Y0.1Cu2O 7 (x=0-0.5) and Tl0.9Bi0.1Sr 2-yVyCa0.9Y0.1Cu2O 7 (y=0-0.5) have been prepared and characterized. Powder X-ray diffraction patterns showed all samples consist of major 1212 phase and minor 1201 phase. For Tl0.9Bi0.1Sr2-xCr xCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (x=0-0.3) to semi-metallic behavior (x=0.4) and semiconductor-like behavior (x=0.5). Tczero gradually increased from 50K (x=0) to a maximum value of 78K at x=0.3 before decreasing with further Cr substitution. The x=0.5 sample was non-superconducting. For Tl0.9Bi0.1Sr2-yV yCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (y=0-0.3) to semi-metallic behavior (y=0.4) and semiconductor-like behavior (y=0.5). Tczero increased from 50K (y=0) to a maximum value of 76K (y=0.2) before decreasing to 62K (y=0.3). Samples with y=0.4 and 0.5 were non-superconducting. The effects of Cr and V substitutions are discussed in terms of ionic radius of dopants and the concept of average Cu valence.

Original languageEnglish
Pages (from-to)1585-1589
Number of pages5
JournalCeramics International
Volume30
Issue number7
DOIs
Publication statusPublished - 2004

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Superconductivity
Substitution reactions
Semiconductor materials
High temperature superconductors
Diffraction patterns
Doping (additives)
Powders
X rays
Chemical analysis

Keywords

  • C. Electrical properties
  • C. Superconductivity
  • D. Oxide superconductors

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Effects of elemental substitution involving V and Cr on superconductivity of (Tl,Bi)Sr2(Ca,Y)Cu2O7 ceramics. / Hamid, N. A.; Musa, B.; Yahya, A. K.; Jumali, Mohammad Hafizuddin; Abd. Shukor, Roslan.

In: Ceramics International, Vol. 30, No. 7, 2004, p. 1585-1589.

Research output: Contribution to journalArticle

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abstract = "Cr and V substituted Tl1212 type phase high temperature superconductors with nominal starting compositions Tl0.9Bi0.1Sr 2-xCrxCa0.9Y0.1Cu2O 7 (x=0-0.5) and Tl0.9Bi0.1Sr 2-yVyCa0.9Y0.1Cu2O 7 (y=0-0.5) have been prepared and characterized. Powder X-ray diffraction patterns showed all samples consist of major 1212 phase and minor 1201 phase. For Tl0.9Bi0.1Sr2-xCr xCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (x=0-0.3) to semi-metallic behavior (x=0.4) and semiconductor-like behavior (x=0.5). Tczero gradually increased from 50K (x=0) to a maximum value of 78K at x=0.3 before decreasing with further Cr substitution. The x=0.5 sample was non-superconducting. For Tl0.9Bi0.1Sr2-yV yCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (y=0-0.3) to semi-metallic behavior (y=0.4) and semiconductor-like behavior (y=0.5). Tczero increased from 50K (y=0) to a maximum value of 76K (y=0.2) before decreasing to 62K (y=0.3). Samples with y=0.4 and 0.5 were non-superconducting. The effects of Cr and V substitutions are discussed in terms of ionic radius of dopants and the concept of average Cu valence.",
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T1 - Effects of elemental substitution involving V and Cr on superconductivity of (Tl,Bi)Sr2(Ca,Y)Cu2O7 ceramics

AU - Hamid, N. A.

AU - Musa, B.

AU - Yahya, A. K.

AU - Jumali, Mohammad Hafizuddin

AU - Abd. Shukor, Roslan

PY - 2004

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N2 - Cr and V substituted Tl1212 type phase high temperature superconductors with nominal starting compositions Tl0.9Bi0.1Sr 2-xCrxCa0.9Y0.1Cu2O 7 (x=0-0.5) and Tl0.9Bi0.1Sr 2-yVyCa0.9Y0.1Cu2O 7 (y=0-0.5) have been prepared and characterized. Powder X-ray diffraction patterns showed all samples consist of major 1212 phase and minor 1201 phase. For Tl0.9Bi0.1Sr2-xCr xCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (x=0-0.3) to semi-metallic behavior (x=0.4) and semiconductor-like behavior (x=0.5). Tczero gradually increased from 50K (x=0) to a maximum value of 78K at x=0.3 before decreasing with further Cr substitution. The x=0.5 sample was non-superconducting. For Tl0.9Bi0.1Sr2-yV yCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (y=0-0.3) to semi-metallic behavior (y=0.4) and semiconductor-like behavior (y=0.5). Tczero increased from 50K (y=0) to a maximum value of 76K (y=0.2) before decreasing to 62K (y=0.3). Samples with y=0.4 and 0.5 were non-superconducting. The effects of Cr and V substitutions are discussed in terms of ionic radius of dopants and the concept of average Cu valence.

AB - Cr and V substituted Tl1212 type phase high temperature superconductors with nominal starting compositions Tl0.9Bi0.1Sr 2-xCrxCa0.9Y0.1Cu2O 7 (x=0-0.5) and Tl0.9Bi0.1Sr 2-yVyCa0.9Y0.1Cu2O 7 (y=0-0.5) have been prepared and characterized. Powder X-ray diffraction patterns showed all samples consist of major 1212 phase and minor 1201 phase. For Tl0.9Bi0.1Sr2-xCr xCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (x=0-0.3) to semi-metallic behavior (x=0.4) and semiconductor-like behavior (x=0.5). Tczero gradually increased from 50K (x=0) to a maximum value of 78K at x=0.3 before decreasing with further Cr substitution. The x=0.5 sample was non-superconducting. For Tl0.9Bi0.1Sr2-yV yCa0.9Y0.1Cu2O7, normal state resistance changes from metallic behavior (y=0-0.3) to semi-metallic behavior (y=0.4) and semiconductor-like behavior (y=0.5). Tczero increased from 50K (y=0) to a maximum value of 76K (y=0.2) before decreasing to 62K (y=0.3). Samples with y=0.4 and 0.5 were non-superconducting. The effects of Cr and V substitutions are discussed in terms of ionic radius of dopants and the concept of average Cu valence.

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KW - D. Oxide superconductors

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