The relationship of oxygen content and Tc in Tl0.5Pb0.5Sr2CuO5±δ

M. H. Pan; M. Greenblatt

doi:10.1016/0921-4534(91)90698-X

The relationship of oxygen content and T_c in Tl_0.5Pb_0.5Sr₂CuO_5±δ

M. H. Pan, M. Greenblatt

School of Arts and Sciences, Chemistry & Chemical Biology

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Polycrystalline samples of pure Tl_1-xPb_xSr₂CuO_{5± δ} with 0.4 ≤ x ≤ 0.5 have been prepared. Samples of Tl_0.5Pb_0.5Sr₂Cu0_5±δ which are quenched from ≈850°C to room temperature are tetragonal (P4/mmm) with a=3.736, c=9.022 A ̊ and bulk super-conducting with a T_c^onset ≈ 60 K. Samples of Tl_0.5Pb_0.5Sr₂Cu0_5±δ quenched from 900°C into liquid nitrogen are semiconducting, which transform to a metallic state upon annealing in air at ≈500°C. Both the semiconducting and metallic phases form with tetragonal P4/mmm symmetry. Thermogravimetric analyses and X-ray data indicate that small variations in the oxygen content are responsible for the dramatic changes in the physical properties.

Original language	English (US)
Pages (from-to)	80-86
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	176
Issue number	1-3
DOIs	https://doi.org/10.1016/0921-4534(91)90698-X
State	Published - May 15 1991

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/0921-4534(91)90698-X

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title = "The relationship of oxygen content and Tc in Tl0.5Pb0.5Sr2CuO5±δ",

abstract = "Polycrystalline samples of pure Tl1-xPbxSr2CuO5± δ with 0.4 ≤ x ≤ 0.5 have been prepared. Samples of Tl0.5Pb0.5Sr2Cu05±δ which are quenched from ≈850°C to room temperature are tetragonal (P4/mmm) with a=3.736, c=9.022 A ̊ and bulk super-conducting with a Tconset ≈ 60 K. Samples of Tl0.5Pb0.5Sr2Cu05±δ quenched from 900°C into liquid nitrogen are semiconducting, which transform to a metallic state upon annealing in air at ≈500°C. Both the semiconducting and metallic phases form with tetragonal P4/mmm symmetry. Thermogravimetric analyses and X-ray data indicate that small variations in the oxygen content are responsible for the dramatic changes in the physical properties.",

author = "Pan, {M. H.} and M. Greenblatt",

note = "Funding Information: The authors thank Dr. Shu Li, K.V. Ramanuja-chary and Robert Fuller for helpful discussions. This work was supported in part by the Office of Naval Research and by the National Science Foundation-Solid State Chemistry Program DMR-87-14072.",

year = "1991",

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doi = "10.1016/0921-4534(91)90698-X",

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AU - Pan, M. H.

AU - Greenblatt, M.

N1 - Funding Information: The authors thank Dr. Shu Li, K.V. Ramanuja-chary and Robert Fuller for helpful discussions. This work was supported in part by the Office of Naval Research and by the National Science Foundation-Solid State Chemistry Program DMR-87-14072.

PY - 1991/5/15

Y1 - 1991/5/15

N2 - Polycrystalline samples of pure Tl1-xPbxSr2CuO5± δ with 0.4 ≤ x ≤ 0.5 have been prepared. Samples of Tl0.5Pb0.5Sr2Cu05±δ which are quenched from ≈850°C to room temperature are tetragonal (P4/mmm) with a=3.736, c=9.022 A ̊ and bulk super-conducting with a Tconset ≈ 60 K. Samples of Tl0.5Pb0.5Sr2Cu05±δ quenched from 900°C into liquid nitrogen are semiconducting, which transform to a metallic state upon annealing in air at ≈500°C. Both the semiconducting and metallic phases form with tetragonal P4/mmm symmetry. Thermogravimetric analyses and X-ray data indicate that small variations in the oxygen content are responsible for the dramatic changes in the physical properties.

AB - Polycrystalline samples of pure Tl1-xPbxSr2CuO5± δ with 0.4 ≤ x ≤ 0.5 have been prepared. Samples of Tl0.5Pb0.5Sr2Cu05±δ which are quenched from ≈850°C to room temperature are tetragonal (P4/mmm) with a=3.736, c=9.022 A ̊ and bulk super-conducting with a Tconset ≈ 60 K. Samples of Tl0.5Pb0.5Sr2Cu05±δ quenched from 900°C into liquid nitrogen are semiconducting, which transform to a metallic state upon annealing in air at ≈500°C. Both the semiconducting and metallic phases form with tetragonal P4/mmm symmetry. Thermogravimetric analyses and X-ray data indicate that small variations in the oxygen content are responsible for the dramatic changes in the physical properties.

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The relationship of oxygen content and T_c in Tl_0.5Pb_0.5Sr₂CuO_5±δ

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