Influence of reaction time, quenching and room aging in lead doped BiCaSrCuO high temperature superconductors

M. Muralidhar; D. Mangapathi Rao; V. Hari Babu

doi:10.1016/0254-0584(91)90126-F

Influence of reaction time, quenching and room aging in lead doped BiCaSrCuO high temperature superconductors

M. Muralidhar, D. Mangapathi Rao, V. Hari Babu

研究成果: Article › 査読

9 被引用数 (Scopus)

抄録

Pure and lead doped BiCaSrCuO (2223) compounds have been prepared by solid state reaction at 850°C. In undoped sample the T_c (zero) has been observed at 79K where as in Bi_1.75Pb_0.25Ca₂Sr₂Cu₃O_y T_c was obtained at 107K. Increasing the reaction time and rapidly quenching the samples by immersing them in liquid nitrogen, resulted in decrease of T_c. In rapidly quenched samples stepped resistive transitions have been observed. Aging at room temperature over long periods (~Two years) also showed a decrease in T_c and growth of low T_c (2122) phase. Heat treatment and oxygen annealing recovered the high T_c (2223) phase. The growth of low T_c (2122) and high T_c (2223) phase and their inter relationship have been explained.

本文言語	English
ページ（範囲）	297-305
ページ数	9
ジャーナル	Materials Chemistry and Physics
巻	27
号	3
DOI	https://doi.org/10.1016/0254-0584(91)90126-F
出版ステータス	Published - 1991 3
外部発表	はい

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1016/0254-0584(91)90126-F

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引用スタイル

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abstract = "Pure and lead doped BiCaSrCuO (2223) compounds have been prepared by solid state reaction at 850°C. In undoped sample the Tc (zero) has been observed at 79K where as in Bi1.75Pb0.25Ca2Sr2Cu3 Oy Tc was obtained at 107K. Increasing the reaction time and rapidly quenching the samples by immersing them in liquid nitrogen, resulted in decrease of Tc. In rapidly quenched samples stepped resistive transitions have been observed. Aging at room temperature over long periods (~Two years) also showed a decrease in Tc and growth of low Tc (2122) phase. Heat treatment and oxygen annealing recovered the high Tc (2223) phase. The growth of low Tc (2122) and high Tc (2223) phase and their inter relationship have been explained.",

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N2 - Pure and lead doped BiCaSrCuO (2223) compounds have been prepared by solid state reaction at 850°C. In undoped sample the Tc (zero) has been observed at 79K where as in Bi1.75Pb0.25Ca2Sr2Cu3 Oy Tc was obtained at 107K. Increasing the reaction time and rapidly quenching the samples by immersing them in liquid nitrogen, resulted in decrease of Tc. In rapidly quenched samples stepped resistive transitions have been observed. Aging at room temperature over long periods (~Two years) also showed a decrease in Tc and growth of low Tc (2122) phase. Heat treatment and oxygen annealing recovered the high Tc (2223) phase. The growth of low Tc (2122) and high Tc (2223) phase and their inter relationship have been explained.

AB - Pure and lead doped BiCaSrCuO (2223) compounds have been prepared by solid state reaction at 850°C. In undoped sample the Tc (zero) has been observed at 79K where as in Bi1.75Pb0.25Ca2Sr2Cu3 Oy Tc was obtained at 107K. Increasing the reaction time and rapidly quenching the samples by immersing them in liquid nitrogen, resulted in decrease of Tc. In rapidly quenched samples stepped resistive transitions have been observed. Aging at room temperature over long periods (~Two years) also showed a decrease in Tc and growth of low Tc (2122) phase. Heat treatment and oxygen annealing recovered the high Tc (2223) phase. The growth of low Tc (2122) and high Tc (2223) phase and their inter relationship have been explained.

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