Effect of Ca2CuO3 on the formation of (2223) phase in the BiPbSrCaCuO system

K. Nanda Kishore; M. Muralidhar; V. Hari Babu

doi:10.1016/0921-5107(92)90082-K

Effect of Ca₂CuO₃ on the formation of (2223) phase in the BiPbSrCaCuO system

K. Nanda Kishore, M. Muralidhar, V. Hari Babu

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

6 Citations (Scopus)

Abstract

The effect of excess Ca₂CuO₃ on the superconducting properties of Bi_1.7Pb_0.3Sr₂Ca₂Cu₃O_y was investigated through X-ray diffraction (XRD), resistivity and a.c. magnetic susceptibility measurements. The XRD patterns revealed that 2223 is the major phase. The intensities of the peaks corresponding to Ca₂CuO₃ at 2θ=35.1 and 36.3, and those corresponding to the high T_c (2223) phase increased with increasing Ca₂CuO₃ concentration. The T_c(0) values, however, decreased with increasing Ca₂CuO₃ concentration. The real part of the a.c. susceptibility showed a two-step transition and two sets of peaks were observed in χ″ vs. T plots. The first set of peaks were approximately 10 K less than the T_c(0) values, whereas the second set of peaks occured in the temperature range 40-60 K. Both sets of peaks shifted towards lower temperatures with increasing Ca₂CuO₃ concentration. The role of Ca₂CuO₃ in the growth of 2223 phase and the mechanism of energy loss are discussed.

Original language	English
Pages (from-to)	401-407
Number of pages	7
Journal	Materials Science and Engineering B
Volume	14
Issue number	4
DOIs	https://doi.org/10.1016/0921-5107(92)90082-K
Publication status	Published - 1992 Sep 1
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Effect of Ca2CuO3 on the formation of (2223) phase in the BiPbSrCaCuO system",

abstract = "The effect of excess Ca2CuO3 on the superconducting properties of Bi1.7Pb0.3Sr2Ca2Cu3 Oy was investigated through X-ray diffraction (XRD), resistivity and a.c. magnetic susceptibility measurements. The XRD patterns revealed that 2223 is the major phase. The intensities of the peaks corresponding to Ca2CuO3 at 2θ=35.1 and 36.3, and those corresponding to the high Tc (2223) phase increased with increasing Ca2CuO3 concentration. The Tc(0) values, however, decreased with increasing Ca2CuO3 concentration. The real part of the a.c. susceptibility showed a two-step transition and two sets of peaks were observed in χ″ vs. T plots. The first set of peaks were approximately 10 K less than the Tc(0) values, whereas the second set of peaks occured in the temperature range 40-60 K. Both sets of peaks shifted towards lower temperatures with increasing Ca2CuO3 concentration. The role of Ca2CuO3 in the growth of 2223 phase and the mechanism of energy loss are discussed.",

author = "Kishore, {K. Nanda} and M. Muralidhar and Babu, {V. Hari}",

year = "1992",

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T1 - Effect of Ca2CuO3 on the formation of (2223) phase in the BiPbSrCaCuO system

AU - Kishore, K. Nanda

AU - Muralidhar, M.

AU - Babu, V. Hari

PY - 1992/9/1

Y1 - 1992/9/1

N2 - The effect of excess Ca2CuO3 on the superconducting properties of Bi1.7Pb0.3Sr2Ca2Cu3 Oy was investigated through X-ray diffraction (XRD), resistivity and a.c. magnetic susceptibility measurements. The XRD patterns revealed that 2223 is the major phase. The intensities of the peaks corresponding to Ca2CuO3 at 2θ=35.1 and 36.3, and those corresponding to the high Tc (2223) phase increased with increasing Ca2CuO3 concentration. The Tc(0) values, however, decreased with increasing Ca2CuO3 concentration. The real part of the a.c. susceptibility showed a two-step transition and two sets of peaks were observed in χ″ vs. T plots. The first set of peaks were approximately 10 K less than the Tc(0) values, whereas the second set of peaks occured in the temperature range 40-60 K. Both sets of peaks shifted towards lower temperatures with increasing Ca2CuO3 concentration. The role of Ca2CuO3 in the growth of 2223 phase and the mechanism of energy loss are discussed.

AB - The effect of excess Ca2CuO3 on the superconducting properties of Bi1.7Pb0.3Sr2Ca2Cu3 Oy was investigated through X-ray diffraction (XRD), resistivity and a.c. magnetic susceptibility measurements. The XRD patterns revealed that 2223 is the major phase. The intensities of the peaks corresponding to Ca2CuO3 at 2θ=35.1 and 36.3, and those corresponding to the high Tc (2223) phase increased with increasing Ca2CuO3 concentration. The Tc(0) values, however, decreased with increasing Ca2CuO3 concentration. The real part of the a.c. susceptibility showed a two-step transition and two sets of peaks were observed in χ″ vs. T plots. The first set of peaks were approximately 10 K less than the Tc(0) values, whereas the second set of peaks occured in the temperature range 40-60 K. Both sets of peaks shifted towards lower temperatures with increasing Ca2CuO3 concentration. The role of Ca2CuO3 in the growth of 2223 phase and the mechanism of energy loss are discussed.

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