The effect of Ag on the superconductivity of BiPbSrCaCuO

Ren, Yi; Zuotao, Zeng; Meng, Jian; He, Ping

doi:10.1016/0038-1098(90)90212-t

Cited by 14 publications

(3 citation statements)

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“…This non-poisonous feature of Ag is of significant technical importance in the fabrication of Agsuperconductor composites, such as wires and tapes, in order to overcome the physical and mechanical shortcomings of brittle ceramic superconductors. Many workers [1][2][3][4][5][6][7][8][9][10][11][12][13] have reported on the effects of silver (Ag) on the microstructure and physical properties of the Bi-(Pb)-Sr-Ca-Cu-O system. Ag addition has been found to exert a marked influence on the thermodynamical and kinetic process during sintering and synthesis [6].…”

Section: Introductionmentioning

confidence: 99%

“…However, the rate of formation strongly depends on the form of Ag additive, It is well known that the critical current density j c is the most significant parameter for superconducting applications. In the literature, some workers have reported that Ag doping enhances the critical current density in the Bi-(Pb)-Sr-Ca-Cu-O system [4] and some others have reported conflicting results [5,8,12]. Consequently, it is desirable to provide additional observations which contribute in resolving this controversy or shed light on the origin of the conflicting results.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ag₂O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

Karaca

Çelebi

Varılcı

et al. 2002

Supercond. Sci. Technol.

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The effect of Ag2O addition on the Bi-(Pb)-Sr-Ca-Cu-O system has been investigated in terms of ac susceptibility, phase evolution, critical current density and critical temperature. It was found that as the amount of Ag2O addition increases, the intergranular critical current density decreases in our samples (Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10) fabricated by ammonium nitrate technique. The analysis for comparison is based on the suppression degree of the diamagnetic behaviour with respect to fields, rapid or slow shift of the summit in χ'(T) to lower temperature with increasing field amplitude and the sharpness of the transition of χ'(T) for intergranular component for the same field amplitude. We also qualitatively discuss experimental results in the framework of the critical state model. The room temperature XRD diagram indicates the presence of large amount of high-Tc (2223) phase. The percentage of Bi-2223 phase in the phase mixture was estimated from the intensities of high-Tc (2223) and low-Tc (2212) phase peaks as 78% for the pure BSCCO sample. Among the Ag2O-added BSCCO samples studied, the one in which 5 wt%Ag2O was added shows the highest rate of Bi-2223 formation as 92%. The SEM analysis reveals some morphological changes induced by silver addition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Ag₂O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

Karaca

Çelebi

Varılcı

et al. 2002

Supercond. Sci. Technol.

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“…In Bi-Sr-Ca-Cu.-O (BPCCO) superconductors it is known that Pb must be added to stabilize the 110 K phase [I, 21. But, in order to fabricate the 110 K phase with good reproducibility, addition of Ag to Bi-PbSr-Ca-Cu-O (BPSCCO) superconductors is remarkably effective; for instance, values of T,(end) and T,(on) were investigated for Biz .Pb,Sr,Ca,Cu,O,Agr(z = 0.2-2.0) [3] and Bi,.,Pb,.,Sr,Ca,Cu,O, + Ag (24-90 wt'%) [4].…”

Section: Introductionmentioning

confidence: 99%

The effect of Ag on the superconductivity of Bi_2-xPb_xSr₂Ca₂Cu₃O_ysuperconductors prepared by an optimum thermal procedure

Matsushita

Suzuki

Kishida

et al. 1994

Supercond. Sci. Technol.

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T h e effect of Ag addition (C-100 wt%) to Bi,~,Pb,Sr,Ca,Cu,O, (x = 0.1-1.0) was systematically studied using differential thermal analysis (DTA), electrical resistivity, change in inductance, scanning electron microscopy (sEM)and x-ray diffraction (XRD) studies. T h e sample was prepared by t h e optimum thermal procedure in which t h e sintering was done at t h e endothermic peak temperature judging from the DrA curve. It was found that the 110 K phase was produced with good reproducibility by t h e lowering of the melting temperature due to the addition Of Ag. It was also found that high-T,(end) corresponded well to t h e high-T, fraction m = ZH/(ZH + ZL + 21) (H : 2223. L : 2212, I : Ca,PbO,, Ca,CuO,) defined from the result of XRD measurements.

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Role of Silver on Superconducting Properties of BPSCCO (2223) System

Muralidhar

Kishore

Nagabhushanam

et al. 1993

Cryst. Res. Technol.

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The role of silver for the superconducting properties of the Bi -Pb -Sr -Ca -Cu-0 (2223) system have been investigated systematically. Samples with various concentrations of Ag were prepared by the matrix method. D.C. resistance results showed that TJO) varied between 100-109 K for various compositions of Ag. J , measured at LNT from I-V data shows an increase with silver addition. J , decreased from 90 Amp/cmz at zero field to 16 Amp/cmz at 100 Oe. The r(0) obtained from the susceptibility data agreed with those obtained from resistance measurements. X-ray diffraction results showed that the dominant phase in BPSCCO is the high-temperature (2223) phase and the same is improved in silver added BPSCCO samples. The scanning electron micrographs indicated that silver is precipated along the grain boundaries, separating the superconducting grains. These results have showed that silver addition does not destroy the superconductivity and at the same time enhances the critical current density.

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The effect of Ag on the superconductivity of BiPbSrCaCuO

Cited by 14 publications

References 3 publications

Effect of Ag₂O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

Effect of Ag₂O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

The effect of Ag on the superconductivity of Bi_2-xPb_xSr₂Ca₂Cu₃O_ysuperconductors prepared by an optimum thermal procedure

Role of Silver on Superconducting Properties of BPSCCO (2223) System

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The effect of Ag on the superconductivity of BiPbSrCaCuO

Cited by 14 publications

References 3 publications

Effect of Ag2O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

Effect of Ag2O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

The effect of Ag on the superconductivity of Bi2-xPbxSr2Ca2Cu3Oysuperconductors prepared by an optimum thermal procedure

Role of Silver on Superconducting Properties of BPSCCO (2223) System

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Effect of Ag₂O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

Effect of Ag₂O addition on the intergranular properties of the superconducting Bi (Pb) Sr Ca Cu O system

The effect of Ag on the superconductivity of Bi_2-xPb_xSr₂Ca₂Cu₃O_ysuperconductors prepared by an optimum thermal procedure