A.c. and d.c. susceptibility studies on silver-doped BPSCCO (2223) superconductors

Muralidhar Miryala, K. Nanda Kishore, S. Satyavathi, O. Pena, V. Hari Babu

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Abstract

A.c. and d.c. susceptibility studies were undertaken on Ag-doped Bi1.7Pb0.3Ca2Sr2Cu3 Oy samples to investigate the quality of the materials and the critical current density. X-ray diffraction (XRD) and resistance measurements were also performed to determine the phase of the samples and the influence of Ag addition on Tc(0). XRD results show that the (2223) high-Tc phase is retained and Tc(0) varies between 103 and 107 K. These results suggest that the superconducting properties are not destroyed by Ag addition. The a.c. susceptibility results show two troughs in the χ′ vs. T curves and two peaks in the χ″ vs. T plots. The first peak is smaller, is close to the transition temperature and corresponds to the midpoint of the first trough in the χ-T curve. The second peak appears below 98 K and corresponds to the midpoint of the second trough. The positions of both sets of peaks remain almost the same. The low-temperature peaks are sharper in samples containing silver compared with the pure sample, and the sharpness increases with an increase in silver concentration. Jc was calculated from d.c. susceptibility data using Bean's critical state and plate-like models. Jc was calculated from d.c. susceptibility data using Bean's critical state and plate-like models. Jc increases with silver doping. The increase in sharpness of the low-temperature loss peak with an increase in Ag concentration and critical current density suggests that Ag probably precipitates along the grain boundaries and improves the interconnectivity between the grains.

Original languageEnglish
Pages (from-to)151-155
Number of pages5
JournalMaterials Science and Engineering B
Volume26
Issue number2-3
DOIs
Publication statusPublished - 1994
Externally publishedYes

Fingerprint

Silver
Superconducting materials
silver
magnetic permeability
troughs
X ray diffraction
sharpness
Superconducting transition temperature
Precipitates
critical current
Grain boundaries
Doping (additives)
current density
Temperature
curves
diffraction
precipitates
x rays
grain boundaries
plots

ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

A.c. and d.c. susceptibility studies on silver-doped BPSCCO (2223) superconductors. / Miryala, Muralidhar; Nanda Kishore, K.; Satyavathi, S.; Pena, O.; Hari Babu, V.

In: Materials Science and Engineering B, Vol. 26, No. 2-3, 1994, p. 151-155.

Research output: Contribution to journalArticle

Miryala, Muralidhar ; Nanda Kishore, K. ; Satyavathi, S. ; Pena, O. ; Hari Babu, V. / A.c. and d.c. susceptibility studies on silver-doped BPSCCO (2223) superconductors. In: Materials Science and Engineering B. 1994 ; Vol. 26, No. 2-3. pp. 151-155.
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