Skip to main content Accessibility help
×
Home

Homogeneity area of Bi2Sr2CaCu2O8 - based solid solutions with substitution of alkaline earth elements by Nd and La

  • A.G. Veresov (a1), A.V. Knotko (a2), D.V. Korolyov (a1), A.V. Garshev (a1) and V.I. Putlayev (a1)...

Abstract

Creation of precipitates in bulk matrix to act as pinning centres is a prospective way to improve critical current density in high temperature superconductors. It is possible to generate such precipitates via partial decomposition of the supersaturated solid solution derived from a superconducting phase. To control this process one should go by a knowledge of stability field for these solutions. The objective of present work was determination of the homogeneity area of Bi2Sr2Ca1−xRxCu2O8+d and Bi2Sr2−xCaRxCu2O8+d (R = Nd, La). Semi-quantitative XRD analysis was used to evaluate phase composition of specimens quenched from various temperatures. It was found that solubility limits of Nd and La in Bi-2212 for cases of alkaline earth element substitution by rare earth elements with smaller ionic radii (substitution Ca by Nd; Sr by Nd and La) were the same (values of x are about 0.8). These limits are determined by fraction of Cu+ ions in lattice site attributed to Cu2+. In case of substitution of Ca by La stability area of 2212 was found to be much narrower (values of x about 0.3) compared to other substitutions. One ca n deduce this fact from the difference of Ca2+ and La3+ ionic radii.

Copyright

References

Hide All
1. Groen, W.A., Steens, R, Zandbergen, H.W.. Journal of the Less-Common Metals, 155, 133, (1989).
2. Shannon, R.D., Prewitt, C.T.. Acta Crystallogr., B25, 935, (1969).
3. Babushkina, N.A., Dobrotvorskaya, M.V., Kasatkina, N.A., Poltoratsky, Yu.B., Sobolev, V.L., Kucheiko, S.V.. Physica C, 197, 299, (1992).

Homogeneity area of Bi2Sr2CaCu2O8 - based solid solutions with substitution of alkaline earth elements by Nd and La

  • A.G. Veresov (a1), A.V. Knotko (a2), D.V. Korolyov (a1), A.V. Garshev (a1) and V.I. Putlayev (a1)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed