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MORPHOLOGY OF Y1Ba2Cu3Oz AND Y0.7 Ca0.3Ba2Cu3Oz BULK SAMPLES DEPENDING ON Ca – SUBSTITUTION

S. Terzieva1,* , A. Stoyanova-Ivanova1, K. Zalamova1, V. Mikli2, Ch. Angelov3, V. Kovachev1

Affiliation

  1. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria
  2. Centre for Materials Research, Tallinn Technical University, Ehitajate 5, Tallinn 79086, Estonia
  3. Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences 72 Tzarigradsko Chaussee Blvd., 1784 Sofia, Bulgaria

Abstract

The effects of calcium substitution on the microstructure, composition and morphology of superconducting bulk samples were analyzed by means of scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDX) techniques. We have shown evidence that a Ca concentration 0.3 is the critical substituted value for YBCO system, in respect of the optimium superconducting properties..

Keywords

YBa2Cu3Oz, Ca-substitution, Morphology, SEM.

Submitted at: Dec. 9, 2004
Accepted at: Jan. 26, 2005

Citation

S. Terzieva, A. Stoyanova-Ivanova, K. Zalamova, V. Mikli, Ch. Angelov, V. Kovachev, MORPHOLOGY OF Y1Ba2Cu3Oz AND Y0.7 Ca0.3Ba2Cu3Oz BULK SAMPLES DEPENDING ON Ca – SUBSTITUTION, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 1, pp. 477-480 (2005)