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Reduction of YBCO melting temperature by simultaneous Ca substitution and Ag addition

K. BUCHKOV1,* , E. NAZAROVA1, K. GUROVA2, A. ZAHARIEV1, H. SECHENSKI3, K. NENKOV4,5

Affiliation

  1. Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria
  2. Prof. Assen Zlatarov University, 8010 Burgas, Bulgaria
  3. Acad. A. Balevski Institute of Metal Science, Equipment and Technologies with Hydro-aerodynamics center, Bulgarian Academy of Sciences, 1574 Sofia, Bulgaria
  4. IFW, Leibniz Institute for Solid State and Materials Research, P.O. BOX 270016, D-01171 Dresden, Germany
  5. International Laboratory of High Magnetic Fields and Low Temperatures, 53-421 Wroclaw, Poland

Abstract

Series of polycrystalline samples with composition Y1-xCaxBa2Cu3O7-δ (x=0.025, 0.05 and 0.20) were investigated by Differential Thermal Analysis (DTA). A systematic decrease of the melting temperature - Tm with increasing of the Ca content was established. For sample with x=0.20, small endothermic minimum is observed, which could be fingerprint of (e1) binary eutectic reaction, due to presence of BaCuO2. DTA solidification curves shows indication for easier nucleation of Y(Ca)123 phase. The simultaneous effect of Ca substitution and Ag-addition, also lead to additional reducing of Tm. The presence of (e1) reaction is detected for all Ag-added samples. The observed decrease effects of Ca on the Tm are used for preparation of mono-filamentary Ag-sheathed tape with Y0.80Ca0.20Ba2Cu3O7-δ core. The partial melting and texture is observed in superconductor, but the current transport of the tape is still insufficient..

Keywords

Ca-substitution, Ag-addition, DTA analysis.

Citation

K. BUCHKOV, E. NAZAROVA, K. GUROVA, A. ZAHARIEV, H. SECHENSKI, K. NENKOV, Reduction of YBCO melting temperature by simultaneous Ca substitution and Ag addition, Optoelectronics and Advanced Materials - Rapid Communications, 6, 11-12, November-December 2012, pp.1061-1063 (2012).

Submitted at: July 25, 2012

Accepted at: Oct. 30, 2012