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Einfluss einer Wärmebehandlung auf die Supraleitfähigkeit Zink‐dotierter YBa 2 Cu 3‐x Zn x O 7‐y
Author(s) -
Xue Z.,
Fu H.,
Dong A.,
Che G.,
Wang Y.
Publication year - 2011
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201100697
Subject(s) - ionic radius , superconductivity , valence (chemistry) , analytical chemistry (journal) , annealing (glass) , oxygen , transition temperature , doping , crystal structure , chemistry , superconducting transition temperature , lattice constant , materials science , crystallography , ion , condensed matter physics , metallurgy , diffraction , physics , optoelectronics , organic chemistry , chromatography , optics
Abstract YBa 2 Cu 3‐ x Zn x O 7‐y compounds with x = 0, 0.05, 0.15, and 0.30 have been synthesized by standard solid state reaction method. The crystal structure, lattice parameters, and oxygen content are not changed by the substitution of Zn for Cu since both valence state and ionic radius are almost identical for Zn and Cu elements in YBa 2 Cu 3‐ x Zn x O 7‐y . However, the superconducting transition temperature T c decreases with the increase of Zn content, reflecting the T c ‐suppression effect of Zn substitution. Heat treatment experiments indicate that the heat treatment at low temperature is beneficial to improve the superconductivity of the sample. But T c decreases with the increase of annealing temperature when the treatment temperature is above 300°C, and finally the superconductivity disappears at approximately 920°C, 700°C and 550°C for the samples with x = 0.0, 0.05 and 0.15, respectively. Our experiments indicate that the superconductivity of the sample with higher Zn content is more sensitive to the oxygen content, and a small decrease in the oxygen content can lead to a considerable decrease of T c .