Exoemission Testing of Violations of the Stoichiometry in High-Temperature Superconducting Ceramics on the Basis of YBa2Cu3O7–δ

Syurdo, A. I.; Kortov, V. S.; Mil'man, I. I.; Slesarev, A. I.
January 2004
Russian Journal of Nondestructive Testing;Jan2004, Vol. 40 Issue 1, p29
Academic Journal
Samples of high-temperature superconducting (HTSC) ceramics YBa2Cu3O7–δ thermally treated in oxidizing and reducing media are investigated by means of the exoelectron emission method. It is found that the thermostimulated exoemission (TSE) increases considerably in the maximum at 470 K after reducing thermal treatment of HTSC ceramics at temperatures of 800–860 K. Correlation dependences between the exoemission activity, the deviation from the stoichiometry in the oxygen sublattice, and the temperature of transition of YBa2Cu3O7–δ ceramics to the superconducting state are found. These dependences indicate that the exoemission testing can be used in the design of technologies of the synthesis and treatment of HTSC materials on the basis of complex oxides.


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