ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 38, (3) 143 - 149 (1994)


POSSIBLE COMPOSITION CHANGES OF THE YBa₂Cu₃Ox SURFACE LAYER ON THE BOUNDARY WITH NEGATIVE CHARGE
 
Moiseev German 1, Šesták Jaroslav 2, Štěpánek Bedřich 2
 
1 Institute of Metallurgy, Russian Academy of Science, Ural Division, Ekaterinburg, 620219, GSP-812, Amundsen, 101, Russian Federation
2 Institute of Physics, Department of Semiconductors, Academy of Sciences of the Czech Republic, Cukrouarnická 10, 162 00 Praque - 6, Czech Republic

Ideal (x = 7) and close to real (x = 6.85) composition of the YBa₂Cu₃Ox superconductor can be assumed to change on the boundary with negative charge surface. The two used methods of calculation (generalized measurements and absorption) show a considerable reduction of copper ion valence.


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