Markova N. Weakly bound oxygen in barium-yttrium cuprate doped with REE

Object - oxide high-temperature superconductor materials based on barium-yttrium cuprate YBa2Cu3Ox. The aim of the work is determination of specific features of oxygen nonstoichiometry in solid solutions of superconducting cuprates doped with RE elements or nonstoichiometric in cations Y/Ba. Research methods: termogravimetry, X-ray diffraction analysis, scanning electronic microscopy, IR-spectroscopy, X-ray photoelectronic spectroscopy, chemical analysis, induction method of measurement of magnetic properties. In barium-yttrium cuprate doped with RE, occurrence of an additional component of oxygen nonstoichiometry, which differs from usually observed in undoped samples in binding energy and in the rate of diffusion in crystal lattices, is revealed; the limits of its variation, as well as dependence on conditions of synthesis and method of structural realization, and also influence on structural and electrophysical properties of superconducting cuprates were determined. Field of application - electronic materials.