Thermodynamic desorption of oxygen in high Tc superconducting oxides

J.P. Burger , L. Lesueur (1) , M. Nicolas , J.N. Daou , L. Dumoulin (1) , P. Vajda

1 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse

We measure as a function of temperature and composition the equilibrium pressure of desorbed oxygen from superconducting oxides MBa2 Cu 3 O6+x (M=Eu, Y). Using the Lacher model we determine the enthalphy of formation of the excess oxygen x (-0.7 eV/atom) as well as the repulsive O-O interaction energy (0.11eV). We also observe that there is a spontaneous reabsorption of the oxygen above about 600° C with formation of more stable oxides.

Mots clés: barium compounds; copper compounds; desorption; europium compounds; heat of formation; oxygen; type II superconductors; yttrium compounds

Domaines: Articles anciens

J.P. Burger, L. Lesueur, M. Nicolas, J.N. Daou, L. Dumoulin, et al.. Thermodynamic desorption of oxygen in high Tc superconducting oxides. Journal de Physique, 1987, 48 (9), pp.1419-1422. ⟨10.1051/jphys:019870048090141900⟩. ⟨jpa-00210571⟩