J. Phys. IV France 04 (1994) C9-105-C9-108
EXAFS analysis of intermediate phases in the synthesis of the Y Ba2 Cu 3O7-x high-Tc superconductor from xerogelI. Arcon1, M. Bele2, M. Hribar1, A. Kodre1, S. Pejovnik2, M. Stuhec1 and W. Drube3
1 Jozef Stefan Institute, Jamova 39, 61111 Ljubljana, and Department of Physics, University of Ljubljana, Slovenia
2 National Institute of Chemistry, Hajdrihova 19, 61115 Ljubljana, Slovenia
3 HASYLAB at DESY, Hamburg, Germany
In the synthesis of superconducting cuprate ceramics starting from gels, the advantage of stoichiometric homogeneity of the constituent atoms on the molecular level is exploited. However, x-ray diffraction analysis of samples taken in consecutive temperature points in the process of calcination shows formation of a number of well-crystalized intermediary products. EXAFS spectrometry gives additional insight into the process, providing the information on the neighborhood of constituent atoms in the crystalline as well as amorphous phase.
© EDP Sciences 1994