Author/Authors :
Odier، نويسنده , , Philippe and Gotor، نويسنده , , Francisco J and Pellerin، نويسنده , , Nadia and Lobo، نويسنده , , Ricardo P.S.M and Dembinski، نويسنده , , Kristof and Ayache، نويسنده , , Jeanne and Noel، نويسنده , , Henry and Potel، نويسنده , , Michel and Chaminade، نويسنده , , Jean Pierre and Collin، نويسنده , , Gaston، نويسنده ,
Abstract :
Copper deficiency is studied in YBa2Cu3O7−x phase. We compare polycrystals formed by sintering with textured and single crystals. The experimental method uses electron probe micro-analysis and X-ray structural determinations on single crystals. We show that YBa2Cu3O7−x phase accommodates Cu deficiency up to several percent. Copper vacancies are located at the Cu(1) site (in the chains). Copper deficiency is evidenced when a liquid phase is involved in the chemical process. The implications of copper vacancies on the physical properties has probably to be reconsidered in future.
