OXYGEN NON-SI~ICHIOMETRY OF Ndl.ssCeo.15Cul_~Oy AS A FUNCTION OF 8 AND ITS RELATION WITH THE SUPERCONDUCTING PROPERTIES

F. PRADO; A. CANEIRO; A. SERQUIS

JOURNAL OF THERMAL ANALYSIS

John Willey & Son2

Lugar: Budapest; Año: 1997 vol. 48 p. 1027 - 1038

0368-4466

Thermogravimetric measurements of the equilibrium oxygen partial pressure (Po) as a functionof the oxygen content y were performed on Ndl.ssCe0.15Cul,~Oy samples with cdntrolled Cucontents (1 +6= 1.00, 1.01 and 1.02) at 1173 and 1237 K. The data obtained showed a dependenceof the oxygen non-stoichiometry on the nominal Cu content. These measurements are discussedin terms of the presence of Cu defects in the T' structure. The superconducting responseof this material in samples with controlled oxygen and Cu contents was also studied. The superconductingresponse was found to be very sensitive to the presence of small amounts of cationicand anionic defects.