INVESTIGADORES
CANEIRO Alberto
artículos
Título:
THERMOGRAVIMETRIC INVESTIGATION OF THE OXYGEN CONTENT AS A FUNCTION OF OXYGEN PARTIAL PRESSURE IN La,,,Sr,,CuO~ AT 1173 K
Autor/es:
A. CANEIRO; D. SERAFINI; J.P. ABRIATA; J. ANDRADE GAMBOA
Revista:
SOLID STATE COMMUNICATIONS
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 1990 vol. 75 p. 915 - 919
ISSN:
0038-1098
Resumen:
Thermogravimetric measurements have been performed at 1173 K onLa,,,Sr,,CuO~ samples with the tetragonal K,NiF,-type structure.Depending on the sample preparation method, La,,~Sr,,CuO~ can betrapped in metastable states showing a characteristic plateau m Paz vsy at PO1 = 5( f 2) x 10m3 atm. The existence of this plateau is correlativeto y values larger than y = 4. Cycling the sample betweenPO, = 1 to lop6 atm makes the metastable isotherms to evolve slowlytowards the true equilibrium one. A possible reason for the appearanceof the plateau is discussed in terms of La8~.~Sr.CusOz0_E microdomains.
