2024-03-29T15:56:15Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/157502022-08-29T13:09:30Zcom_10261_46com_10261_3col_10261_299
http://hdl.handle.net/10261/15750
10.1016/0921-4534(96)00137-2
15375
Cationic Substitutions and Doping in the Series of Layered Perovskites Ln2Ba2Cu2Ti2O11 (Ln=La,Nd,Eu,Tb)
Elsevier
1996
artículo
Palacín, M. Rosa
rp14513
Casañ Pastor, Nieves
Krämer, G.
Jansen, M.
Gómez-Romero, P.
rp01601
Copper-titanium oxides
Layered perovskites
Doping
High-pressure
1996-04-20
Several cationic substitutions have been performed on the series of layered perovskites Ln2Ba2Cu2Ti2O11 (Ln = La, Nd, Eu, Tb). The substitution attempts of the Ln ions that we performed were not successful. On the other hand K could be substituted for Ba and Sc, Al, Co, Zn and Cu for Ti. Nevertheless we found in all case a spontaneous loss of oxygen taking place upon substitution. This oxygen stoichiometry readjustment is such that leaves the oxides effectively undoped. Several attempts at oxidations nder high pressures of oxygen have been made, resulting oxygenation and doping of La2Ba2Cu2.15Ti1.85O11. Nevertheless this oxide does not present signs of superconductivity down to 4 K due most likely to the long Cu---O bond distance in its structure. Some n-type substitutions were also tried.
Dirección General de Investigación Científica y Técnica, DGICT (España)
Generalitat de Catalunya
Ministerio de Educación y Ciencia (España)
Consejo Superior de Investigaciones Científicas (España)
Karlsruhe Institute of Technology
closedAccess
Physica C: Superconductivity 261(1-2)
1996
71
80