caa a22 4500 388022965 CHVBK 20180307124929.0 cr unu---uuuuu 161130e199805 xx s 000 0 eng 10.1557/JMR.1998.0163 doi S0884291400044009 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0163 Kinetic control of order in the layered perovskite La2Ba2Cu2Ti2O11 [Elektronische Daten] Definitive evidence on the variable degrees of order/disorder in the layered perovskite La2Ba2Cu2Ti2O11 is presented. This oxide was prepared by the ceramic method with varying reaction times and cooling rates; the average and local structures of the resulting solids were studied by x-ray diffraction, electron diffraction, and transmission electron microscopy (low and high resolution). The data clearly show the presence of an ap × ap × 4ap layered perovskite superstructure with a high concentration of defects in samples prepared over 48 h but with increasing degree of order for samples with longer reaction times. For samples reacted over 17 days, the order is complete and identical to that found for other related derivatives such as Ln2Ba2Cu2Ti2O11 (Ln = Nd, Eu, Tb). This behavior clearly indicates the existence of a kinetic control of order in this phase. Copyright © Materials Research Society 1998 Palacín Maria Rosa Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain Gómez-Romero Pedro Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain Krumeich Frank Institut für Angewandte Chemie, Berlin-Adlershof, Rudower Chaussee 5, D-12484 Berlin, Germany Journal of Materials Research Cambridge University Press 13/5(1998-05), 1147-1151 0884-2914 13:5<1147 1998 13 JMR https://doi.org/10.1557/JMR.1998.0163 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0163 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Palacín Maria Rosa Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain NATIONALLICENCE 700 1- Gómez-Romero Pedro Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain NATIONALLICENCE 700 1- Krumeich Frank Institut für Angewandte Chemie, Berlin-Adlershof, Rudower Chaussee 5, D-12484 Berlin, Germany NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/5(1998-05), 1147-1151 0884-2914 13:5<1147 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge