Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-23T12:29:06.806Z Has data issue: false hasContentIssue false
  • English
  • Français

Kinetic control of order in the layered perovskite La2Ba2Cu2Ti2O11

Published online by Cambridge University Press:  31 January 2011

Maria Rosa Palacín ,
Pedro Gómez-Romero  and
Frank Krumeich
Maria Rosa Palacín
Affiliation:
Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain
Pedro Gómez-Romero*
Affiliation:
Institut de Ciència de Materials de Barcelona (CSIC), Campus UAB, E-08193 Bellaterra, Barcelona, Spain
Frank Krumeich
Affiliation:
Institut für Angewandte Chemie, Berlin-Adlershof, Rudower Chaussee 5, D-12484 Berlin, Germany
*
a) Author to whom correspondence should be addressed.
Get access

Abstract

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.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 5 , May 1998 , pp. 1147 - 1151
Copyright
Copyright © Materials Research Society 1998

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Galasso, F. S., Perovskites and High Tc Superconductors (Gordon and Breach Science Pub., New York, 1990).Google Scholar
2.Rao, C. N. R. and Gopalakrishnan, J., New Directions in Solid State Chemistry (Cambridge University Press, New York, 1989), Chap. 5.Google Scholar
3.Reller, A. and Williams, T., Chemistry in Britain (Dec. 1989), p. 1227.Google Scholar
4.Anderson, M. T., Vaughey, J. T., and Poeppelmeier, K. R., Chem. Mater. 5, 151 (1993).CrossRefGoogle Scholar
5., M. R. Palacín, Ph.D. Thesis, Universitat Autònoma de Barcelona, Nov. 1995.Google Scholar
6.Palacín, M. R., Bassas, J., Rodríguez-Carvajal, J., and Gómez-Romero, P., J. Mater. Chem. 3 (11), 1171 (1993).CrossRefGoogle Scholar
7.Palacín, M. R., Fuertes, A., Casañ-Pastor, N., and Gómez-Romero, P., Adv. Mater. 6 (1), 54 (1994).CrossRefGoogle Scholar
8.Gómez-Romero, P., Palacín, M. R., and Rodríguez-Carvajal, J., Chem. Mater. 6, 2118 (1994).CrossRefGoogle Scholar
9.Palacín, M. R., Krumeich, F., Caldés, M. T., and Gómez-Romero, P., J. Solid State Chem. 117, 213 (1995).CrossRefGoogle Scholar
10.Palacín, M. R., Fuertes, A., Casañ-Pastor, N., and Gómez-Romero, P., J. Solid State Chem. 119, 224 (1995).CrossRefGoogle Scholar
11.Anderson, M. T., Poeppelmeier, K. R., Zhang, J. P., Fan, H. J., and Marks, L. D., Chem. Mater. 4, 1305 (1992).CrossRefGoogle Scholar
12.Salvador, P. A., Shen, L., Mason, T. O., Greenwood, K. B., and Poeppelmeier, K. R., J. Solid State Chem. 119, 80 (1995).CrossRefGoogle Scholar
13.Gormezano, A. and Weller, M. T., J. Mater. Chem. 3 (7), 771 (1993).CrossRefGoogle Scholar
14.Gormezano, A. and Weller, M. T., J. Mater. Chem. 3 (9), 979 (1993).CrossRefGoogle Scholar
15.Gormezano, A. and Weller, M. T., Chem. Mater. 7, 1625 (1995).CrossRefGoogle Scholar
16.Greenwood, K. B., Sarjeant, G. M., Poeppelmeier, K. R., Salvador, P. A., Mason, T. O., Dabrowski, B., Rogacki, K., and Z. Chen, Chem. Mater. 7, 1355 (1995).CrossRefGoogle Scholar
17.Fukuoka, A., Adachi, S., Sugano, T., Wu, X. J., and Yamauchi, H., Physica C 231, 372 (1994).CrossRefGoogle Scholar
18.Rukang, L., J. Mater. Chem. 4 (5), 773 (1994).Google Scholar
19.Rukang, L., J. Solid State Chem. 114, 57 (1995).CrossRefGoogle Scholar