| Issue |
Eur. Phys. J. AP
Volume 7, Number 1, July 1999
|
|
|---|---|---|
| Page(s) | 33 - 40 | |
| DOI | https://doi.org/10.1051/epjap:1999196 | |
| Published online | 15 July 1999 | |
https://doi.org/10.1051/epjap:1999196
A homologous series Pb2n+1Nb2n−1O7n−1 studied by electron microscopy
1
Laboratoire Matériaux Multiphasés et Interfaces, Université de Toulon-Var, B.P. 132,
83957 La Garde Cedex, France
2
EMAT, University of Antwerp (RUCA), Groenenborgerlaan
171, 2020 Antwerpen, Belgium
Corresponding author: leroux@univ-tln.fr
Received:
30
October
1998
Revised:
21
January
1999
Accepted:
6
April
1999
Published online: 15 July 1999
The PbO–Nb2O5 phase diagram has been investigated, using electron diffraction and high resolution electron microscopy (HREM), for [Pb]/[Nb] ratios between 1 and 1.25. Apart from the basic pyrochlore structure, different long period superstructures, forming a homologous series Pb2n+1Nb2n−1O7n−1 based on the pyrochlore structure have been found. Members with n = 5, 7, 9, 11 have been observed and their structure determined based on electron diffraction and HREM. Image simulations allow studying the influence of cation and oxygen vacancies in the basic structure. Ordering of oxygen vacancies could be detected while no cation vacancies are observed. Deviations from the perfect structure and ordered stacking defects are discussed.
PACS: 61.72.Nn – Stacking faults and other planar or extended defects / 77.84.Dy – Niobates, titanates, tantalates, PZT ceramics, etc. / 61.16.Bg – Transmission, reflection and scanning electron microscopy (including EBIC)
© EDP Sciences, 1999
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