| Issue |
Europhys. Lett.
Volume 61, Number 5, March 2003
|
|
|---|---|---|
| Page(s) | 653 - 659 | |
| Section | Condensed matter: structure, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2003-00121-4 | |
| Published online | 01 February 2003 | |
Observation of a sample-dependent 37
anomaly
on the lattice parameters of strontium titanate
1
Laboratoire des Verres, UMR 5587 CNRS, Université Montpellier II F-34095 Montpellier Cedex 5, France
2
Institut Laue-Langevin - BP 156, F-38042 Grenoble Cedex 9, France
3
Laboratoire de Physique des Solides, UMR 8502 CNRS, Université Paris-Sud F-91405 Orsay Cedex, France
4
European Synchrotron Radiation Facility BP 220, F-38043 Grenoble Cedex, France
Received:
5
August
2002
Accepted:
16
December
2002
The lattice parameters of tetragonal strontium titanate are
determined to about 1 part in 106 with penetrating X-rays.
While no peculiarity is detected in a bulk sample, a distinct
anomaly at 37 is observed in an optically polished thin
platelet derived from the same single crystal. This suggests that
the anomaly is related to a high density of dislocations. A
possible mechanism is that dislocations stabilize transverse
antiphase boundaries which undergo a ferroelectric transition near
37. If so, this transition stresses the boundaries which
then strain the bulk leading to the observed anomaly.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 77.84.Dy – Niobates, titanates, tantalates, PZT ceramics, etc / 61.10.-i – X-ray diffraction and scattering
© EDP Sciences, 2003
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