Volume 61, Number 5, March 2003
|Page(s)||653 - 659|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 February 2003|
Observation of a sample-dependent 37 anomaly on the lattice parameters of strontium titanate
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
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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