L. Arzel et al 2003 Europhys. Lett. 61 653 doi:10.1209/epl/i2003-00121-4
L. Arzel1,2, B. Hehlen1, F. Dénoyer3, R. Currat2, K.-D. Liss4 and E. Courtens1
Show affiliationsThe 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 K 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 K. If so, this transition stresses the boundaries which then strain the bulk leading to the observed anomaly.
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
61.10.-i X-ray diffraction and scattering
61.50.Ks Crystallographic aspects of phase transformations; pressure effects
Issue 5 (March 2003)
Received 5 August 2002, accepted for publication 16 December 2002, in final form 16 December 2002
L. Arzel et al 2003 Europhys. Lett. 61 653
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