UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-22 2:28
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Conference: Bucharest University Faculty of Physics 2006 Meeting


Section: Solid State Physics and Materials Science


Title:
On the basic mechanisms of dislocations movement involved in the newly discovered low-temperature plasticity of SrTiO3


Authors:
C.Sarbu(1),W.Sigle(2),D.Brunner(2) and M.Ruehle (2)


Affiliation:
(1) INCDFM, Bucharest-Magurele, Romania

(2) Max-Planck Institut fuer Metallforschung, Stuttgart


E-mail
crnl_srbu@yahoo.com


Keywords:
perovskite structure, oxide ceramics, cryogenic plasticity


Abstract:
A surprising plasticity behaviour of SrTiO3 (STO) single crystals on a large range of temperatures was recently discovered at the Max-Planck Institute for Metals Research in Stuttgart, Germany [1-3]. One of the striking features is the plasticity down to cryogenic temperatures. At 78 K tensile stresses of about 300 MPa are measured up to high tensile strains of about 7%. At room temperature tensile stresses of about 120 MPa are measured. The presentation will be focussed on the recent results of TEM investigations allowing a deeper insight in the mechanisms of the dislocations movement controlling the plasticity of STO single crystals. [1] P.Gumbsch, S.Taeri-Baghbadrani, D.Brunner, W.Sigle, M.Ruehle: Phys.Rev.Lett.87(2001)085505-1 [2] D.Brunner, S.Taeri-Baghbadrani, W.Sigle, M.Ruehle: J.Am.Ceram.Soc. 84(2001)1161 [3] S.Taeri-Baghbadrani, D.Brunner, W.Sigle, M.Ruehle: Z.Metallkunde 95(2004)6