Plasticity and an inverse brittle-to-ductile transition in strontium titanate

The use of ceramic materials is often restricted by a transition from ductile behavior to brittle fracture with decreasing temperature. For example, strontium titanate ( SrTiO3) is known to be extremely fragile and brittle below 1300 K. It is therefore surprising to find that SrTiO3 single crystals...

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Veröffentlicht in:	Physical review letters 2001-08, Vol.87 (8), p.085505-085505, Article 085505
Hauptverfasser:	Gumbsch, P, Taeri-Baghbadrani, S, Brunner, D, Sigle, W, Rühle, M
Format:	Artikel
Sprache:	eng
Schlagworte:	CERAMICS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COMPRESSION DEFORMATION DISLOCATIONS FRACTURES MONOCRYSTALS PLASTICITY PLASTICS STRAINS STRESSES STRONTIUM TITANATES
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container_title	Physical review letters
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creator	Gumbsch, P Taeri-Baghbadrani, S Brunner, D Sigle, W Rühle, M
description	The use of ceramic materials is often restricted by a transition from ductile behavior to brittle fracture with decreasing temperature. For example, strontium titanate ( SrTiO3) is known to be extremely fragile and brittle below 1300 K. It is therefore surprising to find that SrTiO3 single crystals can be deformed in compression below 1050 K again. Extensive plastic deformation up to 7% strain at low yield stresses of the order of only 120 MPa is possible at room temperature. Low temperature plasticity is carried by the same [110] [110] dislocations as the high temperature deformation along the [001] axis. From this we conclude that these dislocations must exist in two different core configurations.
doi_str_mv	10.1103/physrevlett.87.085505
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subjects	CERAMICS CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS COMPRESSION DEFORMATION DISLOCATIONS FRACTURES MONOCRYSTALS PLASTICITY PLASTICS STRAINS STRESSES STRONTIUM TITANATES
title	Plasticity and an inverse brittle-to-ductile transition in strontium titanate
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