Suppression of strain coupling in perovskite La0.6Sr0.1TiO3 by cation disorder

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dc.contributor.authorHoward, CJen_AU
dc.contributor.authorZhang, Zen_AU
dc.contributor.authorCarpenter, MAen_AU
dc.contributor.authorKnight, KSen_AU
dc.date.accessioned2010-09-02T04:22:02Zen_AU
dc.date.available2010-09-02T04:22:02Zen_AU
dc.date.issued2007-08en_AU
dc.date.statistics2007-08en_AU
dc.description.abstractAn octahedral tilting transition has been investigated in two samples of La0.6Sr0.1TiO3 by powder neutron diffraction. One (slowly cooled) sample had a degree of cation/vacancy ordering on the A sites and was tetragonal, P4/mmm, at high temperatures. The second (quenched) sample had disordered cations and cubic, Pm3¯m, symmetry at high temperatures. On cooling, both underwent the same R-point tilting transition at ~560–570 K, to give symmetry changes P4/mmm↔Cmmm and Pm3¯m↔I4/mcm, respectively. From the evolution of the tilt angles, the transition appears to be close to tricritical in both cases. As expected from a Landau expansion in the two order parameters, the transition temperature was found to be only weakly dependent on the degree of cation order. In contrast with the expectation of standard patterns of strain to order parameter coupling, however, the tilted (tetragonal) form of the disordered sample remained metrically cubic, implying that coupling of the tetragonal shear strain with the octahedral tilting was suppressed. It is proposed that cation disordering causes the development of local strain heterogeneities in crystals of La0.6Sr0.1TiO3 which prevent a coherent, long-range shear strain from developing. Manipulation of the degree of cation order in perovskites with carefully selected compositions might therefore provide a means by which the magnitudes of ferroelastic strains could be engineered according to the requirement of particular applications. © 2007, American Physical Societyen_AU
dc.identifier.articlenumber54108en_AU
dc.identifier.citationHoward, C. J., Zhang, Z., Carpenter, M. A., & Knight, K. S. (2007). Suppression of strain coupling in perovskite la0.6sr0.1tio3 by cation disorder. Physical Review B, 76(5), 054108. doi:10.1103/PhysRevB.76.054108en_AU
dc.identifier.govdoc2585en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.76.054108en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2425en_AU
dc.identifier.volume76en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectPerovskiteen_AU
dc.subjectCationsen_AU
dc.subjectCouplingen_AU
dc.subjectStrainsen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectTetragonal latticesen_AU
dc.titleSuppression of strain coupling in perovskite La0.6Sr0.1TiO3 by cation disorderen_AU
dc.typeJournal Articleen_AU
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