Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/931356

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Title
Ferroelastic phase transitions and anelastic dissipation in the LaAlO₃-PrAlO₃ solid solution series
Author/Creator
Thomson, R. I.;  Rawson, J. M.;  Howard, C. J.;  Turczynski, S.;  Pawlak, D. A.;  Lukasiewicz, T.;  Carpenter, M. A.
Institution
The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
Description
Resonant ultrasound spectroscopy has been used on single-crystal samples to observe pseudoproper ferroelastic softening across the (La,Pr)AlO₃ solid solution. It is suggested that softening is due to the presence of an intrinsic zone-center instability in addition to the small Jahn-Teller stabilization expected for Pr³⁺. Softening increases as smaller Pr³⁺ ions are substituted for larger La³⁺ which is attributed to a simple size effect as well as the possibility of bilinear coupling of the intrinsic instability with the weak Jahn-Teller effect. Superattenuation is observed above 600 K for all samples, which is consistent with twin wall related dissipation behavior seen in other perovskites with octahedral tilting. Superattenuation is also observed in the lowtemperature monoclinic phase, implying a high mobility also for the monoclinic twin walls.
Relation
Physical Review B: Condensed Matter and Materials Physics Vol. 82, Issue 21
Publisher Link
http://dx.doi.org/10.1103/PhysRevB.82.214111
Date
2010
Publisher
American Physical Society
Keyword(s)
ultrasound spectroscopy;  ferroelastic softening;  superattenuation;  perovskites
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/931356
Identifier
ISSN:1550-235X
Reviewed
Reviewed
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Subject
"Physical Review B: Condensed Matter and Materials Physics"
 
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