- Title
- Ferroelastic phase transitions and anelastic dissipation in the LaAlO₃-PrAlO₃ solid solution series
- Creator
- Thomson, R. I.; Rawson, J. M.; Howard, C. J.; Turczynski, S.; Pawlak, D. A.; Lukasiewicz, T.; Carpenter, M. A.
- Relation
- Physical Review B: Condensed Matter and Materials Physics Vol. 82, Issue 21
- Publisher Link
- http://dx.doi.org/10.1103/PhysRevB.82.214111
- Publisher
- American Physical Society
- Resource Type
- journal article
- Date
- 2010
- 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.
- Subject
- ultrasound spectroscopy; ferroelastic softening; superattenuation; perovskites
- Identifier
- http://hdl.handle.net/1959.13/931356
- Identifier
- uon:11043
- Identifier
- ISSN:1550-235X
- Language
- eng
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