Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/931356
- Ferroelastic phase transitions and anelastic dissipation in the LaAlO₃-PrAlO₃ solid solution series
Thomson, R. I.;
Rawson, J. M.;
Howard, C. J.;
Pawlak, D. A.;
Carpenter, M. A.
- The University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering
- 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.
- Physical Review B: Condensed Matter and Materials Physics Vol. 82, Issue 21
- Publisher Link
- American Physical Society
- Resource Type
- journal article