Ferroelastic phase transitions and anelastic dissipation in the LaAlO_{3}-PrAlO_{3} solid solution series

Thomson, R. I. and Rawson, J. M. and Howard, C. J. and Turczynski, S. and Pawlak, D. A. and Lukasiewicz, T. and Carpenter, M. A. (2010) Ferroelastic phase transitions and anelastic dissipation in the LaAlO_{3}-PrAlO_{3} solid solution series. Physical Review B, 82 (21). p. 214111. DOI 10.1103/PhysRevB.82.214111

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Abstract

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 low-temperature monoclinic phase, implying a high mobility also for the monoclinic twin walls.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA62;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Physical Review B
Volume: 82
Page Range: p. 214111
Identification Number: 10.1103/PhysRevB.82.214111
Depositing User: Sarah Humbert
Date Deposited: 25 Mar 2011 16:50
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2036

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