Pseudoproper ferroelastic softening behaviour and dynamic microstructure of monoclinic PrAlO<sub>3</sub> perovskite

Carpenter, M. A. and Wiltshire, E. C and Howard, C. J. and Thomson, R. I and Turczynski, S. and Pawlak, D. A and Lukasiewicz, T. (2010) Pseudoproper ferroelastic softening behaviour and dynamic microstructure of monoclinic PrAlO<sub>3</sub> perovskite. Phase Transitions: A Multinational Journal, 83 (9). pp. 703-713. DOI 10.1080/01411594.2010.491953

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Official URL: http://www.informaworld.com/10.1080/01411594.2010....

Abstract

Elastic and anelastic properties of single crystal PrAlO<sub>3</sub> have been investigated by resonant ultrasound spectroscopy at 0.2–1.2 MHz. Non-linear (pseudoproper) softening with falling temperature in the <a name="ILM0001"> </a> stability field below ∼690 K is related to the elastic stability limit <a name="ILM0005"> </a>. Before this instability point is reached, the first order <a name="ILM0002"> </a> <i>Imma</i> transition intervenes and is marked by a steep minimum in shear elastic constants. Further pseudoproper ferroelastic softening then occurs, consistent with <a name="ILM0003"> </a> at ∼151 K for the second-order <i>Imma</i> ↔ <i>C</i>2/<i>m</i> transition. Superattenuation of acoustic resonances within the stability field of the <i>C</i>2/<i>m</i> structure implies that the monoclinic twin walls are highly mobile, apart from in a narrow temperature interval near 100 K where the structure becomes metrically tetragonal. PrAlO<sub>3</sub> appears to represent a general class of Jahn–Teller phase transitions in perovskites for which the predominant order parameter transforms according to <a name="ILM0004"> </a> symmetry and which displays an unusual anelastic dissipation.

Item Type: Article
Uncontrolled Keywords: 2010AREP; IA61;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Phase Transitions: A Multinational Journal
Volume: 83
Page Range: pp. 703-713
Identification Number: 10.1080/01411594.2010.491953
Depositing User: Sarah Humbert
Date Deposited: 09 Sep 2010 11:22
Last Modified: 23 Jul 2013 10:00
URI: http://eprints.esc.cam.ac.uk/id/eprint/1933

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