Elastic softening of leucite and the lack of polar domain boundaries

Aktas, Oktay and Carpenter, Michael A. and Salje, Ekhard K. H. (2015) Elastic softening of leucite and the lack of polar domain boundaries. American Mineralogist, 100 (10). pp. 2159-2162. DOI 10.2138/am-2015-5313CCBY

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Official URL: http://ammin.geoscienceworld.org/content/100/10/21...

Abstract

Elastic properties of leucite have been investigated using resonant ultrasound spectroscopy over a temperature range from 300 to 1400 K. According to these measurements, elastic moduli soften by ~50% at the Ia3d-I41/acd ferroelastic transition temperature Tc1 = 940 K relative to the value at 1400 K. A second softening is observed at Tc2 = 920 K, corresponding to the structural change from the space group I41/acd to I41/a. These elastic anomalies are analyzed in a simple model under the assumption that the transitions observed at Tc1 and Tc2 can be approximated by a single pseudoproper ferroelastic transition. The two phase transitions are accompanied by a single peak in mechanical damping attributed to the high mobility of twin walls in the intermediate phase followed by pinning in the low-temperature phase. To determine whether twin walls in tetragonal leucite are polar, resonant piezoelectric spectroscopy and second harmonic generation measurements were performed, but no evidence of polarity was found.

Item Type: Article
Uncontrolled Keywords: 2015AREP; IA69; weekly list
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: American Mineralogist
Volume: 100
Page Range: pp. 2159-2162
Identification Number: 10.2138/am-2015-5313CCBY
Depositing User: Sarah Humbert
Date Deposited: 23 Dec 2015 15:45
Last Modified: 23 Dec 2015 15:45
URI: http://eprints.esc.cam.ac.uk/id/eprint/3537

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