Improper ferroelectricity in lawsonite CaAl <sub>2</sub> Si <sub>2</sub> O <sub>7</sub>(OH)<sub>2</sub>·H<sub>2</sub> O: hysteresis and hydrogen ordering

Salje, E. K. H. and Crossley, S and Kar-Narayan, S and Carpenter, M. A. and Mathur, N D (2011) Improper ferroelectricity in lawsonite CaAl <sub>2</sub> Si <sub>2</sub> O <sub>7</sub>(OH)<sub>2</sub>·H<sub>2</sub> O: hysteresis and hydrogen ordering. Journal of Physics: Condensed Matter, 23 (22). p. 222202. DOI 10.1088/0953-8984/23/22/222202

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Abstract

Ferroelectric hysteresis measurements on ceramic lawsonite show a temperature dependence of the remanent polarization Pr = PoΘs(cothΘs/T − cothΘs/Tc) ~ Q2, Θs = 26 K, where Q is the thermodynamic order parameter of the phase transition Pmcn–P 21cn. This almost linear temperature evolution of Pr proves the improper nature of ferroelectricity in lawsonite. The Curie temperature is Tc = 124 K. The phase transition is strictly continuous, with a weak conjugated field near the transition point, and hydrogen ordering is discussed as the primary driving mechanism.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Journal or Publication Title: Journal of Physics: Condensed Matter
Volume: 23
Page Range: p. 222202
Identification Number: 10.1088/0953-8984/23/22/222202
Depositing User: Sarah Humbert
Date Deposited: 12 Aug 2011 15:56
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2166

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