FAST TRACK COMMUNICATION: Improper ferroelectricity in lawsonite CaAl sub(2)Si sub(2)O sub(7 )(OH) sub(2)[middot]H sub(2)O: hysteresis and hydrogen ordering

Ferroelectric hysteresis measurements on ceramic lawsonite show a temperature dependence of theremanent polarization P sub(r) = P sub(o)[Theta] sub(s)(coth [Theta] sub(s)/T - coth [Theta] sub(s)/T sub(c)) ~ Q super(2), [Theta]s = 26 K, where Q is the thermodynamic order parameter of the phase transi...

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Published inJournal of physics. Condensed matter Vol. 23; no. 22; pp. 1 - 6
Main Authors Salje, E K H, Crossley, S, Kar-Narayan, S, Carpenter, M A, Mathur, N D
Format Journal Article
LanguageEnglish
Published 08.06.2011
Subjects
Condensed matter
Curie temperature
Evolution
Ferroelectricity
Hysteresis
Order disorder
Phase transformations
Transition points
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Summary:Ferroelectric hysteresis measurements on ceramic lawsonite show a temperature dependence of theremanent polarization P sub(r) = P sub(o)[Theta] sub(s)(coth [Theta] sub(s)/T - coth [Theta] sub(s)/T sub(c)) ~ Q super(2), [Theta]s = 26 K, where Q is the thermodynamic order parameter of the phase transition Pmcn-P2 sub(1)cn. This almost linear temperature evolution of P sub(r) proves the improper nature of ferroelectricity in lawsonite. The Curie temperature is T sub(c) = 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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
content type line 23
ObjectType-Feature-1
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/22/222202