Arsenic pentoxide: A model ferroelastic transition?

Simon A.T. Redfern

doi:10.1080/00150199008214586

Arsenic pentoxide: A model ferroelastic transition?

Simon A.T. Redfern^*

^*Corresponding author for this work

University of Manchester

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The tetragonal-orthorhombic phase transition in As₂O₅ is considered as a model example of ferroelastic behaviour, with the spontaneous strain acting as the order parameter. Second-order Landau theory is observed over a very large temperature interval with critical exponent β = ½ and ϰ=l. In the simplest model case, it should be possible to describe the transition in terms of a single driving order parameter corresponding to acoustic mode softening, but coupled optic distortions are also observed. The energetic influence of this coupling is discussed.

Original language	English
Pages (from-to)	219-224
Number of pages	6
Journal	Ferroelectrics
Volume	106
Issue number	1
DOIs	https://doi.org/10.1080/00150199008214586
Publication status	Published - Jun 1 1990
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Arsenic pentoxide: A model ferroelastic transition?",

abstract = "The tetragonal-orthorhombic phase transition in As2O5 is considered as a model example of ferroelastic behaviour, with the spontaneous strain acting as the order parameter. Second-order Landau theory is observed over a very large temperature interval with critical exponent β = ½ and ϰ=l. In the simplest model case, it should be possible to describe the transition in terms of a single driving order parameter corresponding to acoustic mode softening, but coupled optic distortions are also observed. The energetic influence of this coupling is discussed.",

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AB - The tetragonal-orthorhombic phase transition in As2O5 is considered as a model example of ferroelastic behaviour, with the spontaneous strain acting as the order parameter. Second-order Landau theory is observed over a very large temperature interval with critical exponent β = ½ and ϰ=l. In the simplest model case, it should be possible to describe the transition in terms of a single driving order parameter corresponding to acoustic mode softening, but coupled optic distortions are also observed. The energetic influence of this coupling is discussed.

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Arsenic pentoxide: A model ferroelastic transition?

Abstract

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