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Ferroelasticity, Pseudoelasticity, and Shape Memory Effect in an Ionic Material Pb3(PO4)2

Published online by Cambridge University Press:  25 February 2011

Y. Yamada
Y. Yamada*
Affiliation:
Institute for Solid State Physics, The University of Tokyo, Roppongi, Minato-ku, Tokyo 106, Japan
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Abstract

A theory of pseudoelasticity is developed within the framework of the phenomenological Ginzburg-Landau Scheme. The system with ℈stripe℉-type ferroelastic domain structure has been discussed using Transfer-Integral method, which directly gives the equillibrium density of domain boundaries and the response of domain pattern against the external stress. The results are applied to the case of Pb3(PO4)2, an ionic ferroelastic material which shows pseudoelasticity and shape memory effect. It is suggested that in this particular case, random stress field is mainly responsible for pseudoelastic behavior. The observed stressstrain curve has been analyzed quantitatively from this standpoint. The origin of the two-way shape memory effect has also been inferred qualitatively from the same stand point.

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