Negative bulk modulus and possibility of loss of elastic stability near tricritical transitions in thin films on substrates

Within the Landau-like approach we study anomalies of elastic moduli at phase transitions in thin films on substrates. We consider the case where, similar to many experimental cases, the first-order transition in free crystal would convert into a second order in the film if the system remained homog...

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Bibliographic Details
Published in:Ferroelectrics 2016-08, Vol.500 (1), p.116-128
Main Authors: Levanyuk, A. P., Minyukov, S. A., Misirlioglu, I. B.
Format: Article
Language:English
Subjects:
Bulk modulus
Crystals
elastic moduli
Ferroelectric materials
Films on substrates
Modulus of elasticity
Phase transformations
phase transition anomalies
Phase transitions
Stability
Substrates
Thin films
X-rays
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Summary:Within the Landau-like approach we study anomalies of elastic moduli at phase transitions in thin films on substrates. We consider the case where, similar to many experimental cases, the first-order transition in free crystal would convert into a second order in the film if the system remained homogeneous. It is shown, however, that apart from its questionable thermodynamic advantages, the homogeneous state of low-symmetry phase may become absolutely unstable which is signaled by changing of sign of its bulk modulus.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2016.1236608