Phenomenological interpretation of the critical behaviour of KDP and NH 4 C1 near their tricritical point
- 1 January 1980
- journal article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 25 (1) , 431-434
- https://doi.org/10.1080/00150198008207038
Abstract
Recent order parameter measurements in KDP and NH4C1 near their pressure-induced tricritical point are interpreted using a Landau type free energy expansion of the following form: Good fits are obtained with the simple assumption that the coefficients a and b vary linearly with P and T near the tricritical point where they vanish simultaneously.Keywords
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