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λ‐transition of NH 4 Cl and ND 4 Cl at high pressures
Author(s) -
Yurtseven H.,
Salihoğlu S.,
Şen S.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642154
Subject(s) - phase diagram , phase transition , chemistry , thermodynamics , solid solution , line (geometry) , high pressure , phase (matter) , analytical chemistry (journal) , physics , mathematics , geometry , organic chemistry , chromatography
Abstract We predict in this study using the mean‐field theory, the phase‐line equation from the free energy expanded in terms of the order parameters of solid II and III phases of NH 4 Cl and ND 4 Cl close to the λ‐phase transitions at high pressures. Using the temperature and pressure dependence of the coefficients given in the phase‐line equation, it is shown that the experimentally observed T – P phase diagram for the solid II–solid III transition, can be predicted from the mean field model studied here for both crystalline structures. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)