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The model of the phase transition in squaric acid
Author(s) -
Schneider V. E.,
Tornau E. E.
Publication year - 1981
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.2221070212
Subject(s) - squaric acid , phase transition , cluster (spacecraft) , transition (genetics) , phase (matter) , quantum tunnelling , statistical physics , order (exchange) , condensed matter physics , thermodynamics , materials science , physics , chemistry , quantum mechanics , computer science , organic chemistry , biochemistry , gene , programming language , finance , economics
A statistical model of phase transition in squaric acid (C 4 H 2 O 4 and C 4 D 2 O 4 ) crystals is proposed. The thermodynamical properties of the transition are investigated by a five‐particle cluster approximation not taking into account the tunneling motion of protons. It is shown that the phase transition in the analysed model can be of both first and second order. A comparison with recent experimental data is carried out.