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On the Phase Transition Sequence in Deuterated Betaine Calcium Chloride Dihydrate under Hydrostatic Pressure
Author(s) -
Chaves M. R.,
Almeida A.,
Kiat J. M.,
Tolédano J. C.,
Schneck J.,
Glass R.,
Schwarz W.,
Ribeiro J. L.,
Klöpperpieper A.,
Albers J.
Publication year - 1995
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.2221890112
Subject(s) - hydrostatic pressure , deuterium , phase transition , hydrostatic equilibrium , betaine , chemistry , phase (matter) , neutron scattering , calcium , exponent , thermodynamics , chloride , scattering , physics , atomic physics , optics , organic chemistry , linguistics , philosophy , quantum mechanics
Abstract An elastic neutron scattering study of deuterated betaine calcium chloride dihydrate under hydrostatic pressure is presented. It is shown that a previous phenomenological model based on a one‐dimensional order parameter P , and involving a term of the form P 2 (δ P /δ z ) 2 remains adequate to account satisfactorily for the effects of the hydrostatic pressure. From the study of the temperature dependence of the integrated intensity of the satellites it is inferred that the critical exponent β related to the primary order parameter is close to 0.5 for 2.9 × 10 8 , 3.4 × 10 8 , and 4 × 10 8 Pa.