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The Effect of Giant Striction and Thermal Expansion Anomalies in Systems with Structural Instabilities
Author(s) -
Solontsov A. Z.,
Orlov V. K.
Publication year - 1991
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.2221680109
Subject(s) - thermal expansion , magnetostriction , condensed matter physics , phase transition , phase (matter) , negative thermal expansion , thermal , physics , plutonium , uranium , thermodynamics , quantum mechanics , magnetic field , nuclear physics
A simple fluctuation theory analogous to the spin‐fluctuation theory of the magneto‐volume effect is presented to discuss the phenomenon of giant striction, associated with displacive phase transitions, and thermal expansion anomalies. It is argued that the giant striction accompanying the phase transition to the incommensurate charge density wave state is responsible for the low temperature anomalous expansion of α‐uranium and α‐plutonium. The spontaneous striction values in these materials are estimated to be 4.57 × 10 −3 and 1.82 × 10 −2 comparable with those known for systems with giant magnetostriction.