Premium
Low‐Temperature Lattice Specific Heat of CuAl
Author(s) -
Bijalwan R. D.,
Ram P. N.
Publication year - 1982
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.2221130233
Subject(s) - impurity , specific heat , lattice (music) , condensed matter physics , thermodynamics , copper , aluminium , lattice constant , chemistry , materials science , physics , quantum mechanics , metallurgy , acoustics , diffraction
The low‐temperature lattice specific heat of dilute copper—aluminium alloys are analysed on the basis of Gree 2 2+ s function theory. An impurity model, which includes mass‐change at the impurity site and nearest neighbour central and noncentral force constant changes, is employed. The effect of volume change is also taken into account. The calculated results are in agreement with experimental measurements. Reduction in lattice specific heat is dominated by contribution from F 1u irreducible representation. The calculated localized mode frequency on the basis of the defect model is in reasonable agreement with experimental value. The role of localized modes in understanding the change in lattice specific heat is discussed.