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Lattice Mechanics of Molecular Solid Sodium Nitrate
Author(s) -
Singh R. K.,
Chaplot S. L.
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.2221120243
Subject(s) - lattice (music) , sodium , ion , phonon , solid mechanics , lattice energy , chemistry , eigenvalues and eigenvectors , materials science , thermodynamics , physics , condensed matter physics , crystal structure , quantum mechanics , crystallography , metallurgy , acoustics
The lattice mechanics of sodium nitrate with calcite structure is investigated by means of a rigid molecular ion model of the molecular solids employing the external mode formalism. The phonon dispersion curves calculated are in good agreement with those recently measured from the technique of neutron inelastic scattering. The values of the eigenvectors and the cohesive energy obtained for sodium nitrate also appear to be reasonably correct. The possibilities of further improvement and extension of the model are also discussed.