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Mean‐Square Displacements for NH 4 Cl and ND 4 Cl Crystals
Author(s) -
Kurittu J.,
Merisalo M.
Publication year - 1976
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.2220740118
Subject(s) - ion , mean square , square lattice , vibration , square (algebra) , lattice vibration , phonon , ammonium , molecule , eigenvalues and eigenvectors , chemistry , crystallography , materials science , molecular physics , physics , condensed matter physics , mathematics , geometry , mathematical analysis , quantum mechanics , ising model , organic chemistry
The mean‐square displacements for NH 4 Cl and ND 4 Cl crystals at various temperatures between 85 K and 165 K have been calculated from the eigenfrequencies and eigenvectors of the phonon states as obtained from a rigid ion‐rigid molecule model of lattice dynamics, and from the internal vibrations of ammonium ions. The calculated results are discussed in relation to available experimental data.