Premium
Effect of Isotope Substitution on Thermal Expansion of LiH Crystal
Author(s) -
Tyutyunnik V. I.
Publication year - 1992
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.2221720205
Subject(s) - thermal expansion , isotope , ion , kinetic isotope effect , lattice (music) , chemistry , thermal , crystal structure , atomic mass , atomic physics , materials science , thermodynamics , crystallography , nuclear physics , physics , deuterium , organic chemistry , acoustics
The isotope effect on the lattice parameter and the coefficient of thermal expansion of the LiH crystal is investigated by means of rigid‐ion model. It is demonstrated that the differences in lattice parameters between LiH isotopes can be related directly to changes in the thermal‐expansion coefficient which varies inversely as the cation‐anion reduced mass. These differences should disappear at a temperature of 0 K. For the first time, the thermal‐expansion data are calculated for the six isotopic components 6 LiH, 7 LiH, 6 LiD, 7 LiD, 6 LiT, and 7 LiT. The lattice parameters of LiH isotopes are also calculated and agree with those observed earlier within the experimental error.