2002/12/24 by A. N. Aleksandrovskii, V. G. Gavrilko, A. V. Dolbin +3
Physics and Astronomy · #cond-mat.mtrl-sci
paper · pdf · doi:10.1063/1.1582338
published as A.N. Aleksandrovskii, V.G. Gavrilko, A.V. Dolbin, V.B. Esel'son, V.G. Manzhelii, B.G. Udovidchenko, Fiz.Nizk.Temp. 29, 715-721 (June 2003) · 10 pages, 7 figures
arxiv created 2002/12/24 · arxiv updated 2009/11/30
A negative contribution of the CH4 impurity to the thermal expansion of the solution has been revealed in dilatometric studies of solid Kr+0.76% CH4, Kr+5.25% CH4 and Kr+10.5% CH4 solutions at 1-23 K. It is shown that the negative contribution results from changes in the occupancy of the ground state of the A-modifications of isolated CH4 molecules. Assuming that the CH4 impurity singles and clusters contribute to the thermal expansion independently, we can estimate their contributions. The contribution of the singles to the thermal expansion of the solid solution is negative. The energies of the first excitational rotational states were determined for singles and two-body and three-body clusters of CH4 molecules.