Thermodynamic properties and the equation of state of alkali hydride crystals

Lighter Alkali Hydride and Deruteride. Electronic Properties of Pure Solids

“…They proposed a repulsive interaction of the form @ ( r ) f ( 6 , cp), wheref (8, cp) has cubic symmetry and @(r) is the Born-Mayer (BM) repulsion interaction taken from quantum mechanical calculations. Srivastava et al [58] have utilized a three-body interaction potential in the framework of Lundqvist's three-body interaction [59] and calculated some thermodynamic properties of the alkali hydrides. Models of noncentral type (the so-called force constant models) which have been introduced mainly to study lattice dynamics will not be discussed here.…”

Crystal anharmonicity in Li(H,D) and Na(H,D) systems

“…For many lattice types the Griineisen parameter y shows weak dependence only on the frequency. The average value of this parameter for lighter alkali halides is around 1.6 [38,391 and is relatively independent of the material. Slack [40] reports a value of y = 1.4 for LiH obtained from the thermal expansion measurements of Fieldhouse et al [41] and the elastic constants of Haussiihl and Skorczyk [42].…”