Abstract
The unit cell parameters of clathrate hydrates of ethylene oxide and tetrahydrofuran have been measured from 20 to 250 K by X-ray powder diffraction. The coefficients of linear expansion for the two clathrate hydrates are of comparable magnitude and larger than that for hexagonal ice. The larger thermal expansivity in the hydrates indicates a greater anharmonicity in the crystal potential. A positive deviation of the Gruneisen parameter at low temperature was observed. The characteristic Debye temperature and the moments of the lattice vibrational density of states of the hydrate have been evaluated from quasi-harmonic theory.
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