X-ray studies of thermal expansion in solid N2O

X-ray structural studies of solid N2O were performed over the temperature range 6−150°K. The experimentally determined temperature dependence of the lattice constant was used to determine density, molar volume, and thermal expansion coefficient of the compound. The specific heat at constant volume, Grüneisen coefficient, and adiabatic and isothermal compressibilities were calculated. The contributions of translational and librational oscillations of the molecules to heat capacity and thermal expansion of the crystal were separated. It was established that within the framework of the classical law of corresponding states the phonon component of N2O thermal expansion in the high temperature range agrees well with data from x-ray studies of solid Ar. The contribution of lattice oscillation anharmonicities to Cv is considered. It is shown by analysis of thermodynamic properties that the electrostatic quadrupole moment of the N2O molecule comprises 5.0 · 10−24 cgs units.

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