Measurements of the effect of hydrostatic pressure on ultrasonic wave velocities have been used to determine the pressure derivatives of the elastic stiffness of uranium nitride at room temperature.∂C 44/∂P, and hence the Grüneisen parameter for the transverse mode propagating down an 〈001〉 axis, is negative; however, this mode softening is not anomalous for rocksalt structure crystals. The Grüneisen gammas of the acoustic modes obtained in the long wavelength limit have a pronounced anisotropy which accrues largely from the presence or absence of contributions to modes of vibration from nearest-neighbour repulsive forces. The compression of uranium nitride calculated from the Murnaghan equation of state is much smaller than those of the alkali halides or IV–VI compounds because this compound is much stiffer.
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Salleh, M.D., MacDonald, J.E., Saunders, G.A. et al. Hydrostatic pressure dependences of elastic constants and vibrational anharmonicity of uranium nitride. J Mater Sci 21, 2577–2580 (1986). https://doi.org/10.1007/BF01114310
- Hydrostatic Pressure
- Ultrasonic Wave