Temperature Dependence of the Adiabatic Elastic Moduli of Single-Crystal Alpha Uranium

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Abstract
The ultrasonic‐wave velocities in small alpha‐uranium single crystals have been measured at various temperatures using the phase‐comparison technique. Details in the experimental procedure, direct computation of the stiffness moduli, and cross‐checking by indirect methods are given. The temperature dependence of the moduli are reported for the range −195° to +300°C for c11, c22, and c33 and −195° to +35°C for the remaining 6 principal moduli. The results show a very marked abnormal temperature dependence of the elasticity in the [100] direction; c11 decreases with temperature below −17.2°C and the linear compressibility in [100] increases from +35° to −195°C. The bulk modulus passes through a maximum at −100°C. These abnormalities indicate a strong temperature dependence of the electron interactions involved in the second nearest‐neighbor bond.

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