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Stiffness matrix and debye temperature of ReO3 from ultrasonic measurements
Authors:TP Pearsall  LA Coldren
Institution:Bell Laboratories, Holmdel, NJ 07733, U.S.A.
Abstract:We have measured the propagation velocities of bulk acoustic waves in the simple cubic transition-metal oxide ReO3 by ultrasonic pulse propagation. The elastic stiffness constants at 300 K are: C11 = (47.9 ± 1.4) × 1011 dyne/cm2; C44 = (6.1 ± 0.2) × 1011 dyne/cm2; C12 = (?0.7 ± 2.8) × 1011 dyne/cm2. These elastic constants indicate a crystal with highly anisotropic shear propagation. The Debye temperature of the compound from these measurements is 528 K. This value is somewhat higher than previous results from specific heat and resistivity determinations.
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