Abstract
The complete set of elastic moduli for the simple hexagonal alloy Sn 0.8In 0.2(γ-Sn) is determined above liquid nitrogen temperature, using a non-contact electromagnetic technique for the excitation and detection of ultrasound. The values obtained are compared with the data for the body-centered tetragonal structure of β-Sn on the basis of the orientational relationship between these two modifications of tin. The temperature dependencies of the longitudinal and transverse sound velocities show pronounced softening below liquid nitrogen temperatures, which can be attributed to successive phase transitions first to the unstable γ'-Sn structure and then to the β-Sn structure.
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