Elastic constant pressure derivatives and stability of the bcc phase of InTl alloys |
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Authors: | G.A. Saunders Y.K. Yoḡurtçu |
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Affiliation: | School of Physics, University of Bath, Bath BA2 7AY, UK;Atatürk University, Faculty of Science, Department of Physics, Erzurum, Turkey |
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Abstract: | Hydrostatic-pressure derivatives of the elastic stiffness constants have been measured ultrasonically in a bcc InTl alloy of composition near the eutectoid. The shear modulus is small, but does not soften under pressure: the eutectoid reaction is not directly associated with a mode softening shear instability. Anharmonic contributions to the excess vibrational entropy from the q 〈110〉, e 〈10〉 modes which stabilize the bcc structure are small compared with the harmonic contributions. |
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