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Low-Temperature Elastic Coefficients of Polycrystalline Indium



K Sudook, H M. Ledbetter


Using an ultrasonic pulse-echo method, we measured the elastic coefficients of polycrystalline indium from 300 to 5K. All elastic coefficients showed regular temperature behavior, as predicted by an Einstein-oscillator model. The shear and Young moduli showed the largest change, increasing {difference of} 55% during cooling. The Poisson ratio was unusally high at 0.45, just below the theoretical upper bound of 0.5. Using a Marz composite oscillator, we measured the internal fraction at room temperature. We calculated the acoustic Debye temperature, 108.4 K. that agreed well with a monocrystal acoustic value, 111.3 K and the specific-heat value, 108.8 K. Also, we calculated the Gruneisen parameters γL = 2.04 γH = 2.68, that agreed well with the specific-heat value, γ=2.48 and the shock-wave value, γ=2.24.
Materials Science and Engineering
No. A252


Debye characteristic temperature, elastic constants, gruneisen parameter, indium, internal friction, low temperatures, marx oscillator, pulse-echo method


Sudook, K. and Ledbetter, H. (1997), Low-Temperature Elastic Coefficients of Polycrystalline Indium, Materials Science and Engineering (Accessed November 30, 2023)
Created November 1, 1997, Updated February 17, 2017