Low-Temperature Elastic Coefficients of Polycrystalline Indium

Published

November 1, 1997

Author(s)

K Sudook, H M. Ledbetter

Abstract

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 γ_L = 2.04 γ_H = 2.68, that agreed well with the specific-heat value, γ=2.48 and the shock-wave value, γ=2.24.

Citation

Materials Science and Engineering

Volume

No. A252

Pub Type

Journals

Keywords

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

Citation

Sudook, K. and Ledbetter, H. (1997), Low-Temperature Elastic Coefficients of Polycrystalline Indium, Materials Science and Engineering (Accessed October 16, 2025)