Low-Temperature Elastic Constants of Polycrystalline Indium

Published

August 1, 1998

Author(s)

Sudook A. Kim, H M. Ledbetter

Abstract

Using an ultrasonic pulse-echo method, we measured the elastic constants of polycrystalline indium from 300 K to 5K. All elastic constants showed regular temperature behavior as predicted by an Einstein-oscillator model. The shear and Young moduli showed the largest change, increasing about 55% during cooling. The Poisson ratio is unusually high: 0.45, just below the theoretical upper bound 0.50. Using a Marx composite oscillator, we measured the internal friction at room temperature. We calculated the acoustic Debye temperature 108.4 K that agrees well with a monocrystal acoustic value 111.3 K and the specific-heat value 108.8 K. Also, er calculated the Grueneisen parameters γ_L=2.04, γ_H=2.68 that agree well with the specific-heat value γ=2.48 and the shock-wave value γ=2.24.

Citation

Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing

Volume

252

Issue

No. 1

Pub Type

Journals

Keywords

Debye characteristic temperature, elastic constants, Gruneisen parameter, indium internal friction, low-temperature, Marx oscillator, pulse-echo method

Citation

Kim, S. and Ledbetter, H. (1998), Low-Temperature Elastic Constants of Polycrystalline Indium, Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing (Accessed October 27, 2025)