Low-Temperature Elastic Constants of Polycrystalline Indium
Sudook A. Kim, H M. Ledbetter
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 γL=2.04, γH=2.68 that agree well with the specific-heat value γ=2.48 and the shock-wave value γ=2.24.
Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
and Ledbetter, H.
Low-Temperature Elastic Constants of Polycrystalline Indium, Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
(Accessed December 2, 2023)