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Pressure Dependence of the Elastic Constants of Single Crystalline Aluminum Oxide
Author(s) -
Gieske J. H.,
Barsch G. R.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680290113
Subject(s) - superposition principle , lattice constant , lattice (music) , hydrostatic pressure , pseudopotential , condensed matter physics , thermodynamics , hexagonal crystal system , aluminium , materials science , hexagonal lattice , k nearest neighbors algorithm , equation of state , hydrostatic equilibrium , bulk modulus , single crystal , oxide , chemistry , crystallography , physics , diffraction , optics , composite material , quantum mechanics , metallurgy , artificial intelligence , antiferromagnetism , computer science , acoustics
The six single crystal elastic constants of aluminum oxide have been measured by the ultrasonic pulse superposition method at 25 °C as a function of hydrostatic pressure up to 10 kbar. A linear pressure dependence has been found in all cases. The results are compared and found to agree approximately with theoretical data for the hexagonal close‐packed structure with nearest neighbor central forces. They are also used to calculate the pressure dependence of the lattice parameters from Thurston's equation of state. The agreement with directly measured experimental data of Hart and Drickamer is excellent for one, and poor for the other lattice parameter.