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Bulk Modulus and Young's Modulus of Nanocrystalline γ‐Alumina
Author(s) -
Gallas Marcia R.,
Piermarini Gasper J.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb04524.x
Subject(s) - bulk modulus , nanocrystalline material , materials science , modulus , isothermal process , composite material , equation of state , young's modulus , atmospheric temperature range , compression (physics) , diffraction , aggregate modulus , hydrostatic pressure , mineralogy , thermodynamics , dynamic modulus , dynamic mechanical analysis , chemistry , optics , nanotechnology , physics , polymer
Compression measurements were performed for the first time on nanocrystalline γ‐alumina utilizing a diamond anvil cell (DAC) and the energy dispersive X‐ray diffraction method. The cubic unit cell ( a = 0.7924 nm) for γ‐alumina was found to have a volume compression of about 2.4% over the pressure range from ambient to 3.8 GPa at room temperature under both hydrostatic and nonhydrostatic conditions. Using the first‐order Bridgman equation and the Birch equation of state, the isothermal bulk modulus ( B 0 ) was determined to be 162 ± 14 GPa and Young's modulus ( E ) was estimated to be 253 ± 22 GPa assuming a Poisson's ratio for γ‐alumina of 0.24 ± 0.2.