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Elastic Properties of Mullite
Author(s) -
Ledbetter Hassel,
Kim Sudook,
Balzar Davor,
Crudele Scott,
Kriven Waltraud
Publication year - 1998
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.1151-2916.1998.tb02441.x
Subject(s) - mullite , crystallite , materials science , poisson's ratio , moduli , elastic modulus , poisson distribution , shear modulus , elasticity (physics) , shear (geology) , composite material , condensed matter physics , thermodynamics , mineralogy , chemistry , metallurgy , physics , mathematics , ceramic , statistics , quantum mechanics
Using ultrasonic methods, we determined the ambient‐temperature elastic constants of dense (99.7%) hot‐pressed polycrystalline 3:2 mullite (3Al 2 O 3 2SiO 2 ). We report the usual polycrystal elastic constants: Young's, shear, and bulk moduli, and the Poisson's ratio (nu). The Poisson's ratio (nu = 0.280) suggests interatomic bonding that is very different from that of either alumina or silica. Temperature dependences of the elastic constants show a strong irregularity; for example, nu decreases as the temperature increases. This irregularity suggests an internal‐state change that is perhaps related to the incommensurate structural modulation.