Elastic properties of mullite

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1998.tb02441.x· OSTI ID:638366

Ledbetter, H; Kim, S; Balzar, D ^[1]; Crudele, S; Kriven, W ^[2]

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1. National Inst. of Standards and Technology, Boulder, CO (United States)
2. Univ. of Illinois, Urbana, IL (United States). Materials Science and Engineering Dept.

Using ultrasonic methods, the authors determined the ambient-temperature elastic constants of dense (99.7%) hot-pressed polycrystalline 3:2 mullite (3Al{sub 2}O{sub 3}{center_dot}2SiO{sub 2}). The authors 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.

• Sponsoring Organization: USDOE
• OSTI ID: 638366
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 81; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
ELASTICITY
MULLITE
TEMPERATURE DEPENDENCE
ULTRASONIC TESTING
X-RAY DIFFRACTION