Elastic properties of mullite

Hassel Ledbetter, Sudook Kim, Davor Balzar, Scott Crudele, Waltraud Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

Using ultrasonic methods, we determined the ambient-temperature elastic constants of dense (99.7%) hot-pressed polycrystalline 3:2 mullite (3Al2O3·2SiO2). We report the usual polycrystal elastic constants: Young's, shear, and bulk moduli, and the Poisson's ratio (v). The Poisson's ratio (v = 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, v decreases as the temperature increases. This irregularity suggests an internal-state change that is perhaps related to the incommensurate structural modulation.

Original languageEnglish (US)
Pages (from-to)1025-1028
Number of pages4
JournalJournal of the American Ceramic Society
Volume81
Issue number4
DOIs
StatePublished - Apr 1998

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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