Fracture Toughness Anisotropy of Sodium β- Alumina

doi:10.1111/j.1151-2916.1983.tb10573.x

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Wiley InterScience

Journal of the American Ceramic Society

Volume 66 Issue 11, Pages c204 - c205

Published Online: 2 Jun 2006

Published on behalf of the American Ceramic Society (ACerS)

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Fracture Toughness Anisotropy of Sodium β- Alumina

David C. Hitchcock⋆ ¹ Lutgard C. De Jonghe⋆ ¹

¹ Materials and Molecular Research Division, Lawrence Berkeley Laboratory and Department of Materials Science and Mineral Engineering, University of California, Berkeley, California 94720

Supported by the U.S. Department of Energy unde: Contract No. DE-AC03-76SF00098.

⋆Member, the American Ceramic Society.

CONTRIBUTING EDITOR— R. J. STOKES

ABSTRACT

The fracture toughness anisotropy was determined for sodium p-alumina single crystals, using a hardness indent method. For cracks with a habit plane normal to the 00.1 planes, the fracture toughness is ∼2 MPa.m¹¹², whereas for cracks running parallel to the 00.1 planes, it is ∼0.16 MPa.m¹¹². This extreme anisotropy may partly explain the difference between calculated and observed critical current densities jor mode I failure initiation of poly crystalline solid electrolytes.

Received June 21, 1983; revised copy received August 1, 1983; approved August 9, 1983.

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1151-2916.1983.tb10573.x About DOI