Journal of Materials Science

, Volume 10, Issue 7, pp 1157–1160 | Cite as

Knoop microhardness measurements on lithium niobate and lithium tantalate

  • H. Brown
  • A. A. Ballman
  • G. Y. Chin
Papers

Abstract

Knoop microhardness measurements were made on the (11.0), (01.0) and (00.1) planes of the trigonal isostructural compounds lithium niobate and lithium tantalate. The data indicate uniform hardness in the 〈11.0〉 and 〈01.0〉 directions and greater hardness in the [00.1] direction. In accordance with previous findings of hardness anisotropy in materials with hexagonal crystal structure, the present data indicate preferred slip on basal planes. The ratio of hardness to the shear modulus C66 is close to 0.1, which is usually found in covalent-bonded solids.

Keywords

Polymer Anisotropy Crystal Structure Lithium Hexagonal 

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Copyright information

© Chapman and Hall Ltd. 1975

Authors and Affiliations

  • H. Brown
    • 1
  • A. A. Ballman
    • 1
  • G. Y. Chin
    • 1
  1. 1.Bell LaboratoriesMurray HillUSA

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