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Knoop microhardness measurements on lithium niobate and lithium tantalate

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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 C 66 is close to 0.1, which is usually found in covalent-bonded solids.

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Authors and Affiliations

  1. Bell Laboratories, Murray Hill, New Jersey, USA

    H. Brown, A. A. Ballman & G. Y. Chin

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  1. H. Brown
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  2. A. A. Ballman
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  3. G. Y. Chin
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Brown, H., Ballman, A.A. & Chin, G.Y. Knoop microhardness measurements on lithium niobate and lithium tantalate. J Mater Sci 10, 1157–1160 (1975). https://doi.org/10.1007/BF00541397

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  • DOI: https://doi.org/10.1007/BF00541397

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