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


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.


Polymer Anisotropy Crystal Structure Lithium Hexagonal 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    G. Y. Chin, M. L. Green and L. G. Van Uitert, J. Mater. Sci. 8 (1973) 1421.Google Scholar
  2. 2.
    R. H. Hannink, D. L. Kohlstedt and M. J. Murray, Proc. Roy. Soc. Lond. A 326 (1972) 409.Google Scholar
  3. 3.
    L. G. Tsinzerling, E. S. Berkovich, L. A. Szsoev and M. P. Shaskol'skaza, Sov. Phys. Cryst. 4 (1970) 897.Google Scholar
  4. 4.
    C. F. Cline and J. S. Kahn, J. Electrochem. Soc. 110 (1963) 773.Google Scholar
  5. 5.
    S. C. Abrahams, J. M. Reddy and J. L. Bernstein, J. Phys. Chem. Solids 27 (1966) 997.Google Scholar
  6. 6.
    S. C. Abrahams and J. L. Bernstein, ibid 25 (1967) 1685.Google Scholar
  7. 7.
    A. A. Ballman, H. J. Levinstein, C. D. Capio and H. Brown, J. Amer. Ceram. Soc. 50 (1967) 657.Google Scholar
  8. 8.
    R. C. Miller and A. Savage, Appl. Phys. Letters 9 (1966) 169.Google Scholar
  9. 9.
    A. W. Warner, M. Onoe and G. A. Coquin, J. Acous. Soc. Amer. 42 (1967) 1223.Google Scholar
  10. 10.
    R. T. Smith and F. S. Welsh, J. Appl. Phys. 6 (1971) 2219.Google Scholar
  11. 11.
    J. Noda and I. Ida, Rev. Elect. Commun. Lab. 20 (1972) 152.Google Scholar
  12. 12.
    N. W. Thibault and H. L. Nyquist, Trans. of the A.S.M. 38 (1947) 271.Google Scholar
  13. 13.
    G. E. Peterson and P. M. Bridenbaugh, J. Chem. Phys. 48 (1968) 3402.Google Scholar
  14. 14.
    M. E. Lines, Phys. Rev. B 2 (1970) 698.Google Scholar
  15. 15.
    G. Y. Chin, Proceedings of the Symposium on Plastic Deformation of Ceramic Materials, Penn. State Univ., June, 1974, in press.Google Scholar
  16. 16.
    C. A. Brookes, J. B. O'Neill and B. A. W. Redfern, Proc. Roy. Soc. Lond. A 322 (1971) 73.Google Scholar

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

Personalised recommendations