• Proceedings of the XVIII St. Petersburg Readings on the Problems of Crystal Strength and Growth Dedicated to the Memory of A.V. Stepanov
  • Published:

Sapphire hardness in different crystallographic directions


The sapphire hardness in different crystallographic planes has been investigated in a wide range of indenter loads. It is shown that the sapphire microhardness is approximately the same for different crystallographic directions: 22–23 GPa. The resistance to the indenter penetration decreases with an increase in the load, especially strongly in the basal plane.

This is a preview of subscription content, log in to check access.


  1. 1.

    Sinani, A.B., Vlasov, A.S., Zil’berbrand, E.L., et al., Izv. Ross. Akad. Nauk, Ser. Fiz., 2004, vol. 68, no. 6, p. 810.

    Google Scholar 

  2. 2.

    Ikornikova, I.Yu., Tr. In-ta Kristallografii Akad. Nauk SSSR, 1953, no. 8, p. 293.

  3. 3.

    Dobrovinskaya, E., Lytvynov, L., and Pischik, V., Sapphire in Science and Engineering, Kharkov: STC Institute of Single Crystal NAS of Ukraine 2007, p. 480.

    Google Scholar 

  4. 4.

    Sinani, A.B., Zil’berbrand, E.L., and Stepanov, M.I., Proc. Int. Conf. VII Khariton Readings, Sarov, 2005, p. 376.

  5. 5.

    Sinani, A.B., Pis’ma Zh. Tekh. Fiz., 2003, vol. 29, no. 19, p. 48 [Tech. Phys. Lett. (Engl. Transl.), vol. 29, no. 19, p. 813].

    Google Scholar 

Download references

Author information



Corresponding author

Correspondence to A. B. Sinani.

Additional information

Original Russian Text © A.B. Sinani, N.K. Dynkin, L.A. Lytvinov, P.V. Konevsky, E.P. Andreev, 2009, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2009, Vol. 73, No. 10, pp. 1463–1465.

About this article

Cite this article

Sinani, A.B., Dynkin, N.K., Lytvinov, L.A. et al. Sapphire hardness in different crystallographic directions. Bull. Russ. Acad. Sci. Phys. 73, 1380 (2009). https://doi.org/10.3103/S1062873809100177

Download citation


  • Sapphire
  • Crystallographic Plane
  • Crystallographic Direction
  • Load Dependence
  • High Speed Impact