Bulletin of Materials Science

, Volume 22, Issue 1, pp 15–16 | Cite as

Effects of anisotropy and annealing on microhardness of In x Bi2−x Te3 (x=0·1 to 0·5) single crystals

  • G R Pandya
  • S R Bhavsar
  • P H Soni
Mechanical Properties


The crystals of In x Bi2−x Te3 (x=0·1 to 0·5) have been grown by zone-melting method. In order to study anisotropy exhibited by the (0001) plane of the crystals, the directional hardness was determined by producing indentations at various azimuthal orientations of the indentor with respect to the surface over a range 0–180°. The crystal was rotated about the indentor axis in steps of 15° while keeping applied load and loading time constant at 50 g and 20 sec, respectively. For annealing study, the sample was kept at a temperature of 375°C. It was observed that softening of crystal takes place and the hardness decreases to a considerable extent.


Anisotropy annealing hardness 


  1. Arivuoli D, Gnanam F D and Ramasamy P 1988J. Mater. Sci. Lett. 7 711CrossRefGoogle Scholar
  2. Bhatt V P, Patel R M and Desai C F 1983Cryst. Res. & Technol. 18 1173CrossRefGoogle Scholar
  3. Braunovic M 1973The science of hardness testing and its research applications (eds) J H Westbrook and H Conard (Ohio: ASM) p. 329Google Scholar
  4. Buckle H 1951Rev. Metall. 48 957Google Scholar
  5. Drabble J R 1963Progress in semiconductors (eds) A F Gibson and R E Burgess (New York: John Wiley & Sons Inc.) Vol.7, p. 47Google Scholar
  6. Ha H P, Cho Y W, Byun H Y and Shim J D 1994J. Phys. Chem. Solids 55 1233CrossRefGoogle Scholar
  7. Jani T M, Pandya G R and Desai C F 1994Cryst. Res. & Technol. 29 1CrossRefGoogle Scholar
  8. Jansa L, Lostak P, Sramkova J and Horak J 1992J. Mater. Sci. 27 6062CrossRefGoogle Scholar
  9. Mott B W 1956Microindentation hardness testing (London: Butterworths Scientific Publications) Ch. 1Google Scholar
  10. Pandya N S, Bhatt V P, Vyas A R and Dandya G R 1977Indian J. Pure & Appl. Phys. 15 750Google Scholar
  11. Sagar A and Faust J W Jr 1967J. Appl. Phys. 38 482CrossRefGoogle Scholar
  12. Testardi L R and Burstein E 1972Phys. Rev. B6 460Google Scholar
  13. Vyas S M, Pandya G R and Desai C F 1995Indian J. Pure & Appl. Phys. 33 191Google Scholar

Copyright information

© Indian Academy of Sciences 1999

Authors and Affiliations

  • G R Pandya
    • 1
  • S R Bhavsar
    • 1
  • P H Soni
    • 1
  1. 1.Department of Physics, Faculty of ScienceThe MS University of BarodaVadodaraIndia

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