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Knoop indentation; microhardness; anisotropy; anthracene; phenanthrene

Microhardness anisotropy in single crystals of anthracene and phenanthrene has been observed by the Knoop indentation technique. The Knoop hardness variation with respect to the [010] direction shows opposite trends. Both these crystals have the same crystal structure and space group. The present observations are explained in terms of orientation and disposition of molecules in the unit cells.

Nimisha Vaidya¹ M J Joshi¹ B S Shah¹ D R Joshi^{1 2}

1. Solid State Physics and Materials Science Laboratories, Department of Physics, Saurashtra University, Rajkot - 360 005, India
2. Applied Physics Department, Faculty of Technology and Engineering, M. S. University of Baroda, Vadodara - 390 002, India

Published

December 1997

Manuscript received

17 April 1997

Manuscript revised

6 August 1997