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Mechanical properties of meta-nitroaniline NLO single crystals

S. SURESH1,*

Affiliation

  1. Crystal growth centre, Anna University, Chennai-600 025, India

Abstract

Vickers and Knoop microhardness studies were carried out on meta-Nitroaniline crystals grown by a slow evaporation technique over a load range of 10–100 g. The Vickers and knoop microhardness numbers (HV and HK) for the crystal were found out at different loads. It is found that these numbers increase with increase in load. The Mayer’s index (n) was found to be greater than 1.6 predicting soft-material natures. The fracture toughness value (KC), was determined from measurements of crack length. The brittleness indices (Bi) were found for the grown crystals. Using Wooster’s empirical relation, the elastic stiffness constant (C11) was calculated from Vickers hardness values at different loads. Young’s modulus was also calculated from Knoop microhardness values..

Keywords

Microhardness number, Mayer’s index, Fracture toughness, Brittleness indices, Elastic stiffness coefficient, Young’s modulus.

Citation

S. SURESH, Mechanical properties of meta-nitroaniline NLO single crystals, Optoelectronics and Advanced Materials - Rapid Communications, 6, 11-12, November-December 2012, pp.1174-1177 (2012).

Submitted at: July 13, 2012

Accepted at: Oct. 30, 2012