Abstract
The Vickers and Knoop microhardness studies were carried out on the (001) face of 4-Dimethylamino- N-methyl 4-Stilbazolium Tosylate (DAST) crystals grown by the slope nucleation technique. The Vickers microhardness number ( H v) and the Knoop microhardness number ( H k) were found to dwindle with increasing load. The Meyer's index number ( n) and hardness were calculated from H v. The fracture toughness, brittle index and yield strength were calculated. The Young's modulus was calculated using the Knoop hardness value.
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