Abstract:4-Dimethylamino-N-methyl 4-Stilbazolium Tosylate(DAST) crystals were prepared by the slope nucleation method. The Vickers hardness of DAST crystal was studied on (001) and (110) faces. It was found that the Vickers hardness increases with increasing load and theHvon (001) face is higher than that on (110) face. The values of Meyer’s index numbernand hardness were calculated fromHv. The results showed that the DAST crystals belong to the soft material category.
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