Vicker's Microhardness Study of 1, 3 Dimethyl Urea Doped Amino Acid-Based L-Asparagine Monohydrate Single Crystals

Abstract: The effect of 1, 3 dimethyl urea on optical and mechanical properties of L-asparagine monohydrate single crystal has been investigated in the present study. Optical studies on grown crystals show decrease in absorbance and increase in energy band gap of doped crystals. From the mechanical study it has been seen that the Vicker’s hardness number increases with applied load that confirm the Reverse Sized Indentation Effect (RISE). All the grown crystals belong to the soft category. The value of stiffness constant found to be high in doped crystals at higher load. It shows the presence of strong atomic binding force between the atoms. Increase in yield strength with applied load indicates the elastic nature of material. RISE pattern of grown crystals has been validated by Hay’s and Kendall model.