The mixed and impurity added crystals of alkali halides are found to be harden than the end members and so they are more useful. So, it is necessary and useful to prepare binary and ternary mixed crystals of alkali halides and characterize them by measuring their physical properties. In the present work, we have grown NaxK1-xCl crystals for various values of x by slow evaporation method. Vicker’s microhardness was measured for all the grown crystals. The results show that these mixed crystals belong to the hard category of materials. Details are presented
