The variation in the microhardness of tin-di-iodide (SnI2) and tin-tetra-iodide (SnI4) crystals has been determined using Vicker's microhardness indentor. It is observed that the microhardness of the crystals depends on the applied load and is independent of the duratidn of loading. Viekers Hardness Numerals (VHN) for SnI 2 is found to be greater than that of SnI 4 crystals. Mayer's equation and implications have been discussed.
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