Abstract
AbstractOptical study of mechanical response indicated by Knoop indentation of cleavage faces of synthetic sodium nitrate crystal based on MEYER's Law/KICK's Law (P = adn) and also on modified KICK's Law {(P — W) = bd2} expressing relations between applied load P and diagonal length d is made. The Newtonian resistance pressure W is finite and positive. The value of standard hardness (a and b), exponent n are calculated. It is found that W and b are almost contant and independent of thermal treatment and of the indenter orientation with respect to direction [100] on cleavage plane (100) of sodium nitrate crystals. Since they are independent of indenter orientations, they are not associated with crystal anisotropy.
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