Verification and Application of Modified Kick's Law to Rhombohedral Crystals: Sodium Nitrate

✍ Scribed by Dr. D. R. Joshi; J. R. Pandya

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 265 KB
• Volume: 27
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170270711

✦ Synopsis

Abstract

Optical 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 = ad^n^) and also on modified KICK's Law {(P — W) = bd^2^} 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.