Direct Measurements of the Surface Energies of Crystals
- 1 December 1960
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 31 (12) , 2208-2218
- https://doi.org/10.1063/1.1735524
Abstract
By means of quantitative cleavage experiments, the surface energies of several simple crystals have been measured at −196°C. The crystals and their cleavage planes are: LiF (100), MgO (100), CaF2 (111), BaF2 (111), CaCO3 (1010), Si (111), and Zn (0001). Measured values of their respective surface energies (ergs/cm2) are: 340, 1200, 450, 280, 230, 1240, and 105. The measured values for LiF and MgO are in good agreement with simple ionic lattice theory. Values for the other crystals seem consistent with their binding energies. Under irreversible conditions an effective surface energy is measured. This quantity increases rapidly with increasing temperature for the metallic crystals, Zn and Fe (3% Si). The increase correlates with increasing plastic flow in these crystals. In contrast, the effective surface energy of LiF and MgO is only moderately dependent on temperature. A small amount of cadmium (0.1 at.%) markedly increases the cleavage surface energy of zinc.This publication has 16 references indexed in Scilit:
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