Surface Energy of {100} Potassium Chloride
- 1 October 1963
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 34 (10) , 3085-3089
- https://doi.org/10.1063/1.1729125
Abstract
A modified Obreimov‐Gilman cleavage technique utilizing the apparent variation of cleavage surface energy with crack length and specimen dimensions has been used to determine the true surface energy γ0 of the {100} planes of potassium chloride at room temperature. γ0 {100} KCl was found to be 110±5 ergs/cm2, in good agreement with Born and Stern's theoretical estimate of γ0 (108 ergs/cm2) but not with more recent estimates of this quantity (160–185 ergs/cm2). Possible causes for this discrepancy are discussed. Other experiments revealed that the presence of a solvent environment at the crack tip increased the cleavage fracture energy only some two or three times. This suggests that the Gurney‐Pulliam phenomenon of precipitation at a crack tip is not primarily responsible for the increased strength and ductility of ionic crystals tested in solvent environments (Joffe's effect).This publication has 21 references indexed in Scilit:
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