Dislocation Structure around Indentation in Barium Fluoride Crystals

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Abstract
Synthetic barium fluoride single crystals have been indented and the rosettes revealed by etching around the indentation have been studied. The rosette arms which consist of rows of pits are made up of two triangular patterns, oriented opposite to each other and superposed. By alternately polishing and re-etching the same surface, it is observed that the size of the triangular patterns forming the rosette, and the density of pits in the rosette arms, change. It is conjectured that the pits in the rosette arms are formed at the emergence of dislocation half loops. The change in the sizes of the two triangular patterns with the corresponding thickness polished, have been measured. The calculated inclination of the plane in which the dislocation half loops lie with the (111) surface of observation comes out to be approximately 70°. It may, therefore, be conjectured that the dislocation half loops lie in {111} cleavage planes. The implications are discussed.

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