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Published online by Cambridge University Press: 22 February 2011
Fracture of iron-doped silicon has been studied using HREM. Fractures were introduced into cross section specimens of oxidized silicon using microhardness indents. A crack is extended using thermal stresses generated by the electron beam. The tip of the advancing crack is made up of two or more parallel sub-cracks. As the crack grows, one of these sub-cracks appears to dominate while the multiple crack front still exists at the tip. Also shear strain has been seen across the crack interface. The process appears to be much more complicated that existing models suggest.