Abstract
Powdered samples of polycrystalline Nb 3Sn superconductor filaments with cubic A 15-structure have been investigated by high resolution electron microscopy (HREM). Structure images representing the projected electric potential of the structure in the (001)- plane are presented. The constrast pattern shows the position of the individual chains of Nb-atoms arranged parallel to the electron beam. This pattern is compared with the contrast calculated on the basis of the dynamical theory of electron diffraction by the multislice method. The observed contrast agrees with the calculated pattern. A structure image made in the [012]-projection containing one dislocation reveals a large region of strain in the crystal lattice surrounding that defect.
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