An ordered structure of Cu3Sn in Cu–Sn alloy investigated by transmission electron microscopy

Cu3Sn phase with the D019 structure is observed in Cu–Sn alloy by transmission electron microscopy. The structure is determined by electron diffraction, high-resolution transmission electron microscopy and high-angle annular dark-field imaging techniques. To the best of our knowledge this structure has not been reported before in Cu3Sn compounds. Transmission electron microscopy revealed high-density antiphase boundaries lying on the {0 1¯ 1 0} planes with translation vectors of (a/2)〈2¯ 1 1 0〉 in the D019 Cu3Sn.