The structure of grain boundaries between grains of different BSCCO-type phases in BSCCO ceramics is investigated by high-resolution transmission electron microscopy (HRTEM). Regular interphase grain boundary structures are found, and corresponding atomic scale models are derived. The structure of two interphase tilt boundaries, viz. 2212/2201 and 2212/1212, is investigated in detail. The results show that ± ± in analogy to grain boundaries between grains of the same phase ± ± also interphase grain boundaries in high-T c superconducting (HTSC) materials are characterized by a periodic structure providing alternating areas of good and less good conditions for supercurrent flow.
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