Abstract
Recent transmission electron microscopy (TEM) experiments have shown that the transformation of the Bi cuprate 2212 phase to 2223 phase consists of random intercalation and fast growth of Ca/CuO/sub 2/ planes in the Bi-2212 matrix. This contradicts the prediction of the conventional nucleation and growth theory. A model is proposed which considers the cylindrical void created by the edge dislocation due to the insertion of a Ca/CuO/sub 2/ plane to be a channel for fast ion diffusion. The experimentally observed time dependence of the volume fraction of Bi-2223 during the transformation is found to be consistent with a one-dimensional diffusion-controlled transformation mechanism, as predicted by our model. The formation energy of Bi-2223 is estimated and is consistent with the results of atomistic simulations.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call