Problems of YBa2Cu3Ox formation and decomposition kinetics and mechanism

The kinetics and mechanism of YBa2Cu3Ox formation is reconsidered on the basis of literature data and our own data which have shown that their detailed solution from TA measurements alone is not feasible. Curves indicating morphological and chemical reactivity aspects are presented, diffusion and possibly two-dimensional nucleation being largely responsible for HTSC formation. The oxygen intake is also controlled by diffusion, and can strongly affect the high-temperature superconducting properties of the grain surface layer. The formation of intermediate superstructures is particularily noteworthy.