Formation Process of YBCO Superconducting Phase by Metal Organic Deposition: Formation of YBCO Superconducting Phase

Abstract

This paper investigates the thermal decomposition and synthetic reaction kinetics of superconducting material and provides the reference data for the production process of high-temperature superconducting tapes. First, a precursor solution was prepared as acetate of components of YBa2Cu3O7-δ(YBCO) material and various thermal analyses were performed using the powders obtained by drying and grinding processes. Then, the synthesis mechanism of YBCO superconducting phase and the kinetic parameters were obtained using the universal differential, integral and multi-rate scanning Kissinger methods. The results showed that the thermal decomposition was divided into four stages characterized by weight loss from 25°C to 900°C. The fourth stage for the synthesis reaction of YBCO phase follows the random nucleation and subsequent growth (n = 2) model; the activation energy and pre-exponential factor of the fourth stage were 222 kJ/mol and $2.34 \times 10^{10}/\min$, respectively. In terms of reaction mechanism and kinetic parameters, the kinetic equation expressing the formation process of YBCO superconducting phase was obtained.