Thermal decomposition of precursor of SmBiO3 buffer layer for YBCO high-temperature superconducting tape

In order to explore the rapid preparation process of the buffer layer of the high-temperature superconducting tape, the thermal decomposition and the phase formation kinetics of buffer layer precursor were studied. The precursor solution was prepared by using lactic acid as solvent, and nitrates as solutes. The synthesis mechanism of SmBiO₃ phase was determined by the combination of universal integral method, differential method and multi-rate scanning Kissinger method, and the related kinetic parameters were solved. The results show that the thermal decomposition processes of the precursor is divided into two stages from room temperature to 800 °C. The second stage of SmBiO₃ phase synthesis reaction obeys the second order chemical reaction model. The average apparent activation energy and the pre-exponential factor of the synthesis reaction calculated by the integration and the differential methods are 73 kJ/mol and 3.24 × 10⁴/min, respectively.