The goal of this paper is to investigate the phase transformations of thin multi-layer structures from High Temperature Superconductor - YBa2Cu3O7-? and manganate – La0.7Sr0.3MnO3 (LSMO, both deposited on different substrates by means of real-time synchrotron X-ray scattering. The phase formations and phase interaction process were in situ examined in oxygen atmosphere and high temperature. The latter was only possible using SR at Rossendorf Beam Line (ROBL), because the process demands short measuring times in order to follow the process adequately. The temperature ranges of the superconducting phases were also described analyzing the lattice parameter and the peak evolutions. The formation of new unexpected phases was registered. We established the general temperature range of the superconducting YBCO phase formation. To attain this purpose a special vacuum chamber was constructed to fit the goniometer and to work in oxygen atmosphere at elevated temperatures.
