Abstract
The phase transformation of high-Tc superconductors RE1 Ba2Cu3O7−δ (where RE = yttrium, neodymium, europium, gadolinium, erbium, holmium) was studied using differential scanning calorimetry (DSC). DSC traces between room temperature and 650° C reveal a peak in all the single-phase samples studied, indicating the phase transforms from an orthorhombic to tetragonal structure. The kinetics of phase transformation of these superconductors is shown to follow the Kissinger law and the determined activation energies are between 1.6 to 2.5 eV. The lattice parameters of these superconductors in either orthorhombic or tetragonal phase are also determined. It was found that DSC is more sensitive in detecting small amounts of residual, unreacted oxides in high-Tc superconducting samples than X-ray diffraction technique.
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