Phases Y2BaCuO5 and YBa2Cu3O7 belong to the system Y-Ba-Cu-O, which is well-known for unique high-temperature superconducting properties. In this contribution, we have studied in detail the Y2BaCuO5 phase, also known as a ‘green phase’ or ‘Y-211’, which is usually an accompanying phase in YBCO superconducting bulks. Morphology and chemical composition were studied using energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). Lattice parameters were refined by Rietveld analysis based on obtained XRD data. Simultaneous thermal analysis was employed to study thermal stability. The heat capacity and enthalpy increments were measured by physical property measurement system (PPMS) and drop calorimetry. Such data are of utmost importance for the phase equilibria study of the Y-Ba-Cu-O system and further improvement of bulk properties of HTS superconductors.

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