Abstract
Y2BaCuO5 often occurs as an accompanying phase of the well-known high-temperature superconductor YBa2Cu3O7 (also known as YBCO). Y2BaCuO5, easily identifiable due to its characteristic green coloration, is often referred to as ‘green phase’ or ‘Y-211’. In this contribution, Y2BaCuO5 phase was studied in detail with a focus on its thermal and thermodynamic properties. Energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and scanning electron microscopy (SEM) were employed in the study of sample’s morphology and chemical composition. XRD data were further analyzed and lattice parameters refined by Rietveld analysis. Simultaneous thermal analysis was employed to study thermal stability. Particle size distribution was analyzed by laser diffraction. Finally, thermodynamic properties, namely heat capacity and relative enthalpy, were measured by drop calorimetry, differential scanning calorimetry (DSC), and physical properties measurement system (PPMS). Enthalpy of formation was assessed from ab-initio DFT calculations.
Highlights
Transition metal (TM) oxides constitute a large family of oxides, which possess a variety of interesting properties [1,2,3,4]
The goal of this paper is to study Y2 BaCuO5 phase that is present in single-domain YBa2 Cu3 O7-δ (YBCO) superconductors in a form of pinning centers
No visible impurities were detected by X-ray diffraction, only the presence of the Y-211 phase (Y2 BaCuO5 )
Summary
Transition metal (TM) oxides constitute a large family of oxides, which possess a variety of interesting properties [1,2,3,4]. Cobalt mixed oxides with misfit structure are thermoelectric materials for the recovery of waste heat, and misfit cobaltites show unique catalytic properties [5,6,7]. Among TM oxides, the high-temperature superconductors (HTS) revealing critical temperature close to the temperature of liquid nitrogen have been attracting permanent attention since their discovery in 1986 [14]. Enhanced critical temperatures and intriguing superconducting behavior have been later reported in several systems, for example in layered ternary and quaternary arsenide systems [15,16], the HTS cuprates became the most wide-spread group of high-temperature superconductors, still being at the forefront of both theoretical and applied research in the field of superconductivity
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