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Thermodynamic and pseudo binary phase diagram of REBa2Cu3O7-x – ”Ba2Cu5O7” systems (RE=Nd, Sm, Eu). The effect of oxygen pressure
No full textIn this work the effect of oxygen pressure on the primary crystallisation fields for REBa2Cu3O7–x (RE=Nd, Sm, and Eu) has been studied. A DTA apparatus has been modified in order to carry out analyses under gas pressure, so the trend of temperatures of peritectic decomposition of the
REBa2Cu3O7–x phases and of the eutectic equilibrium involving REBa2Cu3O7–x phases and flux mixture
‘Ba2Cu5O7’ have been studied at oxygen pressures of 0.21, 1, and 10 atm. This showed that primary crystallisation fields spread at the increase of the oxygen pressure and allowed us to calculate the enthalpies of reactions of REBa2Cu3O7–x phases too
Single crystals growth and phase diagram studies in the RBa2Cu3O7-x systems (R = Y and Rare Earths)
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New candidate for superconductors: a series of layered tetragonal pnictide oxides M4Pn2= (M=Ca, Sr, Ba and Pn= As, Sb, Bi)
No full textElectrochemical investigation of oxygen intercalation into La2CuO4 phases
No full textIn this work the electrochemical intercalation of oxygen in La2CuO4 phases has been studied. Oxygen intercalation has been performed at different anodic potentials for fixed time in alkaline solution (1 M NaOH) at room temperature. The electrochemis- try of the phenomena taking place at the oxide—solution interface has been investigated by cyclic voltammetry (CV), controlled- potential coulometry, and electrochemical impedance spectro- scopy (EIS). The homogeneity of processed samples and the lattice parameters prior to and after oxygen intercalation have been verified by X-ray powder diffraction. SEM has been used to relate surface modification to the potential applied after electro- chemical oxygen intercalation. The recent theories and know- ledge of mechanisms of oxygen intercalation into the oxide lattice have been related to the experimental results. Oxygen intercalation seems to occur at potentials slightly lower than that of the oxygen evolution reaction (OER) and proceeds on a paral- lel pathway to O2 evolution at more anodic potentials.In this work the electrochemical intercalation of oxygen in La2CuO4 phases has been studied, Oxygen intercalation has been performed at different anodic potentials for fixed time in alkaline solution (1 MNaOH) at room temperature. The electrochemistry of the phenomena taking place at the oxide-solution interface has been investigated by cyclic voltammetry (CV), controlled-potential coulometry, and electrochemical impedance spectroscopy (EIS), The homogeneity of processed samples and the lattice parameters prior to and after oxygen intercalation have been verified by X-ray powder diffraction, SEM has been used to relate surface modification to the potential applied after electrochemical oxygen intercalation, The recent theories and knowledge of mechanisms of oxygen intercalation into the oxide lattice have been related to the experimental results. Oxygen intercalation seems to occur at potentials slightly lower than that of the oxygen evolution reaction (OER) and proceeds on a parallel pathway to O-2 evolution at more anodic potentials, 1999 Academic Press
Electrochemical oxidation of La2CuO4+d phases in concentrated alkaline solution
No full textElectrochemical doping of La2CuO3 phase has been performed at different anodic potentials for fixed time in alkaline solution (1M NaOH) at room temperature. The homogeneity of processed samples and the lattice parameters prior to and after oxygen have been verified by X.ray powder diffraction. SEM microscopy has been used to relate surface modification to the potential applied after electrochemical oxygen intercalation. The electrochemistry of the phenomena taking place at the oxide/solution interface has been investigated using cyclic voltammetry (CV) and controlled potential coulometry (CPC
Electrochemical properties and hydrogen absorption-desorption isotherms of the HoPt phase
No full textSearch for new superconductive oxides in M4Pn2O phases ( M = Ca, Sr, Ba and Pn = As, Sb, Bi)
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