Abstract
A series of La2CuO4+δ samples chemically oxidized at50 °C with different oxidation times using NaClO as the oxidizingagent have been prepared. All the oxidized samples are single-phase bulksuperconductors with an onset transition temperature at 42-45 K measuredby dc magnetic susceptibility. X-ray powder diffraction indicates that allthe oxidized samples are orthorhombic, and show an enhanced orthorhombicdistortion with the oxidation time, compared with that of the startingmaterial. The excess oxygen contents of the oxidized samples determined byiodometric titration are large and increase with the oxidation time. Thefit to the experimental data reveals that the excess oxygen content versusthe oxidation time obeys the law of the second-order exponential decay. Noobvious changes in the grains of the samples before and after oxidationhave been observed by scanning electron microscopy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
