Physics – Condensed Matter – Superconductivity
Scientific paper
2002-11-06
Physics
Condensed Matter
Superconductivity
11 pages text, 4 pages Figs. To ISS 2002 YOKOHAMA for PHYSICA C
Scientific paper
10.1016/S0921-4534(03)01067-0
Here we report the results of thermogravimetric (TG) analysis on the oxygen non-stoichiometry of RuSr2GdCu2O8 (Ru-1212) and RuSr2(Gd0.75Ce0.25)2Cu2O10(Ru-1222) samples. With TG annealings carried out in O2 and Ar atmospheres it was found that the oxygen content in Ru-1212 remains less affected upon various annealings, while for Ru-1222 wider-range oxygen-content tuning is possible. When heated in H2/Ar atmosphere the both phases release oxygen upon breaking down to mixtures of metals (Ru and Cu) and binary oxides (CeO2, Gd2O3, and SrO) in two distinct steps around 300 and 450 oC. This reductive decomposition reaction carried out in a thermobalance was utilized in precise oxygen content determination for these phases. It was found that the 100-atm O2-annealed Ru-1212 sample was nearly stoichiometric, while the similarly treated Ru-1222 sample was clearly oxygen deficient. X-ray absorption near-edge (XANES) spectroscopy was applied to estimate the valence of Ru in the samples. In spite of the fact that the Ru-1212 phase was shown to possess less oxygen-deficient RuO2 layer, the valence of Ru as probed with XANES was found to be lower in Ru-1212 than that in Ru-1222.
Awana* V. P. S.
Jang L.-Y.
Karppinen Maarit
Liu R.-S.
Matvejeff M.
No associations
LandOfFree
Oxygen non-stoichiometry in Ru-1212 and Ru-1222 magnetosuperconductors does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Oxygen non-stoichiometry in Ru-1212 and Ru-1222 magnetosuperconductors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen non-stoichiometry in Ru-1212 and Ru-1222 magnetosuperconductors will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-448064