Thallium-free precursors for bulk superconductors with the overall composition (Tl0.5Pb0.5)(Sr1-xBax)2(Ca1-yGdy)Cu2Oz (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25, y = 0.0, 0.05, 0.1, 0.2, 0.3, 0.4) were prepared via wet chemical gel techniques. The respective amounts of Tl2O3, PbO and Gd2O3 were co-milled to the precursor and the mixture was subjected to a heat treatment first at 850 °C followed by sintering at 925 °C in order to optimize the superconducting properties of the bulk material. X-ray diffraction showed that samples with x and y equal to or smaller than 0.2 were nearly phase-pure. While changes in the x value had little effect on the properties of the materials, a Gd stoichiometry of 0.2 yielded the best results in this series. Critical temperatures around 100 K were obtained for samples with the composition (Tl0.5Pb0.5)(Sr1-xBax)2Ca0.8Gd0.2)Cu2Oz
Sprache der Kurzfassung:
Englisch
Englische Kurzfassung:
Thallium-free precursors for bulk superconductors with the overall composition (Tl0.5Pb0.5)(Sr1-xBax)2(Ca1-yGdy)Cu2Oz (x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25, y = 0.0, 0.05, 0.1, 0.2, 0.3, 0.4) were prepared via wet chemical gel techniques. The respective amounts of Tl2O3, PbO and Gd2O3 were co-milled to the precursor and the mixture was subjected to a heat treatment first at 850 °C followed by sintering at 925 °C in order to optimize the superconducting properties of the bulk material. X-ray diffraction showed that samples with x and y equal to or smaller than 0.2 were nearly phase-pure. While changes in the x value had little effect on the properties of the materials, a Gd stoichiometry of 0.2 yielded the best results in this series. Critical temperatures around 100 K were obtained for samples with the composition (Tl0.5Pb0.5)(Sr1-xBax)2Ca0.8Gd0.2)Cu2Oz
Journal:
Journal of Physics: Conference Series
Volume:
43
Seitenreferenz:
462 - 465
Erscheinungsjahr:
2006
ISSN:
1742-6596
Anzahl der Seiten:
4
Notiz zur Publikation:
(Tl0.5Pb0.5)(Sr1-xBax)2(Ca1-yGdy)Cu2Oz 1212 Superconductors
G Gritzner, H Sudra and M Eder
J. Phys.: Conf. Ser. 43 (2006) 462 – 465
Reichweite:
international
Publikationstyp:
Aufsatz / Paper in sonstiger referierter Fachzeitschrift
Forschungs-