Investigations of (Bi/Pb)-Sr-Ca-Cu-O-based superconductors by EDS analysis
| Autor: | A Sever, A Ceh, M Hrovat, D Kolar, S Bernik |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Superconductivity
Materials science Transition temperature Metals and Alloys Analytical chemistry Condensed Matter Physics Microstructure Electrical resistivity and conductivity Phase (matter) visual_art Volume fraction Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Electrical and Electronic Engineering Solid solution |
| Zdroj: | Superconductor Science and Technology. 7:19-23 |
| ISSN: | 1361-6668 0953-2048 |
| Popis: | Superconducting ceramic materials with a nominal composition Bi1.75Pb0.25Sr2Ca2.05Cu3.05Ox were synthesized. Tc (R=0) was 60 K (extrapolated), 105 K and 110 K for samples fired at 800 degrees C, 845 degrees C and 855 degrees C respectively. Fractured and polished surfaces were investigated by energy dispersive X-ray spectroscopy (EDS) using a standardless ZAF method and a ZAF method with standards. The volume fraction of the superconducting phase increased with increasing firing temperature. The non-superconducting phases identified in samples fired at 800 degrees C were Ca2CuO3, (Sr,Ca)Cu2O3, Ca2PbO4 and unreacted CuO. After higher firing temperatures only Ca2CuO3 and (Sr,Ca)Cu2O3 remained. The EDS results slowed that the composition of the high-Tc phase differed from the 'ideal' 2223 (Bi0.66Sr0.66Ca0.66CuOx) composition which was attributed to the formation of solid solutions between the low-Tc and the high-Tc phases. |
| Databáze: | OpenAIRE |
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