ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Samples of the superconducting ceramics Hg0.82Re0.18Ba2Ca2Cu3O8+ were prepared bysolid-vapor reaction technique. The preparation of the ceramic precursor started with a mixture ofBa2Ca2Cu3Ox and ReO2 powders with molar ratio 1:0.18. The precursor material was submitted toannealing under three different partial pressures of oxygen using a mixture of oxygen/argon atratios: 5/95 (sample A), 10/90 (sample B) and 15/85 (sample C). X-ray powder diffraction analysisof the precursors identified the phases BaCuO2+x, Ba2Cu3O5+x, Ba4CaCu3O8+x, Ca2CuO3 andCa5Re2O12 at different ratios in the samples, indicating an increment in the oxygen content fromsample A to sample C. Finally, the precursors with different oxygen contents were blended withHgO at molar ratio 1:0.82 and treated in a sealed high pressure furnace to produce the high Tcsuperconducting ceramics. Rietveld refinement of XRD data showed differences in the crystalstructures of the samples. The measurement of thermopower at room temperature resulted in distinctvalues, confirming the different oxygen sample doping
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.591-593.392.pdf