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:
Bulk samples with the stoichiometry of Mg:B=1:2 and 1:4 were prepared by solid statereaction method. The microstructure and constituent of the samples were investigated by using thescanning electron microscope (SEM) and the x-ray diffraction (XRD). XRD results showed that theMgB2 phase was first formed in all the samples with different stoichiometry of Mg and B, whichindicated that the MgB2 was the most thermodynamically stable phase in the Mg-B binary system. Forthe samples of Mg:B=1:2, the MgB2 single phase was formed very well when these samples weresintered at 650℃~700℃. For the samples with later added Mg reaching to the stoichiometry ofMg:B=1:2, a longer reaction time or higher reaction temperature was required for the formation of theMgB2 single phase. The SEM results showed that the samples with later added Mg had densemicrostructures, suggesting that the later addition of Mg could reduce the porosity of the sample. Asmall increase of the superconducting transition temperature, Tc, in the Mg addition sample resultedfrom the dense microstructures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2035.pdf
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