Crystal growth of MgB2 from Mg-Cu-B melt flux and superconducting properties

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dc.creatorSouptel, D.
dc.creatorBehr, G.
dc.creatorLoser, W.
dc.creatorKopylov, W.
dc.creatorZinkevich, M.
dc.date2002-08-15
dc.date.accessioned2026-07-07T02:46:51Z
dc.date.available2026-07-07T02:46:51Z
dc.descriptionA new method for preparation of single crystals of the superconducting intermetallic MgB2 compound from a Mg-Cu-B melt flux is presented. The high vapour pressure of Mg at elevated temperature is a serious challenge of the preparation process. The approximate thermodynamic calculations of the ternary Mg-Cu-B phase diagram show a beneficial effect of Cu, which extends the range of formation of MgB2 to lower temperatures. Within the as-solidified Mg-Cu-B melt flux the MgB2 compound forms plate-like single crystals up to a size of 0.2 x 0.2 x 0.05 mm3 or alternatively rims peritectically grown around MgB4 particles. AC-susceptibility measurements were conducted with specimen selected from different parts of the as-solidified flux containing MgB2 particles. Peritectically formed MgB2-particles display the highest transition temperature of Tc = 39.2 K and a relatively narrow transition width of DTc = 1.3 K. Other sections of the sample exhibit various superconducting transitions from Tc = 39 K to 7.2 K. This variation of Tc is attributed to a finite homogeneity range of the MgB2 compound whereas significant Cu solid solubility in MgB2 can be excluded.
dc.description22 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0208300
dc.identifierhttp://arxiv.org/abs/cond-mat/0208300
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19789
dc.subjectSuperconductivity
dc.subjectMaterials Science
dc.titleCrystal growth of MgB2 from Mg-Cu-B melt flux and superconducting properties
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