Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.6: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Carbon Doping as an Effective Way to Enhance the Superconducting Properties of Mechanically alloyed in-situ MgB2 — •Marko Herrmann1, Wolfgang Häßler1, Juliane Scheiter1, Christian Rodig1, Margitta Schubert1, Ania Kario1, Christine Mickel1, Nadezda Kozlova1, Konstantin Nenkov1, Manfred Ritschel1, Wolfgang Gruner1, Ludwig Schultz1,2, and Bernhard Holzapfel1,2 — 1Leibniz Institute for Solid State and Materials Research (IFW) Dresden, P.O.Box 270116, 01171 Dresden, Germany — 2Dresden University of Technology, Department of Physics, 01062 Dresden, Germany
Up to now, carbon doping is the only reliable way to enhance the superconducting properties of Mg2 significantly. Due to the substitution of carbon on boron sites of the lattice, increased impurity scattering results in an enhanced upper critical field. Subsequently, an improved high field jc-performance of carbon-doped MgB2 is observed. Among the plethora of carbon-containing compounds studied so far, nanostructured carbon and carbon nanotubes (CNT) are potentially the most promising materials. Especially the elongated microstructural features of CNTs may additionally function as artificial pinning centers. In this work, the impact different carbon sources has on the structural and superconducting properties of nanocrystalline MgB2 bulk samples and tapes is discussed. Precursor powders of carbon-doped MgB2 were produced by mechanical alloying. In order to preserve the microstructural features of the CNTs, the standard processing procedure was modified.