CARBON INFLUENCE IN THE SYNTHESIS OF MgB2 BY A MICROWAVE METHOD

Author:

AGOSTINO A.1,BONOMETTI E.1,VOLPE P.1,TRUCCATO M.2,MANFREDOTTI C.2,OLIVERO P.2,PAOLINI C.2,RINAUDO G.2,GOZZELINO L.3

Affiliation:

1. Dipartimento di Chimica Generale ed Organica Applicata, C.so Massimo D'Azeglio 48, I-10125 Torino, Italy

2. Dipartimento di Fisica Sperimentale, INFN and INFM-UdR Torino Università, Via P.Giuria 1, I-10125 Torino, Italy

3. Dipartimento di Fisica, INFN and INFM-UdR Torino Politecnico, C.so Duca degli Abruzzi 24, I-10129 Torino, Italy

Abstract

We describe a method to produce MgB 2 bulk via a microwave processing, which has not been reported yet for this material. We used two experimental arrangements, which were different in the form of the graphite thermal activator responsible for the microwave absorption. The reaction products have been analyzed from the morphological, structural and electronic point of view. The results show that the critical temperature is decreased by about 4 K when the graphite can diffuse inside the reaction cell and is incorporated in the samples, even if no evidence of carbon substitution in the MgB 2 lattice is given by the lattice constants. We point out that excellent conductivity features are achieved for nearly carbon-free samples.

Publisher

World Scientific Pub Co Pte Lt

Subject

Condensed Matter Physics,Statistical and Nonlinear Physics

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