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IJPAP Vol.46(06) [June 2008] >


Title: Superconductivity in Mg1-xMxB2 (M = Cu and Ag) system
Authors: Singh, Kiran
Mohan, Rajneesh
Shelke, Vilas
Gaur, N K
Singh, R K
Keywords: Superconductivity
Doping
Critical temperature
Issue Date: Jun-2008
Publisher: CSIR
Abstract: The polycrystalline samples with nominal compositions Mg1-xMxB2 (M = Cu, Ag; x = 0, 0.05) have been synthesized through solid-state reaction method. All the samples were synthesized from the stoichiometric mixtures of Mg, B, Cu and Ag. The samples were sintered at 850°C for 2 h in the presence of high purity argon flow. The X-ray diffraction (XRD), R-T measurement and scanning electron microscopy (SEM) techniques have been used for the characterization of samples for phase formation, superconducting transition temperature (Tc) and microstructure, respectively. It is noticed from the XRD patterns that the Cu and Ag doping leads to the formation of Mg-Cu and Mg-Ag alloys as the secondary phase, respectively along with the major phase of MgB2. In case of Cu doping Tc decreases slightly and Ag doping has no effect on it. The grain size remains the same with these dopings, but the grain connectivity improves.
Page(s): 420-422
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.46(06) [June 2008]

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