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Abstract

Micro-Structural Properties Of Te+4-Doped Mg1-XTexB2 Superconductor Regime

Author(s): Khaled M.Elsabawy

The pure and tellurium-doped samples having formula Mg1-xTexB2 (where, x =0.0, 0.05, 0.1 and 0.2 mole) were prepared via high temperature solid state reaction route .The synthesis was depending upon diffusion mechanism of both Mg- and Te-vapours through boron-matrix. The solubility limits of tellurium were found to be too tide to substitute higher than 0.2mole on Mg-sites. X-ray diffraction analysis for investigated samples proved that all samples were found mainly belong to single hexagonal phase with P6/mmm symmetry with very small traces from MgO and TeO2 as secondary phases in minor. From SE-microscopy and EDX analyses only MgO was detected in between grains and no existence for any aggregations of expected TeO2 secondary phase. Magnetic susceptibility measurements indicated that only the sample with maximum thrium doping ratio x = 0.2 mole exhibited slight depression on its value of Tcoffset which found to be 35.1 K. ï›™ 2006 Trade Science Inc. - INDIA


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