Electrical and Microstructural Properties of Superconducting MgB<sub>2</sub>/Mg Composites
2004; Trans Tech Publications; Volume: 264-268; Linguagem: Inglês
10.4028/www.scientific.net/kem.264-268.1197
ISSN1662-9809
AutoresM. Egilmez, A. Gunel, Salih Okur, Metin Tanoğlu, L. Özyüzer,
Tópico(s)Thermal Expansion and Ionic Conductivity
ResumoMgB 2 /Mg composites were prepared to improve mechanical properties of brittle superconducting MgB 2 .MgB 2 and Mg powders were mixed at different weight ratios and uniaxially pressed in a cylindrical dye at 0.5 GPa and at various temperatures for two hours to prepare MgB 2 /Mg composites.X-ray diffraction, SEM and EDX were used for phase identification and microstructural characterization.In addition to the main MgB 2 and Mg phases, the microstructural studies have indicated the presence of a minor amounts of second phases, namely MgO and B-rich compounds.The surface morphology, grain size and porosity ratio of the samples prepared under various temperatures were also investigated.The resistivity measurements were performed in the range of room temperature to 15 K.The effect of excess Mg and secondary phases on critical temperature of MgB 2 /Mg composites were studied.
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